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IMP Installation Guide

1. 2 O O O ba d OKO is Js la OO d oo j d H d u DO y SISI QO Grounding points Figure 12 1 The 35953J Connector Block Six four way PVC rubber boots are provided on the end cap to ensure a weatherproof seal for cable entry Optional single way boots can be fitted instead for larger cables A cable clamping and grounding facility is provided between the b
2. CH7 CH8 CH9 CH 10 CH 11 S S S S S S CH2 CH3 CH4 CH5 CH6 S S S S sa SYNC 4 SYNC 3 SYNC 2 SYNC 1 CH1 S S S S S COMMS OUT e S 12V 5V 5V NC NO COM 12V GND RELAY Fig 10 2 Layout of Connector Block 35953G WARNING To ensure operator safety and to maintain the IP55 Specification regarding the protection against ingress of moisture the 35951G VIMP must always be operated with both 35953G Connector Blocks fitted Once the measurement connections have been made replace the connector block cover and secure with the two securing screws Then insert the connector block into its recess in the VIMP casing and screw in the two knurled screws The knurled screws may be turned initially with the fingers but should finally be tightened with a broad bladed screwdriver 10 6 VIMPs 3595 1F G Connector Block 3595 3G JWS 3595 Installation Guide Issue RN 4 MEASUREMENT PREPARATION This section
3. HHHH Me JUMPERS for channels 17 through 32 10 12 VIMPs 3595 1F G Connector Block 3595 3G JWS 3595 Installation Guide Issue RN 5 2 JWS 3595 Installation Guide Issue RN CONFIGURING THE VIMP JUMPERS VERSION 1 Version 1 of the VIMP jumper layout relates to earlier models of the VIMP The Jumper layout for later models is described in Section 5 3 the two versions are easily distinguishable from each other The jumper locations for version 1 are shown in Figure 10 3 whilst the jumper settings and associated functions are listed in Tables 10 1 through 10 3 To modify the jumper configuration simply plug the jumpers IN or take them OUT as indicated Synch channel jumpers See Table 10 3 Note Jumper groups A through P relate to analog input channels 1 through 16 and 17 through 32 A LK1 A LK2 A LKS B LK1 B LK2 B LK3 C LK1 C LK2 C LK3 D LK1 D LK2 D LK3 E LK1 E LK2 00 ddd ddd ddd ddd ddd ddd dad 3 In each jumper group LK1 selects the analog input coupling Table 10 1 and LK2 LK3 select the analog input gain Table 10 2 The jumper pin configura tion of jumper groups A through P is shown in the detail Each plug in jumper is able to link a pair of adjacent pins pair a or pair b Analog input op tions are selected by plug ging IN jumper a or jumper b or leaving both jumpers OUT
4. sese A 22 Figure A 21 Grounded signal guarding iii A 22 List of Tables Table A 1 Performance Comparison PRTs v Thermocouples iii A 12 Table A 2 Thermocouple Ranges eee esses eese nennen nnne nnne A 16 Table A 3 Common Mode Rejection A A 20 A 2 Measurement Techniques JWS 3595 Installation Guide Issue RA 1 INTRODUCTION This chapter is intended mainly for newcomers to data logging or for those whose data logging experience is limited to making a few simple measurements To give you an idea of what is going on behind the scenes the chapter introduces the simple theory behind the measurement of various physical quantities such as voltage current and resistance It then progresses to more advanced measurements such as strain gauging The intention is to give a clear understanding of all features of the 3595 IMPs so that you can use these to solve your data logging problems The further aim of this chapter is to ensure that your measurement results obtained with a 3595 IMP truly reflect the system being monitored Although an IMP is capable of making extremely accurate measurements it can measure only what is applied to its inputs This chapter instructs you how to use the interference rejection abilities of the IMPs to full advantage Some simple rules are included also which ensure that the signals applied to the input channels are as clean as possible 2 INPUT DA
5. Range Sensitivity Limits of Error 250 1 25mQ 0 03 rdg 6mo 2502 12 5mQ 0 02 rdg 0 01 fs 2 5kQ 0 1250 0 02 rdg 0 01 fs 25kQ 1 250 0 02 rdg 0 04 fs 5ms 4 17ms Integration time Range Sensitivity Limits of Error 250 2 5MQ 0 03 rdg 24mQ 2500 25mQ 0 03 rdg 0 04 fs 2 5kQ 0 250 0 02 rdg 0 04 fs 25kQ 2 50 0 02 rdg 0 04 fs 1 25ms 1 04ms Integration time Range Sensitivity Limits of Error 250 10mQ 0 02 rdg 96m9 2502 100mQ 0 02 rdg 0 16 fs 2 5kQ 1 02 0 02 rdg 0 16 fs 25kQ 109 0 02 rdg 0 16 fs Resistance 3 wire Temperature coefficient lt 0 003 rdg 0 030 per C 20ms 16 67ms Integration time Range Sensitivity Limits of Error 1 5kQ 0 1252 0 02 rdg 0 22 0 017 fs 25kQ 1 250 0 02 rdg 0 20 0 01 fs 5ms 4 17ms Integration time Range Sensitivity Limits of Error 1 5kQ 0 252 0 02 rdg 0 20 0 07 fs 25kQ 2 50 0 02 rdg 0 20 0 04 fs 1 25ms 1 04ms Integration time Range Sensitivity Limits of Error 1 5kQ 12 0 02 rdg 0 22 0 3 fs 25kQ 109 0 02 rdg 0 20 0 16 fs B 6 Specifications for IMPs type 35951H amp J JWS 3595 Installation Guide Issue RN Resistance 2 wire Temperature coefficient 20ms 16 67ms Integration time lt 0 003 rdg 0 50 per C Limits of Error Range Sensitivity 5000 0 1250 25kQ 1 250 0 02 rdg 50Q 0 05 fs 0 02 rdg 500 0 01 fs 5ms 4 17ms Integration time Limit
6. The current drive is supplied through the H and G terminals of the measurement channel Therefore all channels from 1 through 18 can be used for two wire resistance measurements Three wire Resistance Measurement Three wire resistance measurement is sometimes preferred to the four wire method because three core cable is cheaper than four core The results however are less accurate than with the four wire method and have a reduced thermal stability Also for the lead resistances to be effectively nulled the three conductors must be identical The ranges are 1 5kQ 25kQ and autorange On Channels 2 4 6 8 10 12 14 16 and 18 the I terminal is used for the current return To compensate for the resistance of the input connection cables the current drive is applied alternately to the H and L terminals of Channels 1 3 5 7 9 11 13 15 and 17 These are the only channels on which a measurement result is obtained Four wire Resistance Measurement Four wire resistance measurement has greater thermal stability than the three wire method and gives a more accurate measurement The ranges are 250 2500 2 5kQ 25kQ and autorange The wires from the H and L terminals must be connected as close as possible to the body of the unknown resistance The guard connection is not essential as the I terminal provides interference rejection but it is still good practice to use it The current drive is supplied by the I and I terminals on
7. 4l VLK1 VLK2 VLK3 J LK1 J LK2 J LK3 K LK1 K LK2 K LK3 L LK1 L LK2 L LK3 100 ddd dad ddd M LK1 M LK2 M LKS N LK1 N LK2 N LKS O LK1 O LK2 O LKS P LK1 000000 ddd ddd Table 10 1 Analog Input Coupling Options Coupling LK1a LKib a c OUT OUT d c OUT IN ICP IN OUT Table 10 2 Analog Input Gain Options Fig 10 3 Location of jumpers on the VIMP input card 35959552 JUMPER DETAIL Range LK2a LK2b LK3a LK3b 10V IN OUT IN OUT SV IN OUT OUT OUT 2V IN OUT OUT IN 1V OUT OUT N OUT 500mV OUT OUT OUT OUT 200mV OUT OUT OUT IN 100mV OUT IN IN OUT 50mV OUT IN OUT OUT 20mV OUT IN OUT IN VIMPs 3595 1F G Connector Block 3595 3G 10 13 Table 10 3 Synch Channel Coupling Options Synch Input Jumper Coupling Selected 1 LKI For all links LK 1 4 2 LK2 link out a c coupling 3 LK3 link in d c coupling 4 LK4 5 3 CONFIGURING THE VIMP JUMPERS VERSION 2 Version 2 of the VIMP jumper layout relates to later models of the VIMP The jumper layout for earlier models is described in Section 5 2 the two versions are easily distinguishable from each other The locations of the VIMP jumpers for version 2 and the jumper settings are shown in Figure 10 4 For the convenience of the installer the Jumper settings are inscribed on the pcb as shown in the figure details To set up or modify the jumper configuration simply plug the ju
8. a a ie 50 1 Continued on next page JWS 3595 Installation Guide Issue RF Specifications for IMPs type 1A B C D E F G amp 2A B C 3 Interference Rejection 35951A C amp E Specifications are for 1kQ imbalance in Hi and Lo leads 20ms 16 67ms Integration time Normal mode 50 or 60Hz 0 1 nennen nene nnns gt 60dB Effective common mode rejection ee gt 140dB b0 or o0Elz 0 1961 alati ada atea gt 140dB 50 el gt 120dB 5ms 4 17ms 1 25ms 1 04ms Integration times Normal mode 50 or 60Hz 0 1 nennen nnne nns gt 0dB Effective common mode rejection 50 or 60Hz 0 1 i gt 80dB DC Voltage Temperature coefficient of ADC nens lt 0 0015 rdg 0 2uV per C 35953D High Voltage Connector introduces 100uV 0 04 rdg additional error 20ms 16 67ms Integration time Range Full Scale Sensitivity Limits of Error 20mV 22 000 1uV 0 02 rdg 5uV 200mV 220 00 10uV 0 02 rdg 0 01 fs 2V 2 2000 100uV 0 01 rdg 0 01 fs 12V 12 000 1mV 0 05 rdg 0 01 fs 5ms 4 17ms Integration time Range Full Scale Sensitivity Limits of Error 20mV 22 000 2uV 0 0296rdg 20u V 200mV 220 00 20uV 0 02 rdg 0 04 fs 2V 2 2000 200uV 0 01 rdg 0 04 fs 12V 12 000 2 5mV 0 05 rdg 0 04 fs 1 25ms 1 04ms Integration time Range Full Scale Sensitivity Limits of Error 20mV 22 000 8uV 0 0296rdg 80u V 200mV 220 00 80uV 0 02 rdg 0 16 fs 2V 2 2000 800uV 0 01 r
9. 3595 Installation Guide Issue RM Siting and Securing an IMP 3 5 246mm 1mm 232mm 6 5mm Bolt Holes M4 Grounding Stud 300mm 82 2mm pce pm EL E 464 5mm 1mm 59mm Figure 3 3 Location of bolt holes on Universal IMPs type 1H and 1J JWS 3595 Installation Guide Issue RM 3 6 Siting and Securing an IMP INSTALLATION NOTES FOR 1H AND 1J UNIVERSAL IMPS The weight of the unit including the connector block is 2 5kg Before bolting a 1H or 1J IMP to a flat surface remove the rubber feet It is preferable to mount 1H and 1J IMPs in a vertical attitude In a damp environment any excess moisture then tends to drain away from the vulnerable areas where cables enter the IMP Each time the case of a IH or UU IMP is opened from either end a new dessicant bag must be inserted before the case is closed Packs of 10 dessicant bags are available to order product number 359594F If a new desiccant bag is not immediately available it is possible to reactivate the contents as follows open the bag and empty the clay granules onto a suitable tray then place the tray in a low temperature 140 C oven for between 7 and 8 hours finally allow the tray and clay granules to cool in a dry environment before returning the clay granules to the bag and closing it Note however
10. A 22 Measurement Techniques JWS 3595 Installation Guide Issue RA The shield connection shown in Figure A 21 extends the guard circuit to the local ground at the sensor which may or may not be at actual ground potential By allowing the guard to float at the common mode potential the potential of the local ground this guarding arrangement minimizes common mode interference but certain limitations are imposed on ground connections at the IMP e The guard terminal must not be linked to Lo at the IMP or to another ground point e With respect to the IMP s inter channel isolation it is important to ensure that other sensors connected to the same IMP are all at a ground potential which does not exceed the maximum inter channel voltage specified for the IMP Note that the IMP to IMP isolation is gt 500V Therefore grounded sensor connections on one IMP should not effect other IMPs on the same network JWS 3595 Installation Guide Issue RA Measurement Techniques A 23 5 EFFECT OF PARALLEL INSTRUMENTATION It is sometimes required for IMP input channels to be connected in parallel with those of other instruments typically when measuring thermocouples The purpose of this section is to remind the reader of the effect of this and to offer some broad guidelines Voltage inputs only are considered If a 4 20mA transmitter is to be monitored by two instruments IMPs or otherwise the error imposed by the additional circuit is neglig
11. Channel Channel 2 Channel 1 4 Inside connector block lt Outside connector block gt Fig 6 16 Quarter bridge measurement connections with local dummy 4 LED DISPLAY Four LEDs visible at the end face of the IMP convey certain user confidence information when illuminated They are allocated as shown in Table 6 1 Table 6 1 Meaning of the LED Display LED Meaning Comment 1 Power on O K 2 Calibration error Re calibrate IMP 3 ADC error Have IMP checked out S IMP scanning i e active O K 6 16 IMPs 3595 1B Connector Blocks 3595 3B CSB 3595 Installation Guide Issue QF IMP 3595 1D Connector Block 3595 3E also covers IMC 3595 51D and Connector Block 3595 53E Contents 1 Introduction oi ose etat ett a bec teen Logg bett p a 7 3 2 Internal ee UE Lt e LEET 7 4 3 Default Output Values and Minimum Current cece eeeeeeseeeeeeeeeeeaees 7 5 4 Output Connections i 7 7 4 1 Voltage Connections eene enne nennen nennt enne nnns enters 7 7 4 2 Current Connections ccena e ce eene ERR ut e Eee ke ne da nace 7 7 5 Power and Cabling Considerations ene 7 9 6 ed BIsplay tegen 7 9 List of Figures Figure 7 1 Basic circuit of the output stage of an analog output channel iii 7 3 Figure 7 2 Internal organisation schematic of the 35951D sssssssssssssseeeee 7 4 Figure 7 3 Location of split pad
12. For the 35951C and 35951E IMPs only where voltages larger than 10V are to be measured the 35953D connector block with built in attenuators is required 35953D also has three connections per channel HA Hi Attenuated HP Hi P and L Lo A Guard connection is permanently wired within the connector block to provide protection against series and common mode interference As with the 35953A connector block it is not essential to terminate unused channel inputs but it is nevertheless good practice to link terminals HA HP and L Alternatively the IMP can be commanded to skip unused channels In an electrically noisy environment it is advisable to implement both the above precautions Note that interference rejection is more effective with the 35953A connector block owing to the separate Guard terminal Therefore for any critical measurement or where severe interference series or common mode may occur it is advisable to use the 35953A connector block WARNING Several IMP types are capable of withstanding up to 500 volts between input channels This means that potentially lethal voltages sourced from the system being monitored may be present on the connector blocks To ensure operator safety extreme care must be taken to isolate high voltages from the connector block whenever channel connections are being altered CSE 3595 Installation Guide Issue QF IMPs 3595 1A C E Connector Blocks 3595 3A D 5 3 2 INTERNAL ORGANISATION The
13. Issue RM 1 THE 1H AND 1J UNIVERSAL IMPS The 1H and 1J IMPs are intended for compact systems that must cope with a wide variety of input signals and measurement types Each IMP provides eighteen channels that can be used for an analog or digital input and two channels that can be used for a digital input or output The facilities provided by the 1H and 1J IMPs are an enhanced version of many of the facilities provided by the IA IB 1C IE 2A and 2B IMPs The 1H and 1J IMPs can therefore be used in place of these IMPs where a comparatively small number of channels are dedicated to a variety of signal types This avoids the cost of redundant channels and provides for system economy The only difference between the 1H and the 1J IMPs is that of the channel to channel isolation of Channels 1 18 For the 1H this is 200V whilst for the 1J it is 500V The channel to channel isolation of Channels 19 and 20 on both types of IMP is 120V For all connections to the measurement channels S Net and external power the 1H and 1J IMPs use the 3595 3J Connector Block 1 1 UNIVERSAL IMP CONSTRUCTION The Universal IMP is available in two case styles e The 3595 1H and 1J Universal IMPs are housed in the new aluminium case described in Section 1 1 1 These IMPs use a connector block type 3595 3J which is described in Section 3 in this chapter e The 3595 551H and 551J Universal IMPs are equivalent to the 3595
14. JWS 3595 Installation Guide Issue RM 3595 1Hand 1JIMPs 12 23 12 24 3595 1H and 1J IMPs JWS 3595 Installation Guide Issue RM Measurement Techniques Contents 1 Introd ctioM eem A 3 2 usiqoric ee Mr A 3 3 Measurement Concepts sess nnne nnn A 4 3 4 Voltage M aeUremebt geogr ete HE ur RE er REMO He Ee RO Agen igne A 4 3 2 Current Measurement ics ete ete epe eet LL A 4 3 3 Resistance Measurement eene nennen nnne nennen einen ns A 4 3 4 Strain Measurement ii A 6 3 5 Temperature Measurement i A 12 3 6 Frequency Measurement ii A 16 3 7 Quality of Measurement enne trennen enne A 16 4 Combating Inter Tee EIERE DIU divus A 18 4 1 Types of Interference A A 18 4 2 Common Mode Rejection eene enne nnne nennen A 19 4 39 Ac Series Mode Rejection tdt that tb a er E EIER edid A 20 44 Dnft Gompensaltion ino rere ehe eh eo Ree io A 21 4 5 Avoiding Interference cii ti HERR MUERE ERA EEUU RR ELE ROoiRad8 A 21 5 Effect Of Parallel Instrumentation nnnnnnsensneeeeeneneerenssrnenrsnsrrrrnnsrsrsrsnrsrsrererns A 24 5 1 Input Leakage Current im eR eH etd Leere teretes A 24 5 2 Accumulated Charge eene nennen trs estet entere enne A 25 JWS 3595 Installation Guide Issue RA Measurement Techniques A 1 List of Figures Figure A 1 Principle of current measurement iii A 4 Figure A 2 Principle of resistance measurement
15. L process measurement solutions a 3595 Series Isolated Measurement Pods and Cards Installation Guide Issue RQ October 1999 Part No 35952061 GENERAL SAFETY PRECAUTIONS The equipment described in this manual has been designed in accordance with EN61010 Safety requirements for electrical equipment for measurement control and laboratory use and has been supplied in a safe condition To avoid injury to an operator or service technician the safety precautions given below and throughout the manual must be strictly adhered to whenever the equipment is operated serviced or repaired For specific safety details please refer to the relevant sections within the manual The equipment is designed solely for electronic measurement and should be used for no other purpose Solartron accept no responsibility for accidents or damage resulting from any failure to comply with these precautions GROUNDING To minimize the hazard of electrical shock it is essential that the equipment is connected to a protective ground whenever the power supply measurement or control circuits are connected even if the equipment is switched off All IMP and VIMP units must be connected to ground using the marked case stud before control or signal leads are connected Where mains power supply units are used the protective earth E terminal must be connected to the mains installation earth The ground connection must have a current rating of 25A AC SUPPLY
16. S Net Cable and Power Considerations Cable Selection Power Supply Units Available Siting and Securing an IMP IMP Siting Options Siting and Securing Individual IMPs Rack Mounted IMPs Rack Mounted IMCs IMP Connections IMP Connector Blocks Cable Entry Sealing S Net Cabling IMP Power Supply Sensor Connections IMP Address Switches IMPs 3595 1A C and E and Connector Blocks 3595 3A D Input Connections Internal Organization Measurement Preparations LED Display IMP 3595 1B and Connector Block 3595 3B Input Connections Internal Organization Measurement Preparation LED Display Contents Contents Chapter 7 OORUN Chapter 8 NOUOSWIMNE Chapter 9 NOUOSWGMNE Chapter 10 NOUOSWIMNE Chapter 11 1 2 Chapter 12 DAWN IMP 3595 1D and Connector Block 3595 3E Introduction Internal Organization Default Output Values and Minimum Current Output Connections Power and Cabling Considerations LED Display IMP 3595 2A and Connector Block 3595 3C Input Output Channels Internal Organization Logic Level Convention Logic Threshold Levels Input Channels Sampling Rate Measurement Preparation LED Display IMP 3595 2B and Connector Block 3595 3F Input Output Channels Internal Organization Logic Level Convention Logic Threshold Levels Input Channels Sampling Rate Measurement Preparation LED Display VIMP 3595 1F amp G and Connector Block 3595 3G VIMP Overview Internal Or
17. See Figure 3 6 Figure 3 6 Fixing the rear trims on an IMP mounting frame JWS 3595 Installation Guide Issue RM Siting and Securing an IMP 3 9 STEP 4 To secure the plastic runners at the front of the mounting frame fix the upper and lower front trims with M4 countersunk screws Fix a rack ear at each side of the mounting frame using M4 pan head screws and crinkle washers See Figure 3 7 Figure 3 7 Fixing the front trims and rack ears on an IMP mounting frame STEP 5 At the rear of the unit fix the lower clamp bar in its lowest position using M4 pan head screws with plain and crinkle washers Then fix the upper clamp bar with earthing studs in its highest position using M4 pan head screws with plain and crinkle washers See Figure 3 8 Figure 3 8 Fitting the clamp bars on an IMP mounting frame 3 10 Siting and Securing an IMP JWS 3595 Installation Guide Issue RM 3 1 STEP 6 Slide all of the IMPs into the mounting frame Figure 3 9 Then raise the lower clamping bar and lower the upper clamping bar so that the connector block screws rest inside the open slots Fix the clamping bars by tightening the M4 screws 8 HOLES 7 00x 10 00 Figure 3 9 Sliding an IMP into an assembled mounting frame IMP GROUNDING Grounding studs threaded M4 are provided in recesses on both sides of each IMP enclosure It is normal practice to connect one of the studs to the chassis of the equipment on which the IMP i
18. i A 4 Figure A 3 Resistance mesurement connections four wire ii A 5 Figure A 4 Resistance measurement connections three wire i A 5 Figure A 5 Typical etched foil strain gauge sss nennen nens A 6 Figure A 6 Full bridge strain gauge configuration voltage energized eseese A 8 Figure A Half bridge strain gauge configuration current energized iii A 9 Figure A 8 Four wire quarter bridge configuration common dummy sse A 9 Figure A 9 Three wire bridge configuration half and quarter bridge AA A 10 Figure A 10 Example of strain gauge orientation essen A 11 Figure A 11 Temperature measurement with a PRT ll A 13 Figure A 12 Installing a PRT a insertion type b surface mounted type A 13 Figure A 13 PRT connections three wire method sss A 13 Figure A 14 Thermocouple principle eese eene nnne enne nnne A 14 Figure A 15 Thermocouple connections made through reference unit cssc A 15 Figure A 16 Thermocouple connections made direct to the connector block A 15 Figure A 17 Common mode interference iii A 18 Figure A 18 The use of a floating ADC for common mode rejection assesses A 19 Figure A 19 The rejection of ac series mode interference at 50 HZ nosses A 20 Figure A 20 Preferred guarding arrangments
19. A thermocouple is simply a junction between two dissimilar metals which develops an emf proportional to its temperature A simple thermocouple can be made by twisting two suitable wires together but generally it is best to use one of the purpose built temperature sensors available from thermocouple manufacturers The principle of thermocouple measurement is illustrated in Figure A 14 Here it can be seen that a thermocouple circuit consists basically of a pair of thermocouple junctions connected in opposition The two emfs produced by the junctions act against each other Since the two junctions are of the same type they produce equal emfs when held at the same temperature in which case the resultant emf is zero If the measurement Junction is now heated to 100 C for example whilst the reference junction is maintained at 0 C then the resultant emf is a function of the two temperatures This principle applies for all thermocouple measurements and a wide selection of temperature sensors allows you to measure temperatures in the range 250 C through 2000 C Metal a Metal a Metal b Measurement Reference junction junction 100 C 0 C Figure A 14 Thermocouple principle Historically the two thermocouple junctions are known as the hot and cold junctions the cold junction being maintained at 0 C by a flask of melting ice Recently however the two junctions have come to be known more correctly as th
20. Fig 5 6 Current Measurement with the 35953A connector block sse 5 6 Fig 5 7 Current Measurement with the 35953D connector block esse 5 6 Fig 5 8 Temperature measurement with the 35953A connector block ii 5 7 List of Tables Table 5 1 Meaning of the LED Display ii 5 7 CSB 3595 Installation Guide Issue QF IMPs 3595 1A C E Connector Blocks 3595 3A D 5 1 5 2 IMPs 3595 1A C E Connector Blocks 3595 3A D CSB 3595 Installation Guide Issue QF 1 INPUT CONNECTIONS The IMPs 35951A 35951C and 35951E each have twenty switched channels which can be individually configured to measure voltage current or temperature by thermocouple CMOS switches DIL reed relay G Guard Gegen Gemen G Guard gri ets I I I Multiplex alc ca 2 Multiplex Rame perm l a Ll Control Control IMP 35951A IMP 35951C Fig 5 1 Schematic of the channel inputs For general applications the IMPs are used with the 35953A connector block This block provides three connections per channel H Hi L Lo and G Guard the latter giving protection against series and common mode interference Whilst it is not essential to terminate unused channel inputs it is nevertheless good practice to link terminals H L and G Alternatively the IMP can be commanded to skip unused channels In an electrically noisy environment it is advisable to implement both the above precautions
21. Figures assume an equal Mark Space ratio indicates default setting B 8 Specifications for IMPs type 35951H amp J JWS 3595 Installation Guide Issue RN Frequency Figures are for the default sample rate of 100kHz Gate Time 10ms 100ms 1s 10s Minimum frequency 100Hz 10Hz 1Hz 0 1Hz Resolution 100Hz 10Hz 1Hz 0 1Hz Limits of Error 0 004 rdg resolution Frequency signals with a value less than 0 1Hz should be measured using the Event Capture mode All Limits of Error assume an equal Mark Space ratio Period Figures are for the default sample rate of 100kHz Periods averaged 1 10 100 1000 Resolution 10us lus 0 1us 0 01us Limits of Error 0 004 rdg resolution Period measurements have a programmable timeout applied The timeout must be at least double the expected period Timeouts of 200ms 2s 20s and 50s are available The maximum period is therefore 25s Period measurements greater than 25s should use the Event Capture mode All limits of Error assume an equal Mark Space ratio JWS 3595 Installation Guide Issue RN Specifications for IMPs type 35951H amp J B 9 3 General Specifications Power Supply Power supply oo sn ee es ha caedes 10V to 50V d c Power feeds tua E Os via S Net cable or IMP terminals Power consumption of each IMP sss lt 1 8W Response Time Results returned from all IMPs on S Net enne 1s Isolation WAND 500V IMP to IMP hee REP ERU RR ENTER
22. analog to digital converter ADC which includes at its input a selectable hardware filter The digital output of the ADC is passed to DIGITAL SIGNAL PROCESSING for FFT analysis averaging and alarm detection The vibration data thus processed may be transmitted on request to the Host Computer or the Monitor PC For test purposes the EXTERNAL MONITOR outputs of the ADC allow the selected vibration input and its companion trigger signal to be monitored by an external device For this the VIMP is operated in its test mode ALARM EVENT INPUT OUTPUT Hie FOUR TRIG RS 232 GER INPUTS INTERFACE EXTERNAL MONITOR selected vibration input and trigger input 16 VIBRATION INPUTS aoe DIGITAL SIG S NET S Net p E PROCESSING INTERFACE 16 VIBRATION INPUTS FOUR TRIG GER INPUTS This part of the circuit is in the 35951G only Fig 10 1 Simplified block diagram of the 35951F G VIMP hardware 10 4 VIMPs 3595 1F G Connector Block 3595 3G JWS 3595 Installation Guide Issue RN 3 MEASUREMENT CONNECTIONS Measurement connections are made to the 35953G Connector Block The 16 channel VIMP 35951F uses one such connector block whilst the 32 channel VIMP 35951G uses two A 35953G Connector Block is secured in the VIMP casing by two captive knurled screws and can be conveniently removed from the VIMP for connections to be made To do this simply undo the two securing screws and withdraw the connecto
23. country to country Thermocouple terminations are either color coded in the same way H or marked and An IMP type 35951B is able to operate with eight different types of thermocouple B E J K N R S and T All measurement results are linearized to comply with the IEC 584 and BS 4937 Standards The different temperature ranges thus made available are listed in Table A 2 Reference junctions These are maintained Connector Y e at the reference temperature for example Positive wire 0 C by a reference unit Block 35953A N DE Temperature 4 oo Ot o Hi I I sensor NY uu Wi Later o Lo M A Negative wire V yY b Extension compensating cables Copper wire cables Figure A 15 Thermocouple connections made through reference unit Connector Positive wire Block 35953A i NE Temperature o Hi sensor Qt E I S i i Negative wire kes J Extension compensating cables The temperature of the Hi and Lo terminals which act as the reference junctions is monitored within the connector block This temperature is compensated for in the temperatures measured at the temperature sensor Figure A 16 Thermocouple connections made direct to the connector block JWS 3595 Installation Guide Issue RA Measurement Techniques A 15 Table A 2 Thermocouple Ranges Thermocouple Type Overall Temp Range C 80 to 1820 200 to 1000
24. sss 120V Common mode between IM 500V M T B F to MIL217E 124 000hrs IMP 130 000hrs IMC Inputs Voltage between thresholds 0 and 1 3 0 and 9V Resistance between thresholds 80kQ and 500kQ Oz 120V Mini input drive GUTE coc rtr i fere net ete e aaa ri 600uA Input sample rates EE 50Hz 4 sample debounce is used Input functions Status Events time of ve or ve edge accuraoy seeeee 20ms Maximum number of buffered events is 128 per IMP Outputs FET switch which closes for a logic 1 Maximum withstand 60V Maximum sink per channel 100MA Watchdog Hardware Timeout 1 2s Software Timeout Programmable 1 to 255s JWS 3595 Installation Guide Issue RF Specifications for IMPs type 1A B C D E F G amp 2A B C 11 5 35951D Analog Output IMP Specification Note This specification also covers 359551D Analog Output IMC but the performance figures quoted cannot be guaranteed when the IMC is installed in a non hermetically sealed enclosure in humid environments Elle ge gel NEE 4 Output functions eeeteeeeeteeeeteeteeeeees Bipolar d c voltage unipolar d c current Isolation between channels enn 500V d c Output nolSQ coat EE aa lt 0 1 fs Setting time to 1 D 75ms from transmission from host and 40ms between channel values M T B F to MIL217E eee 94 000hrs IMP 103 000hrs IMC Voltage Outputs RANGE e 10 000V to 1
25. starting and stopping on ve edge 4 7 8 Pulse Width For a one shot single pulse signal it is possible to measure either a positive pulse Figure 12 17 or a negative pulse Figure 12 17 Measurement of a Positive pulse 4 7 9 Time Out To avoid an IMP hanging indefinitely should an event fail to happen a timeout period must be specified The following fixed time out periods are selectable with the CH TI command 200ms 2s 20s and 50s The default value is 2s If one period is to be examined the time out must be at least double the expected period For two input periods or more the time out must be greater than the input period times the number of periods examined For example to measure one input period of about 50ms a time out of 200ms would be satisfactory However to measure ten time periods of 50ms a time out of at least 500ms is required A fixed timeout period of 2s is therefore suitable 12 20 3595 1H and 1J IMPs JWS 3595 Installation Guide Issue RM 4 8 DIGITAL OUTPUT CHANS 19 20 Channels 19 and 20 can each be configured as a digital output to drive low power devices such as indicators In this configuration the output consists of an open drain MOSFET which can be regarded simply as a resistance switch For switch closed the resistance between OUT and COM 10 For switch open the resistance between OUT and COM 10MQ The rating of the FET is 80V 1W with a steady state curren
26. 1 9kW 0 1kW UWS 3595 Installation Guide Issue RF Specifications for IMPs type 1A B C D E F G amp 2A B C 5 2 35951B Analog Measurement IMP Specification Note This specification also covers 359551B Analog Measurement IMC but the performance figures quoted cannot be guaranteed when the IMC is installed in a non hermetically sealed enclosure in humid environments N mber of channels uideo ceec ertet A a E 10 iieri solid state six pole Maximum signal measured nm ennemis 2V Overload protection continuous i 50V Maximum voltage between any input and any guard i 14V max Common mode between IMPS nennen nnne 500V M T B F to MIL217E 106 000hrs IMP 113 000hrs IMC Measurement Viele Ne E 0 to 2V Resistance 4 amp 3 Terminal i 0 to 2 5kQ Resistance Thermometer 4 amp 3 Terminal 1000 PRT Stallman ae ee PAR rte ead EE Odes three wire quarter half and full bridge Sensor energization iii 0 8 or 4mA Dummy supplied cote cree HL ER Eee erret 120Q 0 1 5ppm C Interference Rejection 35951B Specifications are for 1kQ imbalance in Hi and Lo leads 20ms 16 67ms Integration time Normal mode 50 or 60Hz 0 1 ii gt 60dB Effective common mode rejection Le gt 120dB 50 or 60Hz 0 19 gt 120dB 50 0r 60H2 1 socia ciano iaia gt 100dB 5ms 4 17ms 1 25ms 1 04ms Integration time Nor
27. 1 Capture Rate and Event Resolution v Sample Hate 8 10 Table 8 2 Count Rate v Sample Hate 8 11 Table 8 38 Maximum Input Frequency v Sample Hate 8 13 Table 8 4 Result Resolution v Measurement Time essen 8 14 Table 8 5 Minimum Input Period amp Result Resolution v Sample Rate sss 8 15 Table 8 6 Meaning of the LED Display esseceesssseseeesrsneessrrnessnnnrnnesnnnnnnensnnnnnnnnnnnnnnnnennnnnnnnnnnnnnne 8 18 8 2 IMP 35952A Connector Block 35953C CSB 3595 Installation Guide Issue RP 1 INPUT OUTPUT CHANNELS The 35952A IMP provides twenty transformer isolated channels that can be configured individually as inputs or outputs As an input a channel can record status can capture and count events or can measure time periods and frequency As an output each channel which consists of a transistor switch closes for a logic 1 short circuits the output terminal to common and opens for a logic 0 Three terminals are provided for each channel INPUT OUTPUT and COMMON A SV 20mA short circuit protected power supply is available at the 5V OUT terminals This supply can be connected across contacts in the external plant so that their open or short circuit status can be recorded It can also be used to energise lamps relays etc when the channel is configured as an output OP 0 oq ooo R O lt I a i split pad JTA LOM sample JL Fig 8 1 Input output channel circuit CSB 3595
28. 1 The 1H and 1J Universal IMPS nennen 12 3 1 1 Universal IMP Construction nennen nnne 12 3 1 2 ele tele UE 12 4 2 Channel d d EE 12 5 3 The 35953J Connector Block ee eeceeeeeeeeeeeeeaaeeeeaeeeeaeeeeaaeseneeseeeeeeee 12 6 4 Measurement Preparation i 12 7 4 1 Voltage Measurement Chans 1 18 12 7 4 2 Current Measurement Chans 1 18 12 8 4 3 Temperature Measurement Thermocouple Chans 1 18 12 9 4 4 Resistance Measurement Chans 1 18 i 12 10 4 5 Temperature Measurement Rtd Chans 1 18 i 12 12 4 6 Status Input Chans 1 18 12 13 4 7 Status Input and Event Counting Chans 19 20 12 14 4 8 Digital Output Chans 19 20 i 12 21 5 EED Display 4 ett aterert a ae tad aaa neath netted 12 22 6 Selecting the Power Supply Source 12 23 List of Figures Figure 12 1 The 35953J Connector Block iii 12 6 Figure 12 2 Example of voltage connections esssssssssssssssseseee ennemi 12 7 JWS 3595 Installation Guide Issue RM 3595 1H and 1J IMPs 12 1 Figure 12 3 Example of current connections ii 12 8 Figure 12 4 Example of thermocouple connections seen 12 9 Figure 12 5 Example of resistance connections i 12 11 Figure 12 6 Example of RTD connections i 12 12 Figure 12 7 Logic level interpretation on C
29. 10V or TTL Analog resolution OPERE 79mV AG bandwidth ii nt t tem mele aby a 2Hz to 1kHz Blocking Voltage cscs inte ita Deb eee eee eee i endete iei erred 90Vdc lu Ee 2 revolutions Order ET ET PLL clock generation Event trigger Number of channels i 1 optical isolator ele ve edge VE re E ML RE 5mA 15mA Energization voltage 2 9Vdc 5 5Vdc with 270Q fitted resistor other ranges selectable by resistor change PROCESSING Time domain Block lengthS 256 512 1024 2048 4096 or 8192 Overall Tu rsa Acceleration velocity or displacement Alarm DND sila aaa dillo RMS peak or peak to peak Averaging BEE E 1 255 programmable C 14 Specifications for IMPs type 1A B C D E F G amp 2A B JWS 3595 Installation Guide Issue RF Spectra Nu mber of linesis 5 nid eere iis 100 200 400 800 1600 3200 Baseband frequency 25Hz 100Hz 200Hz 500Hz 1kHz 2kHz 5kHz 10kHz or 20kHz WindOWs canens ia Rectangular hanning flat top or hamming Spectral alarms i 10 programmable frequency bands Alarm types ii Above below in window out of window WII 1 4096 programmable Average type esie iei i UA UG ne RMS Processing time i 0 5s per 400 line spectrum per channel Orders iii EH 1 8 programmable Watchdog clock Time and date stamp resolution 1s OUTPUTS Alarm relays SIOSIFERIL dicts tah RR Gees 1 relay 35951
30. 210 to 1200 210 to 1370 210 to 1300 50 to 1760 50 to 1760 200 to 400 voa r D D Full details of the individual temperature ranges are specified in Appendix B of the manual 3 6 FREQUENCY MEASUREMENT The IMP type 35952A is able to measure pulse repetition frequencies up to 49kHz This provides for the pulse streams produced by sensors such as flow meters and shaft speed indicators The 35952A is also able to measure period which is useful for obtaining a satisfactory resolution in the measurement of low frequencies After obtaining a period measurement the host can compute the reciprocal value to obtain the corresponding frequency 3 7 QUALITY OF MEASUREMENT The quality of a measurement is expressed in terms of resolution and accuracy To appreciate the measurement ability of the IMPs it is important not to confuse these two terms Therefore a concise definition of each one is now given Also defined is the term repeatability which is another important aspect of measurement quality 3 7 1 Resolution Resolution describes the fineness of a measurement In other words it is the smallest amount by which your measurement result can change As an example an IMP type 35951A C or E is able on its 20mV dc input range to measure dc voltages with a resolution of 1u V one millionth of a volt Thus you can measure voltages of 0 001 mV 0 002mV 0 003mV and so on up to around 20 001mV Similarly on
31. 4 5 Sampling he oot teu ai nS culis 9 4 6 Measurement Preparation e 9 5 Gil LIME ere oor Cts E 9 5 GET EE 9 6 6 34 Watchd9og aio vii enni lei cine ei ia 9 6 6 4 Event Capture civic ene ian iaia lana aa 9 7 6 5 Digital OUTPUT 2c ete edt ett LL a eee 9 7 7 LED Display EE 9 8 List of Figures Fig 9 1 Schematic of the IMP operation ii 9 3 Fig 9 2 Positive logic convention essen ene nnne nre nenne 9 4 Fig 9 3 Input channel thresholds iii 9 4 Fig 9 4 Connection terminals iii 9 5 Fig 9 5 Pin functions of the S Net connector iii 9 5 JWS 3595 Installation Guide Issue RQ IMP 3595 2B Connector Block 3595 3F 9 1 Fig 9 6 Pin functions of the D Type connectors ii 9 6 Fig 9 7 Input channel threshold levels AAA 9 6 Fig 9 8 Equivalent circuits of the digital outputs essen 9 7 Lig99 Digital Output i t t ete ete a a techos as 9 7 List of Tables Table 9 1 Meaning of the LED Display sse nennen enne 9 8 9 2 IMP 3595 2B Connector Block 3595 3F JWS 3595 Installation Guide Issue RQ 1 INPUT OUTPUT CHANNELS The 35952B IMP provides thirty two transformer isolated channels four of which can be configured as output if required channels 29 32 As an input a channel can record status or capture events As an output each channel which consists of a transistor switch closes for a
32. 8mA 2 active gages 0 06 rdg 6ue lt 0 33ue 0 004 rdg per C Half bridge 4mA 1 active gage 0 06 rdg 8ue lt 3 45ue 0 004 rdg per C Quarter bridge 4mA 1 active gage 0 06 rdg 14ue lt 8 45ue 0 004 rdg per C 5ms 4 17ms Integration time Type Limits of Error Temperature Coefficient Full bridge 8mA 2 active gages 0 06 rdg 24ue lt 0 33ue 0 004 rdg per C Half bridge 4mA 1 active gage 0 06 rdg 32ue lt 3 45ue 0 004 rdg per C Quarter bridge 4mA 1 active gage 0 06 rdg 56ue lt 8 45ue 0 004 rdg per C 1 25ms 1 04ms Integration time Type Limits of Error Temperature Coefficient Full bridge 8mA 2 active gages 0 06 rdg 96ue lt 0 33ue 0 004 rdg per C Half bridge 4mA 1 active gage 0 06 rdg 128ue lt 3 45ue 0 004 rdg per C Quarter bridge 4mA 1 active gage 0 06 rdg 224ue lt 8 45ue 0 004 rdg per C C 8 Specifications for IMPs type 1A B C D E F G amp 2A B JWS 3595 Installation Guide Issue RF 3 35952A Digital Input Output IMP Specification Note This specification also covers 359552A Digital Input Output IMC Number of channels may be an input or output i 20 Isolation channel to channel or ground nenne 500V Common mode between IMPS nennen nnne 500V M T B F to MIL217E a aia 145 000hrs IMP 155 000hrs IMC Inputs Voltage between thresholds 0 and 1 0 8 and 2 0V
33. 9 1 10 1 mark space ratio or vice versa Figure 12 13 Effect of mark space ratio on event count rate 4 7 5 Frequency Frequencies can be measured from 8mHz through 49kHz However the maximum frequency depends on the mark space ratio of the input signal being 1 1 Any deviation from 1 1 in either direction will lower the maximum measurable input frequency as shown in in Figure 12 14 100 measurable 60 input 50 frequency 96 of max q 0 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 1 10 1 mark space ratio or vice versa Figure 12 14 Effect of mark space ratio on measurable input frequency The accuracy and resolution of results depends upon the choice of measurement time as shown in Table 12 4 The longer times give the greater accuracy less uncertainty in the final result 12 18 3595 1H and 1J IMPs JWS 3595 Installation Guide Issue RM 4 7 6 4 7 7 Table 12 4 Result Resolution v Measurement Rate Measurement Time Result Resolution 10s 0 1Hz 1s 1Hz 100ms 10Hz 10ms 100Hz It is essential to use a measurement time that is adequate for the expected input frequency For example when measuring 2Hz period 500ms there is no point in using a measurement time of 100ms since only 20 of the input signal would be seen A better measurement time is 10 seconds which measures over 20 complete cycles Period Time periods single pulses or whole cycles can be measured from 20ys up to 160 seconds with
34. Common C16 Common C15 Common C14 Common C13 Common C12 Common C11 Common C10 Common C9 Common C8 Common C7 Common C6 Common C5 Common C4 Common C3 Common C2 Common C1 Not Used rt e 737 Output 132 of eg SE Output I31 guess A Output 130 rr Of DE mt ET d Common C32 Input 31 O 7 7 Common C31 Input 130 O Common C30 Input 129 O Common C29 Input D8 lt O TTE Common C28 Input 27 oO 7 Common C27 Input 126 Jo7 Common C26 Input 125 lo7 Common C25 Input 24 0 Common C24 Input 23 1lo Common C23 InptD2 Oo Common C22 Input 21 107 Common C21 Input 20 lol Common C20 Input 19 10 250 Common C19 PL2 Fig 9 6 Pin functions of input and output connectors STATUS The purpose of status measurement is to ascertain the logic state of a signal Inputs are judged to be at logic 1 or logic 0 according to the selected input threshold levels Remember that a logic level between the selected thresholds may be interpreted either as logic 0 or logic 1 logic 1 500kQ 80kQ Indeterminate logic 0 a input thresholds for volt free contact Fig 9 7 WATCHDOG 9 0V 3 0V logic 1 Indeterminate logic 0 b input thresholds for voltage input Input channel threshold levels Once the watchdog is enabled the watchdog output channel 32 will go from a off state to aon state I
35. Connections CSB 3595 Installation Guide lssue RM The 3595 95B connections are shown in Figure 4 13 Klippon terminals can be fitted to the interior of the 3595 95B cabinet To use these terminals connect a wire link between each klippon terminal and the corresponding terminal on the internal power supply unit Then connect S Net and the ac supply connections to the klippon terminals as shown Access to the screw terminals on the internal power supply unit is gained through slots in the cover 230V 115V Selection Link oeoeo joooooooo Power to S Net Connection to ac supply Figure 4 13 Connections to the 3595 95B power unit CSB 3595 Installation Guide Issue RM IMP Connections 4 13 4 2 4 2 1 4 14 VIMP POWER SUPPLY UNIT The vibration measurement front end of a VIMP is always powered locally from a 359595D Power Supply Unit This unit can provide sufficient power for two VIMPs of either type 35951F or G Note that a VIMP must also receive power from S Net for the S Net interface Fitting Feet to the VIMP Power Supply Unit The four mounting feet of the 359595D Power Supply Unit are bolted individually to the unit In each case the bolt is fed through a hole in the corner of the case from the inside and screwed into the foot on the outside WARNING The feet of the power supply unit constitute exposed metalwork and therefore they must be grounded To ensure this a
36. Contact Q NOTE Although input Logic 1 levels of up to 50V may 24M OV be safely handled by the 29 ka 1H and 1J IMPs this Indeterminate does overload the input and is not desirable 0 8V 3 0V 100Q It is recommended that in Logic 0 puts do not exceed 12V in normal use Figure 12 7 Logic level interpretation on Channels 1 through 18 The rate at which signal status is determined depends upon the frequency at which the host issues status measurement commands ME TR SP The connections for status measurements on channels 1 through 18 are shown in Figure 12 8 Note the difference between the connections for voltage logic and those for voltage free contact logic Voltage Voltage Contact Contact connections connections connections connections A A Cr N C N CH 1 CH2 CH 1 CH 2 Figure 12 8 Example of status input connections Channels 1 through 18 JWS 3595 Installation Guide Issue RM 3595 1Hand 1JIMPs 12 13 4 7 4 7 1 4 7 1 1 STATUS INPUT AND EVENT COUNTING CHANS 19 20 Channels 19 and 20 can be used to ascertain the status of a digital input and to count events Whereas a status signal tells you which of two possible states an external device is in an event count tells you how many times that particular state has occurred Input Sampling Rate In common with all multi channel logging instruments IMPs do not monitor their input channels continuously but examine them at regular inte
37. E etter ive heer etie ton oie tede 2 relays Relay connections seeeeee normally open and normally closed Outp t CC ne KEE 50Vdc at 60mA Vibration input test i single point from any analog input Trigger input test eii single point from any trigger input CAU iran Four LEDs indicate VIMP status STORAGE Memory butfer size oett N ie 256Kbytes C apaclly serio ara 100 tasks 120 overalls 400 line spectra Power fail holdup timer 1 hour typical without data loss MECHANICAL Dimensions 35951 Fina eee ein Ae a 430x215x69mm 17 1x8 5x2 8 EEN Le ES 430x215x103 5mm 17 1x8 5x4 2 359595D PSU negata 300x300x200mm 11 8x11 8x7 8 359595D Ser IMP 430x215x35 4mm 17 1x8 5x1 4 PIOLEGHON geed Ae NEMA 4 IP55 ENVIRONMENTAL Rule ICC 0 to 55 C El ridity tet eee beim 9596 RH non condensing K ler EE 1G 11 500Hz POWER VIMP Power consumption esses enne 15Watts max DC Inputs 35951F 35951G ura ME 500mA 1A AON soci eat eS gin bo etel eden 300mA 600mA Mop RES 400mA 400mA SOM m M TOOMA 100mA 359595D PSU tu e eR te ete es Powers 1 or 2 VIMPs JWS 3595 Installation Guide Issue RF Specifications for IMPs type 1A B C D E F G amp 2A B C 15 COMMUNICATIONS Standard S Net Dataraler msn aiar 163kbits s Ee Elei NEE 500V Connection s
38. Ge de Wes pe ie 500V min Analog to Digital Conversion Analog to digital converter ui 15 bits sign Analog scanner leakage currents at 25 C 3 C 3I9SLA IB alla ELL La Lr aN i lt 60nA Analog IMP channel crosstalk eese nennen gt 120dB ADC input impedance ui iaia gt 10GQ IMP Environment Storage temperatufe qe een ete tee ela a rhe 25 C to 75 C Operating temperature eni bale en aee den lanl Miva Hs 20 C to 70 C Humidity at 40 C non condensing e 95 Vibration operating for 2 hours 5g 11Hz to 500Hz Otherwise to Def Std 66 31 Issue 01 Cat IV IMP Packaging Sealed aluminium casting to BS5490 IP55 IEC 529 and NEMA ICS6 Class 4 Dimensions itteni s 435mmx215mmx34 5mm 17 1 x8 5 x1 4 Protr sion of cable boots 50mm 2 KE 2 5kg 5 51bs Electromagnetic Compatibility Complies with 2e tie eee cete ettet te is EN50081 2 and EN50082 2 Note High levels of radiated or conducted radio frequency interference as defined in EN50082 2 may reduce the accuracy of low level measurements B 10 Specifications for IMPs type 35951H amp J JWS 3595 Installation Guide Issue RN Specifications for IMPs type 35951A B C D E F G amp 35952A B Contents 1 35951A C amp E Analog Measurement IMP Specification C 3 2 35951B Analog Measurement IMP Specification rreren C 6 3 35952A D
39. IMP is shown schematically in Figure 5 2 and consists basically of a the microprocessor b a logic array to handle network communications c an input multiplexer to switch through the twenty channels d an Analogue to Digital Convertor ADC The ADC in the IMP is of the Solartron pulse width type The integration measurement time has a default value of 20ms which automatically tends to cancel out interference derived from 50Hz mains supplies For those countries using 60Hz supplies the integration time can be set to 16 66ms by command from the host channel 1 o channel 2 o Analogue Digital Multiplexer Communications I channel 200 Supervisory Microprocessor pe Supplies Fig 5 2 Schematic of the IMP operation 5 4 IMPs 3595 1A C E Connector Blocks 3595 3A D CSB 3595 Installation Guide Issue QF 3 MEASUREMENT PREPARATIONS 3 1 VOLTAGE Voltage can be measured with either the 35953A or 35953D connector blocks Ranges 20mV 200mV 2V 10V and autorange are available With the IMPs 35951C and 3595 1E only voltages above 10V can be measured on the 10V range using the attenuated 50 1 input of the 35953D connector block In this case all results received by the host must be multiplied by 50 For optimum protection against electrical interference when using the 35953A connector block connect the G Guard terminal to L Lo as shown in Fig 5 3 G Guard must not be left disconnected since it forms an in
40. IMPs 3595 1B Connector Blocks 3595 3B CSB 3595 Installation Guide Issue QF 3 4 2 Half Bridge gauge A half bridge strain gauge of two gauges mounted at the measurement site In principle both gauges are active although in practice one may be replaced by a dummy a resistor or gauge used to provide temperature compensation The upper half of the bridge is replaced by the dual current supply of the IMP A typical application with two active gauges would be in measuring the strain on a beam in bending two active gauges are used one on the top face of the beam and one on the bottom Figure 6 11 shows the schematic of the half bridge measurement circuit energization currents Fig 6 11 Schematic of the half bridge measurement circuit Initialization On initialization the IMP switches I off I on and measures the gauge voltage Vg The IMP s microprocessor uses the following algorithm to calculate strain Vx Vo E GVg In pstrain Vx Vo 1 0 m GVg where Vo initial out of balance voltage Vg gauge voltage at initialization Vx strained out of balance voltage G gauge factor for one active gauge use 2G for two active gauges which must be identical CSB 3595 Installation Guide Issue QF IMPs 3595 1B Connector Blocks 3595 3B 6 11 The five wire measurement connections for the half bridge gauge are shown in Figure 6 12 Note that terminals H and I ds and L and I5 should be joined at the bridge not a
41. Installation Guide Issue RP IMP 35952A Connector Block 35953C 8 3 2 INTERNAL ORGANISATION Basically the IMP consists of a microprocessor and six logic arrays as shown in Figure 8 2 One array handles the network communications whilst each of the other arrays receives four input channels channel 1 Counter O timer atch channel 4 o channel 5 Counter timer channel 8 o gt latch channel 9 Counter processor timer atch OA channel 12 o channe ios Counter timer atch o gt channel 16 o DC supplies channel 17 o gt Counter 0 timer channel 20 0 9 latch Fig 8 2 Schematic of the IMP operation Each logic array contains four identical status event circuits The circuit schematic is shown in Figure 8 3 channel input data bus overflow interrupt 4 bit counter sample freq select event I interrupt A timer counter counter channel sample frequencies control overflow select Fig 8 3 Schematic of a status event circuit 8 4 IMP 35952A Connector Block 35953C CSB 3595 Installation Guide Issue RP Each array has its own frequency period circuit Figure 8 4 which is shared by the four channels in that array If two or more channels are to measure frequency or period using long measurement times then it is beneficial to distribute these channels throughout the arrays
42. Net network and will normally be fitted close to the IMPs The unit is enclosed in a protective cabinet together with a DIN rail for field wiring connections The 95B unit operates at 48VDC and may be used as a power source for transducer conditioning as well as for powering IMPs The unit is capable of supplying 50 watts but it is recommended that no more than 20 Universal IMPs or 30 IMPs of any other type are connected to any one unit This is to avoid problems with excessive heat dissipation within the protective enclosure Full instructions are supplied with the unit NOTE It is permissible for a battery powered S Net system to have a charger per manently connected The batteries themselves provide adequate smoothing of the charger output A battery powered system must be protected by a fuse CONNECTION TO AC MAINS SUPPLY The 3595 95A and B Power Supplies are intended for permanent installation To comply with EN61010 the installation must meet the following safety requirements 1 To allow a power unit to be isolated from the ac supply the supply must be routed through a switch or circuit breaker 2 The switch or circuit breaker must be in easy reach of the operator 3 The switch or circuit breaker must be clearly identified as the means of isolation of the power unit 4 The maximum current drawn from the ac supply must be limited by a fuse or trip to a maximum of 13A The installation of the 3595 95A and B Power
43. Supplies is described in Sections 3 2 1 and 3 2 2 JWS 3595 Installation Guide Issue RM S Net Cable and IMP Power 2 7 3 2 1 Installation of the 3595 95A Power Supply 1 The voltage selector must be set to correspond with the local ac supply voltage The unit has a link that is open for a 240V nominal supply and closed for a 115V nominal supply 2 Theac supply must be connected as follows a line to terminal L b neutral to terminal N c earth ground to terminal E 3 2 2 Installation of the 3595 95B Power Supply 1 The voltage selector must be set to correspond with the local ac supply voltage The unit has a link that is open for a 240V nominal supply and closed for a 115V nominal supply 2 The ac supply must be connected as follows a line to terminal L b neutral to terminal N c earth ground to terminal E 3 The ac supply cable must be firmly secured by the clamping bush of the cable gland supplied This gland accommodates round cables of diameter 4mm through 7mm The installation cabling should also be secured to the wall or support structure in accordance with good installation practice The earth ground of the ac supply must be connected to the earth stud marked a that is located inside the enclosure 3 22 1 Ensuring Electromagnetic Compatibility of the 359595B To conform with the EU directives regarding electromagnetic compatibility the cable carrying
44. VOLTAGE Never operate the equipment from a line voltage or frequency in excess of that specified Otherwise the insulation of internal components may break down and cause excessive leakage currents FUSES Before switching on the equipment check that the fuses accessible from the exterior of the equipment are of the correct rating The rating of the ac line fuse must be in accordance with the voltage of the ac supply Should any fuse continually blow do not insert a fuse of a higher rating Switch the equipment off clearly label it unserviceable and inform a service technician EXPLOSIVE ATMOSPHERES NEVER OPERATE the equipment or any sensors connected to the equipment in a potentially explosive atmosphere It is NOT intrinsically safe and could possibly cause an explosion Continued overleaf SAFETY PRECAUTIONS continued from previous page SAFETY SYMBOLS For the guidance and protection of the user the following safety symbols appear on the equipment SYMBOL MEANING Refer to operating manual for detailed instructions of use In particular note the maximum voltages permissible at the input sockets as detailed in the Specification AN Hazardous voltages NOTES CAUTIONS AND WARNINGS For the guidance and protection of the user Notes Cautions and Warnings appear throughout the manual The significance of these is as follows NOTES highlight important information for the reader s special attention CAUTIONS g
45. With both gauges active this gives a bridge sensitivity of 2xG The number of leads is reduced to five and compared with a full bridge with four active gauges you have a saving of two gauges with a trade off of half the sensitivity Ia Dual current source provided by the 35951B IMP B Ho Vo Strain voltage a Two active gauges Current I R return Figure A 7 Half bridge strain gauge configuration current energized With regard to temperature compensation ensure that both bridge elements are mounted on the same material and are maintained at the same temperature Since the bridge is energized by a dual constant current source any variation in lead resistance has no effect on the strain voltage 3 4 4 3 Four Wire Quarter Bridge The four wire quarter bridge Figure A 8 is a variation of the half bridge It uses just one active gauge at the measurement site and shares a common dummy gauge with several other bridges Thus bridge sensitivity is solely that of the active gauge 2 for a metallic gauge but the number of lead wires is reduced to four and you need only one gauge per channel A Dual current source provided by the 35951B IMP Ho 8 Strain voltage L Ra Common dummy gauge local or remote One active gauge S Sensing G I Ne Current return Figure A 8 Four wire quarter bridge configuration common dummy JWS 3595 Installation Guide Issue RA Measurement Techni
46. analog or status inputs listed in Table 12 1 Channels 19 and 20 can be set to measure any of the digital inputs listed in Table 12 2 Table 12 1 Measurement Types for Channels 1 through 18 Measurement Type Choice of Input DC Voltage 20mV 200mV 2V 12V autorange DC Current 200uA 2mA 20mA 100mA autorange This assumes that a 100Q shunt resistor is fitted on the connector block Temperature Thermocouple types E J K R S T B and N with thermocouple internal or external cold reference junction compensation Open circuit detection and loop resistance measurement are available Resistance Four wire configuration for 25Q 2500 2k5Q 25kQ autorange Three wire configuration for 1k5Q 25kQ autorange Two wire configuration for 5000 25kQ autorange Temperature RTD 100 platinum 109 copper Status TTL 3V 9V volt free contact Table 12 2 Measurement Types for Channels 19 and 20 Measurement Type Comments Status TTL 3V 9V Event Count Increment or Totalise Maximum count is 16 777 215 24bits after which the count continues from zero Frequency 8mHz to 49kHz Time averaging longer than scan period does not delay other results Period 160s to 20us with resolution of 10ms Time averaging longer than scan period does not delay other results JWS 3595 Installation Guide Issue RM 3595 1H and 1J IMPs Channel 20 ca
47. and ranges of measurement the ADC temperature coefficients and any special factors that affect measurement accuracy see the IMP specifications in Appendix B of the manual 3 7 3 Repeatability Repeatability is an aspect of measurement quality that is particularly important when measurements are being compared with each other rather than against an absolute standard such as the Standard Volt Repeatability means that successive measurements of a stable physical quantity remain substantially the same over long periods assuming a stable ambient temperature This ensures that even if an IMP is slightly out of calibration after periods in excess of one year the results of differential measurements are valid JWS 3595 Installation Guide Issue RA Measurement Techniques A 17 4 COMBATING INTERFERENCE Interference is a general term for anything that influences a signal being measured to give a false result Usually the interference takes the form of an extraneous signal which combines with the signal being measured at the ADC input Sometimes however errors in the result may be caused by a variation in performance with temperature also known as drift Depending on the type of measurement being made an IMP is able to reject specific types of interference whilst accepting the signal to be measured It is still an advantage however to ensure that the signal being measured is as free of interference as possible This is achieved
48. are referenced to the zero stress condition Since strain gauge bridges rarely have zero output for zero load trimming resistors are sometimes employed to balance the bridge This method is fine for simple systems with only one or two bridges but is impractical for large systems The 3595 1B IMP avoids the necessity of using trimming resistors by measuring the zero load output and subtracting this from the loaded output With zero stress applied the IMP measures and stores the small strain voltage v for zero load When stress is applied the change in strain gauge resistance alters the balance of the bridge and produces a voltage V proportional to strain The true strain value is computed from the voltage difference V v and other factors such as gauge factor Bridge energisation Bridge energisation for strain gauge bridges measured by the 3595 1B IMP is provided by the modules integral dual current supply The range of strain that a 3595 1B IMP is able to measure depends on the gauge you are using The dual current supply is able to cope with the dual current requirements of all commonly used strain gauges The repeatability and the limits of error obtained with the various types of bridge are given in the Appendix B of this manual JWS 3595 Installation Guide Measurement Techniques A 11 3 5 1 A 12 TEMPERATURE MEASUREMENT To enable temperature to be measured a temperature sensor must be used This converts the thermal energy
49. both cases extension compensating cables are used to connect the reference junctions to the thermocouple For optimum rejection of electrical interference the G guard terminal must be connected to L low as shown in Figure 12 4 The G terminal must not be left disconnected since it forms an integral part of the measurement circuitry Reference Junctions Measurement Junction Measurement o Junction Reference Junction CH 1 CH2 Figure 12 4 Example of thermocouple connections JWS 3595 Installation Guide Issue RM 3595 1H and 1J IMPs 12 9 4 4 4 4 1 4 4 2 4 4 3 12 10 RESISTANCE MEASUREMENT CHANS 1 18 The resistance r of an external resistor is measured by passing a constant energizing current of known value i through the resistor and measuring the voltage v developed across it The resistance r is then computed from the equation r v i The resistance to be measured can be connected in three ways two wire three wire or four wire These are shown in Figure 12 5 and their uses are described in Sections 4 4 1 through 4 4 3 A current drive of 800A or 80uA dependent on range and or mode is supplied by the IMP The way in which this is applied depends on the measurement connections Two wire Resistance Measurement Two wire resistance measurement is the least accurate and is intended primarily for use in volt free contact status applications The ranges are 500Q 25kQ and autorange
50. by careful installation of sensors and input leads as outlined in Section 4 6 in this chapter 4 1 TYPES OF INTERFERENCE Interference can be classified as follows a inthe way it appears at the input terminals common mode or series mode and b the interference content dc or ac Common mode interference occurs when the interference source esm is common to the Hi and Lo inputs of the IMP See Figure A 17 EN Hi ADC 1 Hi i A Measured int voltage Figure A 17 Common mode interference Common mode interference does not affect the measurement directly If the input impedances Zu and Z were equal and the lead resistances R and R equal also common mode interference would have no effect the lead and input impedances would form a balanced bridge and therefore no voltage due to the interference e would appear across the Hi and Lo inputs In practice however the input impedances Zy and Zi are different Z generally being the lowest This imbalance results in an interference signal e ER xI R1xIg across the Hi and Lo inputs and common mode interference is thus converted into series mode interference A high resistance in the Lo input lead generally aggravates the problem In the IMPs the problem of common mode interference has largely been solved by using floating inputs Section 4 2 gives the details A 18 Measurement Techniques JWS 3595 Installation Guide Issue RA Series mode interference acts in se
51. connections with protective boots To effect a good seal it is important that the cross section of the leads is more or less circular With twisted pairs a waterproof sealing compound such as Bostic may be necessary See Figure 4 2 H amp No sealing problems No sealing problems Use a waterproofing compound such as Bostik to effect a seal Figure 4 2 Cross sections of typical leads The general procedure for making connections to an IMP is given below Details of the S Net connections are given in Section 3 in this chapter whilst specific IMP terminations are described in Chapters 5 through 9 The general procedure is 1 Undo the two cover retaining screws and withdraw the cover from the rear of the connector block 2 With a sharp blade cut the tip off a rubber teat for each lead to be connected To ensure a good seal be careful not to cut off too much in one go 3 Push the first lead to be connected through the prepared teat To ease its passage the lead may be lubricated with silicone grease and if necessary a sleeve expansion tool used to stretch the teat slightly prior to lead insertion 4 4 IMP Connections CSB 3595 Installation Guide Issue RM 4 Strip off a 6mm length of insulation from each wire and connect as shown in the relevant IMP connector block chapter With multi wire leads having a separate cover remove just sufficient of the outer cover to allow wire separation ensure that the outer cover remain
52. is or was the last to be selected has its sync input available at this point COMMON This connector carries the common return for the NODE A and SYNC connectors The outer shell of each BNC connector is grounded CAUTION All connectors on the Local Setup Panel are specially sealed to prevent the ingress of moisture to the VIMP interior Where no mating connection is made to any of these connectors the connector cap provided must be fitted JWS 3595 Installation Guide Issue RN VIMPs 3595 1F G Connector Block 3595 3G 10 21 10 22 VIMPs 3595 1F G Connector Block 3595 3G JWS 3595 Installation Guide Issue RN Serial IMP 3595 93D Connector Block 3595 3H Contents 1 The Communication Gateway i 11 3 2 Serial IMP Connections iii 11 3 CSB 3595 Installation Guide Issue QF Serial IMP 3595 93D Connector Block 3595 3H 11 1 11 2 Serial IMP 3595 93D Connector Block 3595 3H CSB 3595 Installation Guide Issue QF 1 THE COMMUNICATION GATEWAY The Serial IMP provides an interface between RS232 and S Net The primary purpose of this device is to allow the vibration data acquired by hand held Analyzer Collectors to be up loaded to the Host Computer The Serial IMP may be powered either from S Net or from a local power supply 2 SERIAL IMP CONNECTIONS Connections are made to the Serial IMP through the 35953H Connector Block This is secured in the VIMP casing by two c
53. less accurate signal with reduced thermal stability than the four wire method For the lead resistances to be effectively nulled the conductors should be identical The four wire method has greater thermal stability and enables a more accurate measurement to be obtained Any differences in lead resistance have no effect on the measurement The Guard connection is not essential as the circuitry associated with the I terminal automatically provides interference rejection as well as acting as current return However it is still good practice to make this connection 12 12 3595 1H and 1J IMPs JWS 3595 Installation Guide Issue RM 4 6 STATUS INPUT CHANS 1 18 The purpose of status measurement on channels 1 through 18 is to ascertain the logic state of a signal Inputs are interpreted as logic 1 or logic 0 The logic levels to which Channels 1 through 18 respond may be selected with the CH MO command codes 700 702 Signal compatibility is thus offered for e TTL levels e 12V nominal levels e Two wire voltage free contact status The logic levels that the IMP interprets as a 1 or a 0 are shown in Figure 12 7 To avoid errors ensure that the input signal always occurs outside the ndeterminate region within this region a signal may be interpreted as either logic 0 or logic 1 To determine the status of voltage free contacts the IMP measures the resistance between them TTL 12V
54. of the sync channels Section 5 1 explains how to open up the VIMP and Section 5 2 shows how to configure the jumpers thus accessed NOTE Jumper configuration is essentially a job for an experienced installation engineer Spare jumpers Part No 351502100 may be ordered from Solartron 5 1 ACCESSING THE VIMP JUMPERS To access the VIMP jumpers you must remove the outer shell of the VIMP input card housing The procedure depends on the type of VIMP being configured 35951F dual case or 35951G triple case The relevant procedures are given in Sections 5 1 1 and 5 1 2 5 1 1 Accessing the Jumpers in the 35951F VIMP The procedure for accessing the jumpers in the 35951F dual case VIMP is as follows 1 Undo the knurled nuts securing the 35953G Connector Block and withdraw it from the VIMP assembly 2 Loosen the bolts securing the VIMP to its installation point If the VIMP is bonded to ground through the VIMP case through the point indicated in the diagram following Step 4 use an M4 nut spinner to remove the nut and star washer securing the ground lead and remove the lead from the VIMP 3 Lift the VIMP clear of the installation point and lay it on its mounting brackets in a convenient working space 4 Remove the eleven M5 socket head screws that secure the outer shell of the VIMP input card housing to the VIMP assembly For this you will need a 4mm Allen key If you have not aready removed the M4 nut and star washer mentioned in
55. opposite end of the IMP case The connector block can be removed from the IMP case in the same way as the main pcb This allows the IMP connections to be made A description of the 3595 3J Connector Block is given in Section 3 of this chapter A Universal IMP can be bolted to the measurement site through four holes provided in the case flanges It is preferable to mount Universal IMPs in a vertical attitude In a damp atmosphere any excess moisture then tends to drain away from the vulnerable areas where cables enter the IMP Further details on mounting IMPs including recommendations for a particularly hostile environment are given in Chapter 3 ADDITIONAL FACILITIES The 1H and 1J Universal IMPs have many facilities not available in other types of IMP These facilities are e Report of thermocouple loop resistance between the H and L terminals e Channel unit conversion with function y mx C e Post linearisation of measured input with a user defined fifth order polynomial e High and low level alarm checking with alarm output selectable from Channel 19 or Channel 20 e Synchronisation of auto scans with IMP real time clock e Three result modes selectable from Real time Same result format as a normal IMP readout Time tagged A bookmark and time tag are appended to each scan and to each single measurement A bookmark contains the date whilst the time tag contains the time of day Historical In this mode scans
56. or 3 0 and 9V Maximum input furia Ale e oett eset ebore E 25V or 100V Min input drive current secioni reee a E A enne nnne nnne trennen nnn nes 600uA Input sample rates programmable 20Hz 1kHz 10kHz 100kHz 4 sample debounce is used for 20Hz and 1kHz rates Input functions Status Events time of ve or ve edge accuracy i tims Fregquerioy EE 49kHz max Frequency gate times programmable 0 01 0 1 1 or 10s Period resolutions iat tee a ana a aa a it 10us Periods averagded 1 10 100 1000 ve or ve pulse Single shot minimum width nes 10us Count totalize or increment 24 bits gt 16 million Outputs FET switch which closes for a logic 1 Maximumv withstand ectetuer in 60V Maximum sink per channel enn 100mA Energization supply built me 5V 20mA Digital Input Counting and Event Capture per channel Maximum count rate per IMP is 15 000 s and is governed by software constraints Thus for a worst case input all channels driven by the same signal maximum count per channel is restricted to 750 s Maximum number of buffered events is 1500 per IMP Sample Rates 20Hz 1kHz 10kHz 100kHz Count Parameters Maximum frequency 2 4Hz 124Hz 4 9kHz 49kHz Minimum period 400ms 8ms 200us 20us Resolution of period 50ms 1ms 100us 10us Counts max rate 2 4 s 124 s 4900 s 15 000 s Event capture rate 5 s 100 s 100 s 100 s Event reso
57. present in the external circuit the IMP can generate over 17V in order to force the selected energizing current through the bridge 2 The sensor warm up period provided by the IMP is 1250us lt t lt 1406ps for 20ms integration and 1041us t lt 1172 us for 16 67ms integration The effect of the warm up period on the measurement timing is shown in Figure 6 8 ENERGIZATION I I 1 Au MEASUREMENT t E D L ime energization applied to bridge measurement commences I m energization removed t sensor warm up time Fig 6 8 Effect of IMP sensor warming period on measurement timing 6 8 IMPs 3595 1B Connector Blocks 3595 3B CSB 3595 Installation Guide Issue QF 3 4 1 Full Bridge gauge A full bridge strain gauge consists of four gauges mounted at the measurement site In principle all four gauges are active although in practice some may be replaced by dummies resistors or gauges used to provide temperature compensation Typical examples of use are a measuring the output of a load cell and b measuring the strain on a beam in bending four active gauges are used two on the top face of the beam and two on the bottom See Appendix A for explanation of technique Figure 6 9 shows the schematic of the full bridge measurement circuit In this circuit the I and I terminals supply the energisation currents whilst the H and L terminals are used to measure the bridge out of balance voltage On ini
58. so that the input leakage current is higher than expected at 15nA This is the case with all multi channel instruments and is not always quoted so beware Two examples of measurement errors due to leakage are given on the next page A 24 Measurement Techniques JWS 3595 Installation Guide Issue RA Example 1 An existing measurement system has a thermocouple connected to a 35951C IMP The user wishes to connect a Phillips PM8238 30 channel chart recorder to the IMP measurement circuit The measurement error due to leakage is approximately input leakage of chart recorder x thermocouple impedance 100pA x 300Q 3nV in terms of C this error is too small to consider Example 2 Two IMPs are connected to the same sensor for redundancy purposes This example also applies for an IMP connected in parallel to any existing measurement system The error due to leakage that is seen at each IMP is approximately IMP input leakage current x thermocouple impedance 15nA x 3000 4 5uV in terms of C this represents an error of 0 1 C which is significant when added to the overall uncertainty and is probably worth considering Note When measuring thermocouples in this way always disable the IMP s open circuit thermocouple detection facility 5 2 ACCUMULATED CHARGE In addition to the errors caused by input leakage current errors may arise due to charge injection from the other instrument during channel scanning This occurs when the
59. that the ability of the clay granules to absorb moisture is degraded each time they are reactivated therefore this method should be employed only in an emergency and no more than twice with the same granules For safety the case must be grounded at the stud provided see Figure 3 3 JWS 3595 Installation Guide Issue RM Siting and Securing an IMP 3 7 RACK MOUNTED IMPS A rack mounting kit is available as an accessory part number 359591A Each kit allows 10 IMPs to be housed in a standard 19 rack The overall dimensions of the assembled kit are 483mm x 510mm x 266mm 19 x 20 x 10 5 See Figure 3 9 Each kit contains e 2 side panels e support trays e plastic runners e 2reartrims e 2front trims 1 upper 1 lower e 2rack ears e 2clamp bars 1 upper 1 lower e 1 pack of screws nuts and washers STEP 1 Fix the support trays 4 off to the side panels 2 off using M4 pan head screws and crinkle washers See Figure 3 4 Add 1 plain washer to fixing hole if the panel hole is a slot Figure 3 4 Assembly of support trays and side panels for IMP mounting frame 3 8 Siting and Securing an IMP JWS 3595 Installation Guide Issue RM STEP 2 Slide the plastic runners 4 off into the support trays See Figure 3 5 Figure 3 5 Sliding the plastic runners into an IMP mounting frame STEP 3 To secure the plastic runners at the rear of the mounting frame fix the two rear trims with M4 countersunk screws
60. the S Net cable When replacing the connector block cover remember to locate the two nibs on the rear of the cover under the pcb before locating the screws in their respective bushes and tightening them down S NET TERMINATION The IMPs and S Net Interface in the host computer are high impedance devices whilst the S Net cable which interconnects them has a characteristic impedance of approximately 1000 Therefore to avoid signal reflections the S Net cable must be correctly terminated at both ends The way in which the S Net cable is terminated depends on where the Interface is placed in the S Net system The two possibilities are shown in Figs 4 8a and 4 8b IMP Connections CSB 3595 Installation Guide Issue RM La 1km maximum ______ __ ermination S NET S NET S NET S NET S NET terminated IN OUT IN OUT Host Computer a S Net terminations with the Interface at the end of the S Net I I re km maximum 9 I I termination termination S NET unterminated Host Computer b S Net terminations with the S Net Interface connected between two IMPs on the S Net Figure 4 8 S Net terminations Standard Solartron interfaces have a built in terminator which can be linked in or out of circuit as required The terminator is linked in circuit for the single ended configuration shown in Figure 4 8a but is not linked when the Inte
61. the measuring junction and the reference junction s should be of the same or similar metals as those used in the thermocouple A wide selection of temperature sensors is available to suit all measurement environments Full details can be obtained from the sensor manufacturers Most manufacturers will also provide you with detailed information on how to install and use your chosen sensor to get the most accurate results Sections 3 5 1 and 3 5 2 give basic guidance on the use of PRTs and thermocouples Using a PRT A PRT uses the principle that the resistance of a platinum wire varies predictably with temperature Therefore the connections made to the IMP 35951B are the same as those for resistance measurement The PRT is energized by the module s integral dc supply To ensure an accurate result four wire PRTs should be used The color coding of the leadwires shown in Figure A 11 is that recommended by the British Standard BS1904 1984 However not all manufacturers adhere to this standard so be careful If in doubt refer to the manufacturer s data sheet Do not use four wire compensated PRTs these have leadwires color coded blue blue red and white and are not suitable for use with the 35951B Measurement Techniques JWS 3595 Installation Guide Issue RA For a PRT to give a true indication of temperature it should be placed in good thermal contact with the substance being investigated Insertion probes shoul
62. three wire E TEMPERATURE Temperature is derived by measuring and linearising to IEC 751 the resistance of a platinum resistance thermometer PRT otherwise known as a resistance thermometer device RTD The linearisation within the IMP assumes that a 1000 PRT is used Four Wire PRT Many different color codes are used by the manufacturers of PRTs therefore a standard color code scheme cannot be defined However a general method of connection is shown in Figure 6 6 and this assumes that a 4 wire PRT is used 3 wire PRT s can be used but then I and H or I and L will have to be joined together at the PRT Note that the 4 wire method has greater thermal stability and enables a more accurate measurement to be obtained than the 3 wire method described in Section 3 3 2 PRT platinum resistance thermometer Fig 6 6 Temperature measurement connections four wire No Guard connection is needed as the circuitry associated with the I terminal automatically provides interference rejection as well as acting as current return IMPs 3595 1B Connector Blocks 3595 3B CSB 3595 Installation Guide Issue QF 3 3 2 Three Wire PRT The three wire method of connecting a PRT is sometimes preferred to the four wire method due to the saving in sensor cable cost The three wire method does however give a less accurate signal with reduced thermal stability than the 4 wire method An example of the three wire connection is shown in Fi
63. 0 000V Seel uri iaia 5 12mV Minimum load resistance scene eee eee eecaee eee ee eaaeeeeeeetaeeeeeaeeeeenaeeeeeea 10kohm LIMITS OF GITOE TEE 0 1 rdg 10mV Temperature coefficient eeeeceeeeeeeeeeneeeeeeeeenaeeeeenaeeeeeaes 0 01 rdg 1mV C Current Outputs le CC E OMA to 20 000MA Resolution irradia 10 25uA Output voltage compliance eeens 16V 1V at minimum current and 10V at maximum current Current output Wm 25mA Bt DER et EE 0 1 rdg 20uA Temperature coefficient i 0 01 rdg 2uA C C 12 Specifications for IMPs type 1A B C D E F G amp 2A B JWS 3595 Installation Guide Issue RF 6 General IMP and IMC Specifications Power supply tagliarla ea 10V to 50V d c Powert66d i se eee ia via S Net cable or IMP terminals Power consumption of each IMP lt 1 2W Results returned from all IMPs on S Net 1s IMP7to S3 EE 500V IMP to IMDB ee ecc me eve ai 500V min Analog to digital converter tenner eee eeeenaeeeeeeeetaeeeetaeeeetaeeeee 15 bits sign Analog scanner leakage currents at 25 C 3 C 3595 TAB tion bisi hdtv EEN lt 60nA CORRO EE lt 15nA Analog IMP channel crosstalk i gt 120dB Analog IMC channel crosstalk RH lt 50 ccecccsecceceeeesnteeeeeeesnaeeesesaeeesenes gt 120dB Analog IMC channel crosstalk Q RH lt 75 ii gt 100dB ADC input impedance al
64. 00kHz sampling Note whilst a lower sampling rate does not guarantee correct results when glitches are present it does increase the probability of obtaining correct results CSB 3595 Installation Guide Issue RP IMP 35952A Connector Block 35953C 8 7 6 MEASUREMENT PREPARATION Normally only two wires are connected to any group of IN OUT and COMMON terminals output to input from transducer transducer lt lt a as input b as output Fig 8 9 Connection Terminals Note that the connection terminals of a channel should be used either for an input transducer or for an output transducer not both Signals received from the input transducer may be coupled back to the output and if an output transducer is connected also produce an unexpected change 6 1 STATUS The purpose of status measurement is to ascertain the logic state of a signal Inputs are judged to be at logic 1 or logic 0 according to the selected input threshold levels Remember that a logic level between the selected thresholds may be interpreted either as logic 0 or logic 1 logic 1 logic 1 2 0V 9 0V Indeterminate Indeterminate 0 8V 3 0V logic 0 logic 0 a input thresholds with split pad shorted b input thresholds with split pad open circuit Fig 8 10 Input channel threshold levels The sampling rate can be selected from 20Hz 1kHz 10kHz or 100kHz 20Hz being the default setting Debounce is a
65. 1H and 1J but they are contained in standard IMP cases Both the 551H and the 551J use connector block type 3595 553J This has the same functions as a 3595 3J connector block but it has been re scaled to fit the standard IMP case The only difference in use is in the way the channel cable screening is grounded to conform with the EMC directive This is explained in Section 3 1 1 1 Universal IMP in Aluminium Case The construction of Universal IMPs in an aluminium case differs from that of previous IMPs although the general proportions are similar The case is an open ended aluminium box like structure At either end the case is closed off with diecast aluminium endcaps each secured with two captive screws A weatherproof seal between each endcap and the case is afforded by a conductive elastomer gasket The endcaps and case have a durable painted finish Inside the case the main pcb is attached to one endcap and is engaged in grooves that run the full length of the case Four LEDs on the pcb convey user reassurance information and are visible through windows in the endcap The main pcb can be removed for servicing by undoing the captive screws and sliding the pcb with its endcap away from the case Initially some effort may be required to separate the pcb from the 3595 3J Connector Block JWS 3595 Installation Guide Issue RM 3595 1H and 1J IMPs 12 3 1 2 The 3595 3J Connector Block fits with its attached endcap into the
66. 3B 6 13 3 4 4 6 14 Quarter Bridge gauge A quarter bridge strain gauge consists of a single active strain gauge at the measurement site The upper half of the bridge is replaced by the dual current supply of the IMP which leaves the final quarter of the bridge to be completed This done by connecting a dummy to the connector block The dummy may be either a precision resistor of the same value as the nominal gauge resistance or another unstrained gauge which then provides temperature compensation for the active gauge The quarter bridge system shown in Figure 6 14 uses a common dummy that is one that can be shared by any number of channels The IA and IB terminals supply the energisation currents whilst the H and L terminals measure the bridge out of balance voltage as each strain gauge is switched in Amplifier a maintains the bridge output L at the reference voltage and amplifier b maintains equal potentials at the lower ends of RG and Rp This method greatly reduces the cost of wiring and dummies A typical application for a quarter bridge shared dummy set up would be in measuring the strain in a series of supporting pillars Temperature compensation is effected by mounting the dummy strain gauge onto a piece of material identical to that of the pillars and physically adjacent to them energization currents Rai R i etc gt Pet reference S2 and ly terminals SK6 on the Connector Block are common to all
67. 5th order polynomial 2 3 4 wire Status TTL 3 9V volt free contact Status TTL 3 9V Frequency Period Counting Digital Output Note that 3 and 4 wire measurements use two channels All limits of error are for 1 year at 20 C 3 C B 2 Specifications for IMPs type 35951H amp J JWS 3595 Installation Guide Issue RN 1 Analog Status Channels 1 18 Number of analog channels sese 18 Channels 1 through 18 Switching tant eee ENEE EE reed relay three pole Re dstelay life ee ee Ee BEEN gt 10 operations Maximum signal measured eiia instaan aanas aaae aiara Hevesi EECH 12V Maximum input voltage i enin e nian nail noel Wadi niin alare 14V Overload protection Contimnuoug i 50V Maximum voltage between any two inputs 3595 RRE 200V e VER WEE 500V Common mode between IMPS 0 rrreeeeeeee nere rene reni 500V M T B F to MIL217E 64 000hrs IMP 69 000hrs IMC Measurement Voltage dc without optional connector eene 0 to 12V Current dc assuming 1000 shunt i 0 to 20mA Thermocouple types ciere euenit nr eno erai se B E J K N T R S Thermocouple Cold Junction e External or Automatic Thermocouple open circuit detection iii programmable Resistance 4 4 amp 3 Terminal cune aaa 0 to 2 5kQ Resistance Thermometer 4 amp 3 Terminal 1000 PRT Interfere
68. 81 2 1994 for emission and EN50082 2 1995 for immunity Note however that high levels of radiated or conducted radio frequency interference as defined in EN50082 2 may reduce the accuracy of low level measurements In such cases which are unusual in practice the interference can be mitigated by removing the source or by screening 3 ASSOCIATED DOCUMENTATION Listed below in Table 1 5 is the documentation available for the IMP system Full documentation is normally supplied with the system but extra copies can be obtained on request Table 1 5 IMP System Documentation Product No Manual Title Part No 3595 IMP Installation Guide 35952061 3595 Calibration of 3595 Series IMPs Operating Manual 35952233 3595 1F 1G Vibration IMP Programmer s Manual 35952200 3595 4A IBM PC S Net Adaptor Operating Manual 35952060 3595 4B IBM PC S Net Interface Operating Manual 35952232 3595 6A IMP DEC Q Bus Operating Manual 35952090 35957 IMP Q Bus RSX Driver User Manual 35952096 3595 7D VMS Fast IMP Q Bus Driver 35955018 3595 7E IMP IBM PC Advanced Language Drivers 35952157 3595 7F VMS Fast IMP Q Bus Driver 35952167 3595 71B 73B IMPULSE Data Acquisition Software 35952091 3595 74A IMPVIEW Operator Manual 35952245 3595 75A LabVIEW Bridge VIEW Drivers for IMPs User Guide 35952288 3595 8A GPIB RS423 IMP Interface 35952103 3595 93A B IMP Foundation Module 35952094 JWS 3595 Installati
69. A 5V 20mA power source is provided at the connector block for the energisation of such output devices as low power transducers and lamps The power supply is short circuit protected against overloads A typical arrangement of digital outputs with load energisation by the IMP SV supply is shown in Figure 8 20 Note the total load across the 5V out terminals should not be less than 2500 load relay coils contacts etc MODUS to other channel O Ps to COM of other channels configured Y as outputs Fig 8 20 Digital output with the load energised from the IMP CSB 3595 Installation Guide Issue RP IMP 35952A Connector Block 35953C 8 17 7 LED DISPLAY The four LEDs visible at the end face of the IMP convey certain user confidence information when illuminated They are allocated as shown in Table 8 6 Table 8 6 Meaning of the LED Display LED Meaning Comment 1 Power on O K 2 Not allocated 3 Event buffer full Lost events being counted 4 IMP scanning active O K 8 18 IMP 35952A Connector Block 35953C CSB 3595 Installation Guide Issue RP IMP 3595 2B Connector Block 3595 3F also covers IMC 3595 52B Contents 1 Input Output Channels eee ceeeeeeeeaeeeeceeeeeeeeeeeeeeaaeeeeceeeesaeeesaeeesaeeseaeeseseeeeaees 9 3 2 Internal e e UE e LEET 9 3 3 Logic Level Convention tee e ee e iano 9 4 4 Logic Threshold Levels Input Channels es 9
70. C CSB 3595 Installation Guide Issue RP 6 4 6 5 FREQUENCY AND PERIOD INTRODUCTION The IMP has five logic arrays each handling four input channels see Figure 8 3 and 8 4 For the reason that the timer counter section of each logic array is common to four channels only one frequency period measurement per logic array can be conducted at any one time If more than one channel of a logic array is programmed to measure frequency period then those measurements are conducted sequentially Thus if speed of results is important frequency period measurements should be distributed amongst the logic arrays in order to avoid or reduce measurement queuing This is particularly important if a scan all channels command is issued since all channels of all logic arrays must have completed their measurements before results can be released to the host The channels are allocated to logic arrays in the following blocks of four channels 1 to 4 channels 5 to 8 channels 9 to 12 channels 13 to 16 channels 17 to 20 Example Suppose that three channels are to measure frequency with a measurement time of 10 seconds the remaining channels being either unused or measuring status events If the three 10 second measurements were placed say on channels 1 to 3 more than 30 seconds would be required to complete a scan all channels command However if the three measurements were distributed between logic arrays say on channels 1 5 and 9 measurements w
71. Channels 2 4 6 8 10 12 14 16 and 18 Again the only channels on which a measurement result is obtained are Channels 1 3 5 7 9 11 13 15 and 17 3595 1H and 1J IMPs JWS 3595 Installation Guide Issue RM JWS 3595 Installation Guide Issue RM r r a Two wire r r resistance to be measured b Three wire L H GL e sE e not essential c Four wire CH 1 CH2 Figure 12 5 Example of resistance connections 3595 1H and 1J IMPs 12 11 4 5 TEMPERATURE MEASUREMENT RTD CHANS 1 18 Temperature measurements by an RTD resistance thermometer device rely on the predictable variation with temperature in the resistance of a platinum wire The IMP can work with three wire or four wire RTDs and the connections are exactly the same as for three and four wire resistance measurements See Figure 12 6 The IMP linearises temperature measurements by RTD to IEC 751 Linearisation can be selected either for a 100Q RTD or for a 10Q one a Three wire Rro b Four wire nro CH 1 CH2 Figure 12 6 Example of RTD connections Many different color codes are used by the manufacturers of RTDs therefore a standard color code scheme cannot be defined For the colour codes of a specific RTD refer to the manufacturer s specification The three wire method of connecting an RTD is sometimes preferred to the four wire method due to the saving in sensor cable cost The three wire method does however give a
72. Connect a grounding braid between the rack mounting frame and the cabinet use one of the grounding studs located at the rear of the frame on the side panels The frame is now ready for the universal IMPs to be fitted into it 5 3 FITTING THE UNIVERSAL IMPS INTO THE RACK Universal IMPs can be installed in the rack mounting frame with the connector block fitted The procedure is 1 On each IMP to be mounted in the rack securely attach a short length approx 150mm of grounding braid to the grounding stud Remove the back fascia strips from the rack mounting frame Slide each universal IMP into the rack mounting frame from the back engaging the flanges of the IMP case between the relevant pair of nylon guides Ensure that the grounding braid on each IMP remains protuding from the rear of the rack mounting frame When all IMPs have been installed in the rack screw the fascia strips back onto the rear of the rack mounting frame using the M3x5mm screws and crinkle washers removed in step 2 At the rear of the rack mounting frame attach the IMP bonding braids securely to the corresponding studs on the grounding fascia At the rear of the rack mounting frame complete the connections to each IMP in turn remove the connector block make the relevant connections and refit the connector block This will help to ensure that all connections are made correctly 5 4 REMOVING THE PCBS FROM RACK MOUNTED UNIVERSAL IMPS The connector b
73. Guide Issue RM Siting and Securing an IMP 2 5 a Length of cable v No of UIMPs 48V supply amp External PSU 3Amps max i 12AWG DAMM ii 16AWG 1 3MM iii 20AWG 0 5MM iv 24AWG 0 2MM No of IMPs 0 100 200 300 400 500 600 700 800 900 1000 Length m Length of cable v No of IMPs 48V supply amp External PSU 3Amps max 40 i eios RN EM ON EUN ME eren i T2AWG 24MM i d 16AWG 1 3MM a Pie A pei qui M 20AWG 0 5MM n dii a RW M 24AWG 02MM ME MA M NM c 0 100 200 300 400 500 600 700 800 900 1000 Length m Figure 2 2 Minimum recommended wire gauge for a 48V power supply for a Universal IMPs and b other IMPs JWS 3595 Installation Guide Issue RM 2 6 Siting and Securing an IMP 3 1 3 2 POWER SUPPLY UNITS IMP POWER SUPPLY UNITS CAUTION The 3595 95A B and D units are all configured for 240VAC input by the manufacturer They must be adjusted for the local mains supply voltage where necessary The 3595 95A power supply unit is a48VDC power supply designed for installation at the host end of the network It will supply 140 Watts providing adequate power for a worst case system with 50 IMPs on a single network It is a ventilated unit and must therefore be fitted in a protective enclosure Users must comply with the installation instructions supplied with the unit The 3595 95B power supply unit is designed for installation at the remote end of an S
74. H and 1J are given in Chapter 12 For IMPs type 35951C and 35951E an optional connector block 35953D is available with built in attenuators These permit higher voltages to be measured Note The molded rubber protector supplied with each IMP should be fitted to the edge connector of the connector block whenever it is removed from the IMP If required additional environmental protection can be provided for the connector block by fitting a dummy IMP case 359592 A WARNING Several IMP types are capable of withstanding up to 500 volts between input channels This means that potentially lethal voltages sourced from the sys tem being monitored may be present on the connector blocks To ensure operator safety extreme care must be taken to isolate high voltages from the connector block whenever channel connections are being altered CSB 3595 Installation Guide Issue RM IMP Connections 4 3 2 CABLE ENTRY SEALING To maintain the environmental specification all connections to the IMPs must be properly sealed Protective rubber boots Figure 4 1 are provided for this purpose and the teats on these should be cut to a length such that leads passed through them are firmly gripped thereby forming a seal Tip of teat cut off to allow insertion of connecting lead Note that on multiple teat boots you may use one or more teats as re quired by the type of lead in use Do not however cut unused teats Figure 4 1 Sealing the IMP
75. IMP MoOUntilig E 1 5 2 9 IMP Gonnections remet ento Perret nt rn ete Led iei oi 1 6 2 4 EMG intent atten ut rre ipee itu utenti ierra 1 7 3 Associated Documentation i 1 7 List of Figures Figure 1 1 Example of IMP System iii 1 2 List of Tables Table 1 1 3595 Interface Modules eene nnne enne 1 3 Table 1 2 er 1 4 Table 1 3 VIMP Functions iii ianea aa aeina ia aaea a a a eain a Dai 1 4 Table 1 4 IMP IMC Equivalents iii 1 6 Table 1 5 IMP System Documentation ii 1 7 JWS 3595 Installation Guide Issue RM Introduction 1 1 HOST e g Personal Computer RACK MOUNTED IMCS DISTRIBUTED IMPS S NET Network 1 RACK MOUNTED IMPS DISTRIBUTED IMPS S NET Network 2 Figure 1 1 Example of IMP System 1 2 Introduction JWS 3595 Installation Guide Issue RM 1 THE IMP SYSTEM The 3595 series of Isolated Measurement Pods IMPs are multi channel data collecting stations designed to be remotely operated by a host computer or data logger The host is linked to the IMPs by the S Net cable which is a simple two wire cable of up to 1 5km 4950 feet in length The S Net cable is used to convey data to and from the host and may also be used to convey power to the IMPs An example of an IMP system is shown in Figure 1 1 This example is not necessarily typical but it shows the various ways in which IMPs may be used To communicate via S Net with the IMPs the hos
76. JWS 3595 Installation Guide Issue RA With IMP type 35951B three nominal measurement ranges are available 250 2500 2 5kQ and autorange A current drive of 0 8mA is automatically supplied by the IMP via the I and and I terminals On all ranges the results are output in kohms Resistance can be measured using the four wire or three wire method The four wire method is the more accurate of the two and has greater thermal stability Figure A 3 Resistance mesurement connections four wire The connections for the four wire method are shown in Figure A 3 To avoid errors due to lead resistance the wires from the H and L terminals should be connected as close as possible to the body of the unknown resistance No guard connection is needed the circuitry associated with the I terminal automatically provides interference rejection as well as acting as current return The connections for three wire resistance measurement are shown in Figure A 4 This method is sometimes preferred because three core cable is cheaper than four core Figure A 4 Resistance measurement connections three wire By using both current sources the three wire method compensates for the resistance of the wires between the H and L terminals and the unknown resistance as shown by the following equation VrzI rr tr lk rytr Lor This method does however rely on currents I and I being exactly the same and on wires a and b Figure A 4 being identical T
77. L 0 04 fs 2 5kQ 250mQ 0 02 rdg 0 03 RL 0 04 fs 1 25ms 1 04ms Integration time Range Sensitivity Limits of Error 250 10mQ 0 03 rdg RL 96mQ 2500 100MQ 0 03 rdg RL 0 16 fs 2 5kQ 1 00 0 02 rdg 0 03 RL 0 16 fs Resistance Thermometer Device Conformity for 1000 PRT RTD is to IEC 751 Temperature coefficient ii lt 0 03 0 002 RL C per C The error introduced by the single lead resistance RL is an additional error which applies only to three wire configurations Any lead resistance imbalance should be added to the error in three wire configurations 20ms 16 67ms Integration time Range Sensitivity Limits of Error 200 to 490 C 0 1 C 0 4 0 1 RL C 490 to 600 C 0 1 C 1 2 0 1 RL C 5ms 4 17ms Integration time Range Sensitivity Limits of Error 200 to 490 C 0 1 C 0 6 0 4 RL C 490 to 600 C 1 0 C 3 7 0 4 RL C UWS 3595 Installation Guide Issue RF Specifications for IMPs type 1A B C D E F G amp 2A B C 7 1 25ms 1 04ms Integration time Range Sensitivity Limits of Error 200 to 490 C 0 4 C 1 7 1 6 RL C 490 to 600 C 4 0 C 14 14 1 6 RL C Strain Repeatability at constant temperatures over 24 hours is 2ue for all configurations Figures are for 120Q gages with gage factor 2 Measurement range for figures quoted is 0 to 10 000ue 20ms 16 67ms Integration time Type Limits of Error Temperature Coefficient Full bridge
78. ON The IMP is shown schematically in Figure 6 2 and consists basically of a the microprocessor b a logic array to handle network communications c aninput multiplexer to switch through the ten channels d an Analogue to Digital Converter ADC The ADC in the IMP is of the Solartron pulse width type The integration measurement time has a default value of 20ms which automatically tends to cancel out interference derived from 50Hz mains supplies For those countries using 60Hz supplies the integration time can be set to 16 66ms by command from the host channel 1 o channel 2 o Analogue Communications Multiplexer I channel 100 Supervisory Micropr r STOPIRESSRO DC supplies Fig 6 2 Schematic of the IMP operation IMPs 3595 1B Connector Blocks 3595 3B CSB 3595 Installation Guide Issue QF 3 MEASUREMENT PREPARATIONS 3 1 VOLTAGE Connect the unknown voltage to the H L and G terminals as shown in Figure 6 3 The terminals I I and I are unused For protection against electrical interference connect the G terminal as shown The guard terminal must not be left disconnected since it forms an integral part of the measuring circuitry e unknown voltage alternative guard connection Fig 6 3 Voltage measurement connections Three nominal measurement ranges are available 20mV 200mV 2V and autorange 3 2 RESISTANCE Resistance can be measured using the four wire or three wire method No
79. Quarter Bridge channels S2 gt ILE L e Fig 6 14 Quarter bridge shared dummy measurement circuit IMPs 3595 1B Connector Blocks 3595 3B CSB 3595 Installation Guide Issue QF Initialization On initialization the IMP switches off I and measures the gauge voltage Vg The IMP s microprocessor uses the following algorithm to calculate strain m Vx Vo GVg In pstrain Vx Vo 1 0 E GVg where VO initial out of balance voltage Vg gauge voltage at initialization Vx strained out of balance voltage G gauge factor The quarter bridge measurement connections for use with an remote dummy i e remote from measurement site at connector block are shown in Figure 6 15 A 1200 0 196 resistor is supplied with the IMP to effect bridge completion when 1200 gauges are used Note that the S2 and Ip terminals are shared by all quarter bridge channels of the IMP Note screen of cables connected inside connector block only Next 3 Channel Channel 2 Channel 1 4 Inside connector block 39 t Outside connector block 3 Fig 6 15 Quarter bridge measurement connections with remote dummy CSB 3595 Installation Guide Issue QF IMPs 3595 1B Connector Blocks 3595 3B 6 15 The quarter bridge measurement connections for use with a local dummy i e at measurement site are shown in Figure 6 16 Note screen of cables connected inside connector block only Next
80. Rate 20Hz 5 s 200ms 1KHz 100 s 4ms 10kHz 100 s lms 100kHz 100 s lms default value Debounce is applied to 20Hz and 1kHz sampling With debounce an event is considered to be valid only after four successive samples have shown the input to be at the same level see Figure 8 7 Therefore with 20Hz and 1kHz sampling events are not captured until some time after they have occurred that is captured events have been subject to delay The actual delay is 200ms for 20Hz sampling and 4ms for 1kHz sampling If these delays are large enough to be significant results received by the host must be adjusted accordingly Input threshold levels apply as illustrated in Figure 8 10 Note To ensure that a logic transition is recorded it must pass through the indeterminate region from one logic state to the other as shown in Figure 8 12 a logic 1 or logic 0 Indeterminate logic 1 or logic 0 Indeterminate logic 0 a ve transition guaranteed to be recorded b Either no transition or ve transition recorded Fig 8 12 Logic Transitions IMP 35952A Connector Block 35953C CSB 3595 Installation Guide Issue RP 6 3 COUNT EVENTS This facility permits a number of events as defined in Section 6 2 to be counted The events transitions to be included in the count can be ve ve or both Two types of count are offered increment or totalise The general way it operates is as f
81. Resolution 10s 0 1Hz ls 1Hz 100ms 10Hz 10ms 100Hz It is essential to use a measurement time that is adequate for the expected input frequency For example when measuring 2Hz period 500ms there is no point in using a measurement time of 100ms since only 20 of the input signal would be seen A better measurement time to use 10 seconds which measures for 20 complete cycles 6 6 PERIOD Time periods single pulses or whole cycles can be measured from 20us up to 25s longer periods can be measured with Event Capture Several sampling rates are provided as shown in the table below debounce being incorporated in the 20Hz and 1kHz rates When selecting the sampling rate ensure that the period of the input signal does not drop below the corresponding minimum input period in the table or an incorrect measurement will result 8 14 IMP 35952A Connector Block 35953C CSB 3595 Installation Guide Issue RP Table 8 5 Minimum Input Period amp Result Resolution v Sample Rate Sample Rate Min Input Period Event Resolution 20Hz 400ms 50ms 1kHz 8ms lms 10kHz 200us 100us 100kHz 20us 10us default value The minimum input period that can be measured with a given sampling rate depends largely on the mark space ratio of the input signal The minimum input period 400ms 8ms and so on can be measured only if the mark space ratio is 1 1 Any deviation from 1 1 in either direction will increase the minimum measura
82. SP1 in connector block 35953E sss 7 5 Figure 7 4 Voltage output connections iii 7 7 Figure 7 5 Connections for IMP supplied current iii 7 7 Figure 7 6 Connections for externally supplied current sink sss sse 7 7 Figure 7 7 Connections for externally supplied current source 7 8 Figure 7 8 Example increasing the effective load with a series resistor sess 7 8 JWS 3595 Installation Guide Issue RA IMP 3595 1D Connector Block 3595 3E 7 1 List of Tables Table 7 1 Output Default States i 7 5 Table 7 2 Meaning of the LED Display 7 9 7 2 IMP 3595 1D Connector Block 3595 3E JWS 3595 Installation Guide Issue RA 1 INTRODUCTION The 35951D Analog Output IMP has four channels of isolated analog output Each channel has two sets of outputs one for voltage in the range 10V to 10V and the other for current in the range OmA or 4mA to 20mA The basic circuit of an analog output channel is shown in Figure 7 1 15V floating CURRENT Krug STOUT output E IN control OV floating Figure 7 1 Basic circuit of the output stage of an analog output channel On each channel the voltage and current outputs are always both active and are interdependent For example should a voltage change be requested with the CHnVOx command then the current through a load connected across the current terminals would change also The
83. Siting and Securing an IMP JWS 3595 Installation Guide Issue RM 1 IMP SITING OPTIONS Depending on your system monitoring requirements IMPs may be sited in any one of three ways e Individual IMPs of any type may be distributed throughout the system e n established plants where sensor outputs are already channeled to a central measuring point some IMPs types 1A through IP 2A and 2B may be neatly housed in a rack VIMPs Vibration IMPs type TE and 1G are always distributed throughout the system Universal IMPs types TH and 1J also are primarily intended for distribution around the system but if necessary they can be stacked on each other e Jnaclean area a high density of isolated measurement channels can be obtained by using IMCs Isolated Measurement Cards These perform the same functions as IMPs type 1A through 1E 2A and 2B but they are not enclosed in a protective case To meet European standards for EMC the IMCs must be installed in a suitable enclosure for example the VERO IMRACK 3400 Securing instructions for each of these options are given in Sections 2 3 and 4 JWS 3595 Installation Guide Issue RM Siting and Securing an IMP 3 3 SITING AND SECURING INDIVIDUAL IMPS When distributing IMPs throughout the system choose installation sites that are relatively free from moisture vibration and corrosive substances If a damp installation cannot be avoided mount the IMPs verti
84. Step 2 do this now The positions of the eleven M5 screws are indicated by the letter B in the following diagram B e O Grounding point B 10 10 VIMPs 3595 1F G Connector Block 3595 3G JWS 3595 Installation Guide Issue RN Lift the outer half shell of the VIMP input card housing away from the VIMP assembly Take care not to damage the neoprene bonded cork gasket this may adhere to both half shells if so use a thin bladed screwdriver or palette knife to ease the gasket away from the face of the half shell you intend to remove Take care also not to lose the bag of desiccant which rests on the input card or either of the two nut plates that are used to secure the connector block neoprene bonded cork gasket MW JUMPERS IT HHHH HH HA Cu 5 1 2 Accessing the Jumpers in the 35951G VIMP The procedure for accessing the jumpers in the 35951G triple case VIMP is as follows 1 Take each 35953G Connector Block in turn undo the knurled nuts securing the block and withdraw it from the VIMP assembly Loosen the bolts securing the VIMP to its installation point If the VIMP is bonded to ground through the VIMP case through the point indicated in the diagram following Step 4 use an M4 nut spinner to remove the nut and star washer securing the ground lead and remove the lead from the VIMP Lift the VIMP clear of the installation point and l
85. TA IMPs are available for measuring both analog signals and digital signals Digital signals are read directly into the logic circuitry of a 35952A IMP Analog signals however are converted into digital form by an Analog to Digital Converter ADC within the 35951A B C or E IMP Analog signals represent a continuously variable physical quantity Some quantities such as voltage and current may be measured directly whilst others such as temperature and strain must be converted to electrical form with a transducer Typical transducers are thermocouples and platinum resistance thermometers PRTs for temperature monitoring and resistive elements connected into a bridge circuit for strain gauging Digital signals are those that are switched between two distinct logic states for example 5V for logic 1 and OV for logic 0 This type of signal is often derived from switch contacts on the system being monitored and represents status and event conditions These signals may be monitored singly or in groups and compared with preset conditions Other digital signals may be pulse streams whose repetition rate is proportional to a physical quantity typical transducers that output such signals are flowmeters and shaft speed indicators JWS 3595 Installation Guide Issue RA Measurement Techniques A 3 3 MEASUREMENT CONCEPTS For each type of measurement that an IMP can make this section introduces you to the simple theory behind it
86. Table 10 5 RS232 Cable Connections esses eene eene nennen nnne nnne ens 10 20 10 2 VIMPs 3595 1F G Connector Block 3595 3G JWS 3595 Installation Guide Issue RN 1 VIMP OVERVIEW VIMPs are IMPs that can measure vibration and they are available in two versions the 3595 1F and the 3595 1G The 3595 1F can measure vibration on up to 16 channels and each measurement can be synchronized with any one of four trigger inputs there is also an event input that can select a VIMP program in accordance with a critical machine state and an alarm output The 3595 1G is similar to the 3595 1F but has 32 vibration input channels eight trigger inputs one event input the same and two alarm outputs Each type of VIMP may be programmed from the Host Computer for a number of vibration measurement tasks The 3595 1F is housed in a dual IMP case whilst the 3595 1G is housed in a triple IMP case A detachable connector block the 3595 3G contains the screw terminals through which all connections are made and the VIMP address switches the 35951F embodies one such connector and the 35951G two User configureable jumpers plug in wire links on the analog input cards provide for the selection of the range and coupling for each vibration input channel and for the coupling of each trigger input The jumpers are accessed by opening part of the VIMP assembly 1 1 VIMP POWER SUPPLIES A VIMP is powered from two sources S Net conveys power
87. Tz Switches OUT e 7 fe Si I S NET OUT Ss Ge Figure 4 5 S Net terminals power terminals and IMP address switches CSB 3595 Installation Guide Issue RM IMP Connections 4 7 3 2 4 8 The 359552B IMC differs from the other modules by using a 9 way D Type connector for the S Net rather than the connector block The S Net connections made to the D Type connector are shown in Figure 4 6 Ext ve Not Used Not Used Not Used Not Used S Net ve Screen S Net ve Figure 4 6 S Net connections for the 2B The voltage delivered to the IMP can be measured across the and terminals but this should be done only during setting up since a voltmeter can impose an undesirable load on the rest of the network IMPs are multi dropped from the S Net cable as shown in the example in Fig 4 7 Polarity must be strictly observed that is the to to and S screen to S connections must be maintained throughout the network No universal color coding scheme can be specified for connecting the IMPs as the colors may vary according to the type of cable being used The colors shown in Figure 4 7 are those of the Belden 8641 cable supplied by Solartron Note that the S Net cable should have a minimum length of 500mm 20 inches between IMPs and 1 metre 39ins between VIMPs Minimum of 500mm between IMPs and 1m between VIMPs Internal Figure 4 7 Multi dropped connections of IMPs from
88. a resolution of 10s The minimum input period that can be measured depends largely on the mark space ratio of the input signal The minimum input period 20us can be measured only if the mark space ratio is 1 1 Any deviation from 1 1 in either direction increases the minimum measurable input period as shown in Figure 12 15 6 5 increase in minimum 4 measurable period 3 100 2 0 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 1 10 1 mark space ratio or vice versa Figure 12 15 Effect of mark space ration on minimum measurable period Periods Examined When measuring cyclic waveforms the number of cycles periods to be included in a measurement can be selected as 1 10 100 or 1000 There are two main benefits in considering larger numbers of periods e The already small measurement uncertainty 1 bit inherent in all digital measurement systems becomes insignificant e Many signals exhibit some frequency or phase shift mains derived signals for example no matter how small In this case the measurement result required is probably one that represents the average value of the input period The only way to obtain this is to cover as many periods as is practicable that is 1000 periods Note that the measurement of cyclic signals starts and stops with the ve edge of the signal as shown in Figure 12 16 JWS 3595 Installation Guide Issue RM 3595 1H and 1J IMPs 12 19 ve edge ve edge Figure 12 16 Measurement of 10 periods
89. able This is due to the relatively high voltage backing a 4mA to 20mA loop In parallel instrumentation there are generally two scenarios e The IMP channel is connected to an existing measurement circuit which has a sensor already connected to it for example a chart recorder e Two IMP channels usually from different IMPs are connected to the same sensor for redundancy purposes In these two cases an error voltage is developed which is a product of the second instrument s input leakage current and the sensor impedance 5 1 INPUT LEAKAGE CURRENT Input leakage current rather than input impedance is the best parameter to use when considering the effect of one instrument s input circuit on that of another Leakage current is a function of the input impedance of a measuring device but there are other factors for example input amplifiers and multiplexer circuits in particular Therefore the fact that an ADC has a high input impedance in the order of GO often has little bearing on the actual input leakage However if the precise value for the leakage current is not available then the effective leakage current may be estimated by dividing the measured voltage by the ADC input impedance For example with a thermocouple output of around 200mV and an ADC input impedance of 100M the leakage current approximates to 20nA The input impedance of the ADC within an analog IMP is 10GQ but this is degraded by the multiplexer circuitry
90. al switch contacts do not require a voltage energisation source contact wetting since their resistance is measured by the IMP or IMC Any switch input has a maximum input current of 80LA sourced from the IMP or IMC If existing switch contacts are already energised they are measured as voltages automatically If a group of switch contacts are wired with a common return wire associated common terminals of the IMP or IMC should be connected together 6 1 IMC CONNECTIONS Connections to the IMC are made through three connectors PL 1 PL2 and PL3 The connections are detailed in Figures 9 5 and 9 6 PL1 is used for the connections to S Net PL2 is used for inputs I1 118 and PL3 is used for inputs 119 132 and outputs 029 032 WARNING Where only one of the two 37 way connectors is fitted there may be a risk of high common mode voltages at the unused connector For this reason the covers supplied with the IMC must be fitted to unused connectors Ext ve Ext ve Not Used Not Used Not Used Not Used S Net ve Sien S Net ve Fig 9 5 Pin functions of the S Net connector JWS 3595 Installation Guide Issue RQ IMP 3595 2B Connector Block 3595 3F 9 5 6 2 6 3 9 6 Not Used Input 118 Input 117 Input 116 Input 115 Input I14 gt gt gt Input I3 gt Input 2 Input Ill Input IO Input I9 Input I8 Input I7 Input 16 Input I5 Input I4 Input I3 Input I2 Input I1 Common C18 Common C17
91. and guides you in using the technique best suited to your application 3 1 VOLTAGE MEASUREMENT The ADC of a 35951A B C or E IMP responds to dc voltages Therefore dc voltages and transducers which produce dc voltage outputs may be measured directly Other electrical quantities current and resistance are measured indirectly as described in Sections 3 2 and 3 3 3 2 CURRENT MEASUREMENT A dc current i is measured by passing it through a resistor of known value r By Ohms law the voltage v developed across the resistor is directly proportional to the current See Figure A 1 This allows the value of current i to be computed from the simple equation i v r Current can be measured by IMPs type 35951A C or E Assuming that the value of the known resistor is 1009 the range of dc current measured is OmA through 20mA r V ixr Figure A 1 Principle of current measurement For channels that are to measure current a 100Q precision resistor must be fitted to the appropriate terminals of the connector block See Chapter 5 for details 3 3 RESISTANCE MEASUREMENT The resistance r of an external resistor is measured by passing a constant energizing current of known value i through the resistor and measuring the voltage developed across it Again from Ohms law the resistance r is computed from the equation rzv i See Figure A 2 r V ixr Figure A 2 Principle of resistance measurement A 4 Measurement Techniques
92. and single measurement are each preceded by a bookmark and time tag The historical mode is used in conjunction with a FIFO first in first out buffer in the IMP memory Should communication fail on S Net the IMP is able when operating at one scan a second to store measurement data for approximately five minutes When communication on S Net is re established the IMP is able to output the stored data quickly to the Host on a lengthened Stream 2 e Save and Restore control database e Hardware and Software watchdogs with output from Channel 20 e Auto start after a power up or hardware watchdog timeout e Firmware upgrade without IMP disassembly using flash memory technology The commands and responses for the above facilities are described in Part 2 of the Operating Manual for your particular S Net Interface 12 4 3595 1H and 1J IMPs JWS 3595 Installation Guide Issue RM 2 CHANNEL FUNCTIONS Each of the 20 channels in a 1H and 1J IMP can be set to measure a wide variety of input signals However setting up a channel to measure a specific signal is a two fold process First you must make the appropriate connections to the channel input as described in Section 4 of this chapter and then the relevant commands must be issued from the Host to define the channel mode IMP commands are described in Part 2 of the Operating Manual for your particular S Net Interface Channels 1 through 18 can each be set to measure any of the
93. ansion Differential expansion occurs where the change in dimension with temperature of the surface being monitored is different to that of the gauge A temperature rise for example could cause the surface being measured to expand by a greater amount than the gauge would naturally expand Since the gauge is bonded to the surface it is forced to expand by the same amount and therefore gives a false indication of strain This effect can be compensated for in two ways a by bonding the complete bridge to the surface being measured in the same temperature environment b by using temperature compensated gauges In a compensated gauge it is arranged for the resistivity of the gauge material to have a negative temperature coefficient so that a possible increase in resistance due to stretching by differential expansion is cancelled out by a drop in resistivity of the gauge material Temperature compensated gauges are designed for use with specific materials such as stainless steel mild steel and aluminium Variation in Gauge Resistance The resistivity of all strain gauges tends to vary with temperature this effect being greater in semiconductor gauges than in metallic ones Thus a change in temperature may alter the gauge resistance to give a false strain reading To compensate for this all elements of a strain gauge bridge should have the same temperature coefficient and be maintained at the same temperature To minimize heating of the ga
94. aptive knurled screws and can be conveniently removed from the IMP for connections to be made Simply undo the two securing screws initially using a broad bladed screwdriver to untighten the screws and withdraw the connector block from the IMP casing Access to the connection terminals inside the block is obtained by removing the two cover securing screws and lifting the cover clear The RS232 connections to be made to the Serial IMP are as follows DTR GND TXD RTS RXD CTS O P O P O P VP I P Note that this diagram shows the RS 232 connections as they apply at the IMP For example RTS O P is the Ready To Send output of the IMP and CTS I P is the Clear To Send input Details of the S Net connections and of the IMP address switches S1 and S2 are given in Chapter 4 of the Installation Guide Once the connections have been made replace the connector block cover and secure with the two securing screws Then insert the connector block into its recess in the VIMP casing and screw in the two knurled screws The knurled screws may be turned initially with the fingers but should finally be tightened with a broad bladed screwdriver CSB 3595 Installation Guide Issue QF Serial IMP 3595 93D Connector Block 3595 3H 11 3 11 4 Serial IMP 3595 93D Connector Block 3595 3H CSB 3595 Installation Guide Issue QF IMP 3595 1H and 1J Connector Block 35953J Contents
95. ar of mounting frame Siting and Securing an IMP JWS 3595 Installation Guide Issue RM WARNING To reduce the possibility of electrical shock take the following precautions e Install the IMC mounting frame in an enclosure e g a cabinet and fit blank panels in any unused IMC positions Also ensure that IMCs can not be accessed from the top or bottom of a mounting frame Connect the mounting frame to ground through the grounding pillar Both the mount ing frame and the enclosure in which it is mounted must be grounded The design of the enclosure will determine the EMC performance of the system Connector card support assembly eo 484mm Grounding pillar positions 482mm Measurement card support assemblies Numbers facing inwards on front bar S3 5 e ear Figure 3 11 Assembly of IMC mounting frame Siting and Securing an IMP 3 13 JWS 3595 Installation Guide Issue RM __ _ __ _ __ __t4 db S 3595528 Measurement Card g ca 188 9 bum Location of power source Links Z anc and Ham E All dimensions in mm The external dimensions of each IMC with the connector card plugged into the measurement card are shown in Figure 3 12 Figure 3 12 IMC Dimensions Measurement Card 188 9 2174 Location of power source Links LK503 and LK502 Figure 3 13 359552B IMC Dimensions 4 2 FITTING IMCS The two parts of each IMC are installed s
96. are to be powered from the host then the length of the S Net cable that can be used is determined by the number of IMPs connected to S Net the cable gage and the power supply voltage Where IMPs are powered locally of course this limitation does not apply The limitation never applies to VIMPs which are always powered locally A further limitation on cable length is imposed by signal attenuation due to the cable impedance This is the only limitation imposed for locally powered IMPs but it also applies for remotely powered IMPs where permitted within the limitation mentioned in the previous paragraph With the standard recommended cables the maximum permitted length is 1Km A low loss 18 gage AWG cable is also available which permits a maximum cable length of 1 5km When choosing the type of cable and power supply bear in mind any future expansion of the system Details regarding the choice of S Net cable and IMP power supply unit are given in Chapter 2 of the manual Further details regarding the connections to be made to the power supply units are given in Chapter 4 IMP MOUNTING IMPs may be mounted according to the layout of the monitored system and the measurement data requirements Typically IMPs are distributed around the system each IMP being mounted close to the sensors that it is to monitor Thus sensor leads can be kept short which is less costly and minimizes noise pickup In large systems there may be many sensors
97. arted on receipt of the next measurement trigger The maximum number of events that can be recorded per channel by the event counting circuitry is 16 777 215 after which the count continues from zero No other indication of this is given 4 7 4 1 Maximum Count Rate The maximum count rates obtainable when using one channel is shown in Table 12 3 with events counted on both channels the rate is slightly lower Table 12 3 Count Rate v Sample Rate Sample Rate Max Count Rate using one channel 20Hz 1kHz 10kHz 100kHz 2 4 s 124 s 4900 s 15000 s default value Debounce is applied to 20Hz and 1kHz sampling With debounce an event is considered to be valid only after four successive samples have shown the input to be at the same level With 20Hz 1kHz and 10kHz sampling the maximum count rate can be obtained only if the mark space ratio of the input signal is 1 1 With 100kHz sampling the maximum count rate can be obtained with a mark space ratio of between 1 1 and 5 7 1 or vice versa Any deviation in these mark space ratios lowers the maximum count rate as shown in Figure 12 13 The sharp step in the case of 100kHz sampling is due to software constraints JWS 3595 Installation Guide Issue RM 3595 1H and 1J IMPs 12 17 100 i 100kHz 80 I I I Event 60 L 20Hz 1kHz 10kHz sampling count I rate f 4 of max 0 1 20 0 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1
98. asurements JWS 3595 Installation Guide Issue RF Specifications for IMPs type 1A B C D E F G amp 2A B C 13 7 35951F G Vibration IMP Specification INPUTS Number of channels 399514 Fs rei eri es 32 vibration 8trigger 359510 ia bai 16 vibration 4trigger Voltage protection nemen 150V peak to peak Maximum input ad 20V Vibration Inputs Input impedance eer ttg tete Mene atrata 1MO RANGES lee sitate dh etie fem ia 20mV to 10V 9 ranges ICP interface iu ciere ridi 4mA 24Vdc configurable per channel renes IE AC DC configurable per channel elen D 1st order 0 4Hz cut off AC highpass filters a aeeaaa eenaa 10Hz or 70Hz 2nd order 2Hz 4th order ADC Resolution corre Ee ta ella 16 bit Channel crosstalk essiensa i manosa taraen aeaaaee ea 50dB dc 1kHz Channel accuracy dc coupled Amplitude 3 up to half baseband freq RMS Overall in 3 5 0 4 FSR Harmonic distortion 500B typical up to half baseband freq Acquisition modes Free run externally synchronized event triggered Envelope fiters 5 Re Lera aiuole Zeie 8th order RANGES fe eee rs 1 25 2 5 2 5 5 5 10 10 20kHz Does not apply to 20mV range or 20kHz bandwidth Trigger Inputs le Program assignable to any vibration input Elle lat KEE AC DC configurable per channel ele TE ve or ve TYDOS a a litoranea ilaria Analog level in the range
99. at each measurement point and possibly established sensor channels In this case several IMPs may be mounted together in a rack In a clean area where a particularly high density of measurement channels is required IMPs can be rack mounted in the form of IMCs Isolated Measurement Cards IMCs are simply IMPs without their cases For each type of IMP an IMC version is available The product numbers of the IMP and IMC equivalents are shown in Table 1 4 JWS 3595 Installation Guide Issue RM Introduction 1 5 2 2 1 2 3 1 6 Table 1 4 IMP IMC Equivalents Description IMP Type Con Type IMC Type Con Type 20 Channel solid state 3 pole 35951A 35953A 359551A 359553A 10 Channel solid state 3 pole 35951B 35953B 359551B 359553B 20 Channel reed relay 3 pole 35951C 35953A 359551C 359553A 20 Channel high voltage 35951C 35953D 359551C 359553D 4 Channel analog output 35951D 35953E 359551D 359553E 20 Channel reed relay 3 pole 35951E 35953A 359551E 359553A 20 Channel high voltage 35951E 35953D 359551E 359553D 20 Channel digital input output 35952A 35953C 359552A 359553C 32 Channel switch input output 35952B 35953F 359552B Rack Mounting frame 359591A 359591B Up to 14 IMCs can be fitted in the appropriate rack 359591B IMCs function in exactly the same way as IMPs but because they are not protected from their environment by the casing some performance figures cannot be guaranteed
100. available from W W Fischer The connections to be made to the mating plug are listed in Table 10 2 The numbering of the mating plug pins is shown in Figure 10 4 Table 10 5 RS232 Cable Connections Mating Plug for VIMP Receptacle 9 way D Type Socket Pin No Function Pin No 1 Not used 2 Not used 3 RXD input 3 4 TXD output 2 5 Not used 6 Not used 7 GND 5 Screening Braid Shell Note that Table 10 2 gives the RS232 functions as they apply at the VIMP i e pin 3 is the RXD input to the VIMP and pin 4 the TXD output from the VIMP 10 20 VIMPs 3595 1F G Connector Block 3595 3G JWS 3595 Installation Guide Issue RN Location Sleeve Fig 10 5 Pin numbers of RS232 mating plug rear view 7 2 SELECTABLE VIBRATION AND SYNC INPUTS Three BNC connectors on the Local Setup Panel provide for the monitoring of a selectable vibration input and a selectable sync input The connector functions are as follows NODE A This connector carries the buffered signal from the input signal path Whichever channel is or was the last to be selected has its signal available at this point The node can be monitored during commissioning to check that the correct range selection has been made for the selected channel SYNC This connector carries the sync output and allows a selected sync input to be monitored There are four sync channels on a 35951F and eight sync channels on a 35951G Whichever channel
101. ay it on its mounting brackets in a convenient working space Remove the eleven M5 socket head screws that secure the half shell at the top of the VIMP assembly to the half shell at the bottom For this you will need a 4mm Allen key If you have not aready removed the M4 nut and star washer mentioned in Step 2 do this now You must also remove an M4 nut and star washer from an identical position on the bottom half shell The positions of the eleven M5 screws are indicated by the letter B in the following diagram B B B B B Grounding point JWS 3695 Installation Guide Issue RN VIMPs 3595 1F G Connector Block 3595 3G 10 11 5 To access the jumpers for channels 1 through 16 lift the top half shell away from the VIMP assembly alternatively to access the jumpers for channels 17 through 32 turn the assembly over onto its opposite face and lift the base half shell away from the VIMP assembly To avoid damage to the input cards remove only one half shell at a time do not rest the VIMP on the input card components Take care not to damage the neoprene bonded cork gaskets a gasket may adhere to both half shells if so use a thin bladed screwdriver or palette knife to ease it away from the face of the half shell you intend to remove Take care also not to lose either of the two bags of desiccant or any of the four nut plates neoprene bonded cork gaskets _ 1 E JUMPERS for channels 1 through 16
102. ble input period as shown in Figure 8 16 6 5 increase in minimum 4 measurable 3 period 100 2 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 1 10 1 mark space ratio or vice versa Fig 8 16 Effect of mark space ratio on minimum measurable period 6 6 1 Periods Examined When measuring cyclic waveforms the number of cycles periods to be included in a measurement can be selected as 1 10 100 or 1000 There are two main benefits in conside ring larger numbers of periods a The already small measurement uncertainty 1 bit inherent in all digital measurement systems becomes insignificant b Many signals exhibit some frequency or phase shift for example mains derived signals no matter how small In this case a measurement result will probably be required that represents the average value of the input period The only way to obtain such an average is to take into account as many periods as is practicable that is 1000 periods Note that the measurement of cyclic signals starts and stops with the ve edge of the signal as shown in Figure 8 17 CSB 3595 Installation Guide Issue RP IMP 35952A Connector Block 35953C 8 15 6 6 2 6 6 3 8 16 ve edge ve edge Fig 8 17 Measurement of 10 periods Pulse Width For a one shot single pulse signal it is possible to measure either a positive pulse start with ve transition and end on ve as illustrated in Figure 8 18 or a negative pulse start with ve transitio
103. brey GmbH Deutschland tel Solartron Mobrey Ltd China tel Mobrey sp zo 0 Polska tel Solartron Mobrey AB Sverige tel Mobrey SA France tel Mobrey SA NV Belgium tel Solartron Mobrey USA tel 0211 99 808 0 021 6353 5652 022 871 7865 08 725 01 00 01 34 30 28 30 02 465 3879 281 398 7890 The right is reserved to amend details given in this publication without notice
104. c sheath over the wires CR 5 Seal the join with a heat shrink sleeve The sheathed wires may now be passed through the WE Note that the diameter of the sheathed wires should be at least 6 5mm for gland sealing Figure 4 4 Preparing a large diameter S Net cable 4 6 IMP Connections CSB 3595 Installation Guide Issue RM 3 S NET CABLING S Net allows up to 50 IMPs the actual number depending on the host interface to be connected into a distributed measurement system and using low loss cable the total cable length involved can be up to 1 5k meters S Net conveys all control signals from the host to the IMPs and all measurement data and status signals from the IMPs back to the host A dc supply can be conveyed from the host to the IMPs by maintaining a dc level for example 48V across the twin wires of S Net 3 1 S NET CONNECTIONS The S Net terminals local power terminals and the IMP address switches S1 and S2 are located on the connector block as shown in Figure 4 5 To connect the S Net cable remove the connector block cover to gain access to the terminals and make the appropriate connections When using the Belden 8641 cable supplied by Solartron connect the black lead to the white lead to and the braid to S COMMS n D D N l ni gn E S NET IN Ie o 5 EXT DO e 4 so p I I I I I I I e i FONDO 654 IMP I I I I I I I L Address COMMS 3 0
105. cable The graphs in Section 2 in this chapter are provided as an aid to cable selection Table 2 1 lists the cables supported by Solartron Instruments as being particularly suitable for linking IMPs to a host computer logger The cables are intended for general purpose use Note that the 18 AWG cable is a low loss type and an acceptable signal level is maintained with up to 1 5km of this cable Table 2 1 Cables Recommended for S Net Cable Gauge Cable Type and Manufacture Solartron Single Conductor Part No 12 AWG Brand Rex T12459 480120940 16 AWG Alpha 9820 Belden 9860 Brand Rex T12460 480120910 18 AWG Belden 9250 Brand Rex CD8920251 480121040 20 AWG Alpha 9818 Belden 9207 Belden 9815 direct burial 480120920 Brand Rex BC 57207 24 AWG Alpha 2400 Belden 8641 Brand Rex BI56641 480120700 JWS 3595 Installation Guide Issue RM S Net Cable and IMP Power 2 3 Approximately 10 metres of 24 A W G Belden 8641 cable are provided with each Solartron interface card logger This is sufficient for small data acquisition systems or for testing purposes All the recommended cables are U L approved Alpha and Belden cables are widely available from cable stockists Equivalent cables are available in lengths of 100 metres from Solartron Instruments see Solartron part numbers in Table 2 1 above CAUTION All IMP and VIMP units must be connected to ground using the marked case stud before control or signal lea
106. cally with the connector end pointing downwards Any excess moisture will then tend to drain away from the vulnerable areas where cables enter the IMP In particularly hostile environments it is recommended that each IMP is mounted inside a sealed protective box and that the S Net cable is enclosed in a sealed protective duct See Appendix B in this manual for the IMP environmental specification Provision is made for securing the IMPs to permanent features on site such as stanchions and bulkheads The general approach is to use four bolts The bolting depends on the IMP type See Figures 3 1 through 3 3 Before any control or signal leads are connected the external case of the IMP must be grounded through the M4 studs provided Where ac power supply units are used the protective ground terminal E must be connected to the ac installation ground The ground connection must have a rating of 25A TOP VIEW 9mm SECTION A MOUNTING HOLE Overall IMP dimensions Grounding stud 485mm x 215mm x 34 5mm detail Note that there is a grounding stud on both sides of the IMP case Figure 3 1 Location of bolt holes on IMPs type 1A through 1E 2A and 2B 3 4 Siting and Securing an IMP JWS 3595 Installation Guide Issue RM VIMPs are always used singly and are secured by bolting through the two brackets shown in Figure 3 2 TOP VIEW Figure 3 2 Location and dimensions of VIMP bolt brackets JWS
107. ctronic circuitry This enclosure has mounting holes for securing the IMP in close proximity to the signal source b A detachable connector block to which all IMP connections are made via screw terminals Each connector block is retained in its IMP enclosure by two knurled screws Once a block has been withdrawn its screw terminals can be accessed by removing the cover The cover is secured by two cheese head screws Various IMPs and connector blocks are available It is essential that the correct block is used with the appropriate IMP The connector blocks and IMPs should be paired as shown in Table 4 1 Table 4 1 IMP and Connector Block Functions Connector IMP Block Measurement Function 35951A 35953A Voltage current temperature thermocouple 35951C 35953A Voltage current temperature thermocouple 35951B 35953B Voltage resistance strain gages temperature PRT or RTD or PT100 35951D 35953E Analog Output 35951E 35953A Voltage current temperature thermocouple 35951H 35953J Universal IMP Channel to channel isolation 200V 35951J 35953J Universal IMP Channel to channel isolation 500V 35952A 35953C Digital input output 35952B 35953F Switch input output 359593D 35953H RS232 to S Net Interface Vibration IMPs 35951F 35953G Vibration signal measurement 16 inputs 35951G 35953G Vibration signal measurement 32 inputs Details of the 39593J connector block used by the Universal IMPs type 1
108. d be inserted in a fluid to the distance recommended by the manufacturer Surface probes should be mounted with a small amount of heat sink compound between the probe and the surface See Figure A 12 Red dE istance Heat sink N compound 4 Figure A 12 Installing a PRT a insertion type b surface mounted type The three wire method of connecting a PRT is sometimes preferred to the four wire method due to the saving in sensor cable cost However the three wire method gives a less accurate result than the 4 wire method and has less thermal stability An example of the three wire connection is shown in Figure A 13 For the lead resistances to be effectively nulled conductors a and b should be identical gt PRT Figure A 13 PRT connections three wire method JWS 3595 Installation Guide Issue RA Measurement Techniques A 13 The comparison between the four wire and three wire connections is exactly the same for PRTs as it is for resistance measurements For the principle of three wire resistance measurement see Section 3 3 in this chapter The IMP type 35951B provides for the linearization of a PRT output to conform with the IEC 751 Standard PRT temperature readings are available over two ranges 200 C to 490 C and 490 C to 600 C with the sensitivity and limits of error specified in Appendix B of the manual 3 5 2 Using a Thermocouple
109. d for the software watchdog can be set with the SW command to an integer number of seconds from 1 through 255 The output for both watchdogs is Channel 20 Enabling either watchdog or both overrides any mode previously selected for this channel Normally the watchdog output is in the logic 0 no alarm state but should a watchdog alarm occur the output is switched to the 1 alarm state With a watchdog enabled power down forces Channel 20 to the alarm state LED DISPLAY Four LEDs on the end face of the IMP convey the following user confidence information when illuminated Power Power is applied to the IMP Cal Error The IMP has a calibration error contact a Solartron Service agent to get it recalibrated ADC Error The IMP has an ADC error contact a Solartron Service agent to get it checked out Scan The IMP is actively scanning predefined input channels For normal operation the state of the LEDs should be On Off Off On when scanning 12 22 3595 1H and 1J IMPs JWS 3595 Installation Guide Issue RM 6 SELECTING THE POWER SUPPLY SOURCE The 1H and 1J IMPs can be powered either from the Host via S Net or from a local power supply unit Two internal jumpers LK701 and LK702 must be inserted for power from S Net or removed for local power Normally an IMP is supplied with the jumpers inserted CAUTION The Host the local power supply or the IMP may be damaged if the IMP r
110. de for it Sections 4 1 through 4 6 relate only to Channels 1 through 18 whilst Sections 4 7 and 4 8 relate only to Channels 19 and 20 4 1 VOLTAGE MEASUREMENT CHANS 1 18 Connect the unknown voltage to the H L and G terminals as shown in Figure 12 2 On the even numbered channels the I and I notation should be disregarded For rejection of electrical interference the G terminal must be connected as shown For optimum performance connect the guard as shown for channel CH 1 If this is impractical connect the G and H terminals together at the terminal block as shown for CH2 e voltage to be measured CH 1 CH2 Figure 12 2 Example of voltage connections The voltage ranges available are the fixed ranges 20mV 200mV 2V and 12V and autorange JWS 3595 Installation Guide Issue RM 3595 1H and 1J IMPs 12 7 4 2 CURRENT MEASUREMENT CHANS 1 18 The IMP derives the value of current i by measuring the voltage v developed across a fixed precision resistor r then calculating the ratio v r Note that resistor r is fitted by the user and must be fitted only for current measurements The ranges available are 200UA 2mA 20mA 100mA and autorange Scaling within the IMP assumes that the value of resistor r is 1000 Other values of resistance can be used but the results must be re scaled accordingly For example if a 1000 resistor is used results received by the host must be divided by 10 The current
111. describes the connections the function and the installation background for each type of measurement input output 4 1 ANALOG INPUT CHANNELS The analog input channels provide for the acquisition of a variety of dynamic signals These signals may be acquired from transducers such as accelerometers velometers or displacement probes but the connections are the same in each case and S screen The terminal sets for the analog input channels are labelled CH1 through CH16 For the 32 channel VIMP channels 17 through 32 are connected to terminal sets CH1 through CH16 on the second connector block For each channel jumpers i e plug in wire links are used to configure the input range and coupling Jumper configuration is described in Section 5 of this chapter 4 1 1 Selecting the Optimum Input Voltage Range To select the optimum input voltage range the following criteria should be met 1 To avoid an overload condition the input range setting jumpers must be set to accommodate the largest signal expected from the transducer 2 To achieve the highest resolution it is important to select the lowest input voltage range that satisfies criterion 1 As far as the input ranges are concerned it is the peak value of the signal that is important for setting the range not the rms or peak to peak This is because the input ranges available are with respect to the peak value of the signal In practice to s
112. dg 0 16 fs 12V 12 000 8mV 0 05 rdg 0 16 fs DC Current Sensitivity assuming 1000 shunt ssssssssssseeee enne 10nA Error as for DC Voltage error of shunt resistor eakage currents CA Specifications for IMPs type 1A B C D E F G amp 2A B JWS 3595 Installation Guide Issue RF Thermocouples The following temperature ranges are based on 20ms 16 67ms Integration times All values are specified in degrees Celsius Error quoted is conformity to IEC584 BS4937 IMC 359551A C amp E must be in draught free enclosure no forced cooling Type Mid Range Error Full Range Error B Pt 30 Rh Pt 6 Rh 400 to1820 lt 0 3 80 to 1820 lt 2 0 E Ni Cr Cu Ni 100 to 250 lt 0 3 210 to 1000 lt 0 5 J Fe Cu Ni 100 to 350 lt 0 3 210 to 1200 lt 0 7 K Ni Cr Ni Al 100 to 450 lt 0 3 200 to 1370 lt 1 0 N Nicrosil Nisil 180 to 1280 lt 0 3 250 to 1300 lt 0 8 T Cu Cu Ni 100 to 400 lt 0 3 200 to 400 lt 0 5 R Pt 13 Rh Pt 0 to 1600 lt 1 0 50 to 1760 lt 2 0 S Pt 10 Rh Pt 0 to 1760 lt 1 0 50 to 1760 lt 1 5 Sensitivity Types BEJ KNT 5 Seege aa 0 1 C Sensitivity Types H 0 2 C Total thermocouple error equals Conformity plus voltage errors Additional error when using automatic Cold Junction Compensation Range 21551060 C ia 0 4 C 20 to TO Ceos eiei tr as lt 0 6 C External Cold Junction range 30 C to 80 C Open circuit detection threshold esses
113. ds iii 4 4 Figure 4 8 Cable gland details of 359563 Series Connectors sss 4 5 Figure 4 4 Preparing a large diameter S Net cable iii 4 6 CSB 3595 Installation Guide Issue RM IMP Connections 4 1 Figure 4 5 S Net terminals power terminals and IMP address switcheS iii 4 7 Figure 4 6 S Net connections for the 2B essen eene enne 4 8 Figure 4 7 Multi dropped connections of IMPs from the S Net cable sssssssssssss 4 8 Figure 4 8 S Net terminations EE 4 9 Figure 4 9 Terminating the S Net at an IMP sse 4 10 Figure 4 10 In line connections for occasional IMPS sss 4 10 Figure 4 11 External power connections for IMC 3595 52B cccceccscccccccescceeeeesesneeeesseeeenseenaes 4 11 Figure 4 12 Connections to the 3595 95A power unit sse 4 12 Figure 4 13 Connections to the 3595 95B power unit sse 4 13 Figure 4 14 Foot securing detail for the 359595D Power Supply Unit 4 14 Figure 4 15 IMP address switches set to 16 i 4 15 List of Tables Table 4 1 IMP and Connector Block Functions sseesseeseeeeeeeeeeeereeesnreenissrrrssissrnrsrnnsennsesens 4 3 4 2 IMP Connections CSB 3595 Installation Guide lssue RM 1 IMP CONNECTOR BLOCKS For installation purposes an IMP can be considered as comprising two parts a The main cast aluminium enclosure containing the ele
114. ds are connected Where mains power supply units are used the protective earth E terminal must be connected to the mains installation earth The ground connection must have a current rating of 25A 2 CABLE SELECTION Figures 2 1 and 2 2 indicate the minimum wire gauge for S Net supply voltages of 24V and 48V Each figure shows the No of IMPs plotted against cable length km for four different gauges of cable The area enclosed by each curve and the X and Y axes represents the various combinations of IMPs versus distance that can be accommodated by the particular cable gauge The gauges are identified in the table that accompanies each figure Example The S Net supply is 24V and 10 IMPs are to be powered via the cable The total cable length is approximately 300 metres For a 24V supply refer to Figure 2 1 and note that lines drawn from the 10 IMPs and 0 3 km points intersect in the area covered by the 16AWG cable The point of intersection also lies within the area covered by the 12 AWG cable Therefore although 16 AWG is the thinnest cable that can be used the 16AWG cable and the thicker 12 AWG cable are both suitable Having determined a suitable cable gauge select one of the preferred cable types Cables other than those preferred may be used but in order to ensure error free communications these cables must conform to the following specification e Characteristic impedance in the range 80 ohms to 120 ohms e Attenua
115. dy state current sink capability of 100mA Over voltage protection of the FET is provided by a 62V zener diode A typical arrangement of digital outputs with load energisation by the an external supply is shown in Figure 9 9 5V OUT Note the total load across the 5V out terminals should not be less than 250Q load relay coils contacts etc e od to other channel O Ps to COM of other channels configured as outputs Fig 9 9 Digital Output JWS 3595 Installation Guide Issue RQ IMP 3595 2B Connector Block 35953F 9 7 9 8 LED DISPLAY The four LEDs visible at the end face of the IMP convey certain user confidence information when illuminated They are allocated as shown in Table 9 1 Table 9 1 Meaning of the LED Display LED Meaning Comment 1 Power on O K 2 Not allocated 3 Event buffer full Lost events being counted 4 IMP scanning active O K IMP 3595 2B Connector Block 3595 3F JWS 3595 Installation Guide Issue RQ VIMPs 3595 1F G Connector Block 3595 3G Contents 1 VOTE e E EE 10 3 1 1 VIMP Power Supplies sse nennen nenne neret 10 3 2 Internal Organization enne nennen nnn nennen nnns 10 4 3 Measurement Connections eene enne nein nennen tenen 10 5 4 Measurement Preparation eene nnn nnns nnns 10 7 4 1 Analog Input ChannelSs i
116. e measurement and reference junctions When temperatures lower than 0 C are being measured the hot Junction is cooler than the cold junction Thermocouples may be connected to an IMP connector block in two different ways One of these Figure A 15 uses an external reference unit whilst the other Figure A 16 uses the IMP input connections themselves as reference junctions In the latter case the ambient temperature of the input terminals is monitored in the connector block A 14 Measurement Techniques JWS 3595 Installation Guide Issue RA and temperature compensation is applied automatically In these practical measuring circuits there are of course two reference junctions one at the Hi input terminal and one at the Lo but since these two closely located terminals have a common temperature they act as a single junction Note the use of compensating extension cables to connect the thermocouple sensor to the reference junctions These cables contain single or multiple pairs of wires whose composition is the same as or similar to that of the sensor metals and this allows the measurement and reference junctions to be situated a suitable distance from each other Use only those cables recommended by the thermocouple manufacturer and make sure that they are connected the right way round Most cables are color coded to allow you to identify the positive and negative wires but be careful the color codes vary from
117. e LED Display LED Meaning Comment 1 Power on O K 2 Calibration error Recalibrate IMP 3 Not allocated 4 Changing output Executing an analog output command UWS 3595 Installation Guide Issue RA IMP 3595 1D Connector Block 3595 3E 7 9 7 10 IMP 3595 1D Connector Block 3595 3E JWS 3595 Installation Guide Issue RA IMP 3595 2A Connector Block 3595 3C also covers IMC 3595 52A and Connector Block 3595 53C Contents 1 Input Output Channels e 8 3 2 Internal Organisation oo er e cr PO alal acilia 8 4 3 Logic Level Convention tercer eee ette pe Pen reed 8 5 4 Logic Threshold Levels Input Channels cece eeeeeeeeeeeeeeeeteaeeeaeeeeeeeneeaaes 8 6 5 Sampling Rate oou tbe iens 8 6 bu 20Hz kHz Sampling eoe Erb ater ein Lara 8 6 5 2 10kHz 100kHz Sampling sss eene tnmen tenen nennen 8 7 6 Measurement Preparation i 8 8 SECCIONES 8 8 6 2 Event Capt te 5 coercere Ec aan ea 8 10 6 3 Count EVents ee oeste eec i dt ee de iea ia des 8 11 6 4 Frequency and Period Introduction i 8 13 0 5 Erequel6y madi o e v e eL EIS 8 13 6 6 tee oe pote eade oue das koe dex te urere uer Sat 8 14 6 7 DBigital OUIDUE ien et cag rn e EH TO opp en RR pn 8 17 7 LED Dis olay c ail ARA aaa 8 18 List of Figures Fig 8 1 Input output channel circuit iii 8 3 CSB 3595 Installati
118. e fas aes oce a ee eei sa e ade daga kd apr m deu eh dene Rb dee 6 6 9 4 Stra eon tute coe pede obe e Blei eu E iii 6 7 4 LED Display a ror en ted ren bb e E P t lia 6 16 List of Figures Fig 6 1 Schematic of an input channel iii 6 3 Fig 6 2 Schematic of the IMP operation essem emen 6 4 Fig 6 3 Voltage measurement connections i 6 5 Fig 6 4 Resistance measurement connections four wire cesse 6 5 Fig 6 5 Resistance measurement connections three wire esee 6 6 Fig 6 6 Temperature measurement connections four wire sess 6 6 Fig 6 7 Temperature measurement connections three wire esee 6 7 Fig 6 8 Effect of IMP sensor warming period on measurement timing eessseseeeeseeeeseeeeeee 6 8 Fig 6 9 Schematic of the full bridge measurement circuit esee 6 9 Fig 6 10 The full bridge measurement connections sesseseeeeeeeeeeeererrrerreerrrrerrerrrrrerren 6 10 CSB 3595 Installation Guide Issue QF IMPs 3595 1B Connector Blocks 3595 3B 6 1 Fig 6 11 Schematic of the half bridge measurement circuit sese 6 11 Fig 6 12 Half bridge measurement connections five wire sss 6 12 Fig 6 13 Three wire connection of strain gauges sessssseeeee eene 6 13 Fig 6 14 Quarter bridge shared dummy measurement circuit sssssssnssnnnnnnennnnnnnenen nenen ennenen 6 14 F
119. eceives power from S Net and the local supply simultaneously with the jumpers inserted Removing the jumpers disconnects S Net from the internal dc supply lines of the IMP The jumpers are on the main PCB of the 1H and 1J IMPs see Figure 12 19 and this PCB can easily be removed for jumper adjustment PCB removal is explained in Section 1 1 in the present chapter NOTE Power source adjustment by the user is recommended only for 1H and 1J IMPs These are the IMPs contained in the standard Universal IMP case Other types of IMP including the 553H and 553J IMPs must be returned to a Solartron Service Centre for adjustment The case of any IMP other than the 1H and 1J is composed of two half shells sealed with a cork gasket and held together by socket headed screws The standard case for a Universal IMP is the one described in Section 1 1 1 in this chapter This is the location of the power source select jumpers LK701 and LK702 These jumpers must be inserted for power to be obtained from S Net but removed if the IMP is to be powered locally Local power is connected to the IMP through the Ext Power terminals on the 35953J Connector Block Figure 12 19 Location of the power source selection jumpers Guidance in the selection of S Net cables for IMPs powered from S Net is given in Chapter 2 This chapter also lists the IMP power supplies available both for supplies through S Net and those local to the IMP
120. ected by the top half shell place the VIMP on the work surface with the input card for channels 17 through 32 uppermost Ensure that a serviceable neoprene bonded cork gasket is correctly positioned around the edge of the half shell attached to the VIMP assembly The gasket must be located over the bosses with raised shoulders so that its outer edges coincide with the closed sides of the half shell and the cross piece at the open side is aligned with the rubber seal around the input card Spare neoprene gaskets can be obtained from Solartron under Part No 35952214 Place the desiccant bag on the pcb Depending on the length of time that has elapsed since the VIMP was last opened and the number of significant pressure changes it may be necessary to fit a new desiccant bag Part Number 450600420 If a new desiccant bag is not immediately available it is possible to reactivate the contents as follows open the bag and empty the clay granules onto a suitable tray then place the tray in a low temperature 140 C oven for between 7 and 8 hours finally allow the tray and clay granules to cool in a dry environment before returning the clay granules to the bag and closing it Note however that the ability of the clay granules to absorb moisture is degraded each time they are reactivated therefore this method should be employed only in an emergency and no more than twice with the same granules 10 16 VIMPs 3595 1F G Connector Bl
121. ed via the S Net cable this power must be supplied by the host computer logger either directly from its own circuits or indirectly from a supplementary power supply Alternatively an IMP can be powered locally from a 12V 24V or 48V d c supply When powering IMPs via the S Net cable it is essential that the cable core is of an adequate gauge The actual gauge required depends on the number of IMPs to be powered their distribution along the cable and the power supply voltage It is safest to assume the worst case distribution of the IMPs this is where all IMPs are grouped at the end of the cable furthest from the host IMPs that are to be powered locally do not affect the S Net gauge requirement However with a mix of locally powered and S Net powered devices the gauge requirement must always be considered NOTE When deciding on a particular gauge of cable bear in mind any future sys tem expansion Installing a cable that is able to cope with your projected require ments will save you the bother and expense of changing the cable at a later date Each IMP consumes approximately 1W 1 2W at power up 35951D Analog Output IMPs can in some applications require more In these circumstances they need special consideration refer to Chapter 7 Section 5 for details Generally the thickest cable used is 12 AWG 3 4mm and the thinnest should not be less than 24 AWG 0 2mn Always err on the side of thicker rather than thinner
122. elect the optimum range it is necessary to know the maximum peak level of the signal expected under normal operating conditions In this case normal operating conditions means the range of machine operation under which you would expect to make measurements To measure this peak value the VIMP can be used and the following procedure is suggested 1 Setup the VIMP input ranges to the maximum range i e their factory default setting of 10V 2 Log the peak signal at the highest acquisition rate available 3 Continue logging until an adequate representation of the normal operating conditions has been recorded 4 Search through the data to identify the peak signal and then select the VIMP input ranges according to criteria 1 and 2 above If you can t measure the input signal over the complete operating range of the machine then you should estimate the peak value that is likely to occur JWS 3695 Installation Guide Issue RN VIMPs 3595 1F G Connector Block 3595 3G 10 7 To get a rough idea of the signal levels present measure the peak value using a low cost handheld peak meter Then estimate how much larger this value could get over the complete machine operating range This saves the time involved in a logging data over a period of time with the VIMP and b breaking down the casework on two occasions rather than one initially to set up coupling and finally to set up the input range This proceedure holds true for sig
123. eparately as follows 1 Fit the measurement card from the front of the mounting frame by sliding the metal plate into the guides in the card support assemblies until the front panel of the card is flush with the edge of the frame 2 Secure the measurement card using the captive screws located within the card ejectors 3 Make the desired connections to the connector card 3 14 Siting and Securing an IMP JWS 3595 Installation Guide Issue RM 4 Fit the connector card from the rear of the mounting frame sliding the metal plate into the guides in the card support Take care to ensure that the connectors mate easily with the corresponding connectors on the measurement card 5 Secure the connector card using the four captive screws in the panel 4 2 1 Fitting the 359552B IMC The 2B IMC has no connector blocks so the card is fitted into the rack as follows 1 Fit the measurement card from the front of the mounting frame by sliding the metal plate into the guides in the card support assemblies until the front panel of the card is flush with the edge of the frame 2 Locate the two support plates to the rear of the frame so that the locating pins on the plates line up with the holes on the rear of the IMC 3 Secure the support plates to the frame 4 Push the card into place until the locating pins pop into the card then secure the measurement card using the captive screws located within the card 5 Make the desired connec
124. er Supply Cable Cable of adequate gauge should be used to connect the 359595D Power Supply to the 35951F or 35951G VIMP The gauge should be such that less than 200mV is dropped across the line carrying the 5V supply Assuming that an identical gauge is used for the other lines i e those carrying the 5V 12V and 12V supplies then no problems should be encountered To enable the installer to make the correct connections the supply terminals on the 35953G Connector Block and the corresponding terminals on the 359595D Power Supply are clearly labelled 2 10 S Net Cable and IMP Power JWS 3595 Installation Guide Issue RM Siting and Securing an IMP Contents 1 IMP Siting Options ia Zona ee cs e dico era dap e de vl een ees 3 3 2 Siting And Securing Individual IMPS eese e ee neeesrrssirrsssrnnsrnnsrnssrnssrssrnssrne 3 4 3 Rack Mounted IMPG i 3 8 3 1 IMPiGroundingi sinrhi eege Eed eg ii 3 11 4 Rack Mounted IMCS cece eee eee aaeeeeeeeeeeeaaeeseaeeeegeneeseeeesaeeesaesnaeseeeeseeeeees 3 12 4 1 Assembling a 359591B Rack Mounting Kit 3 12 42 Glenn Elle 3 14 4 3 Removing IMCS enne nnntr nenne a nennen en 3 15 4 4 Selecting the IMC Power Supply Source 3 16 4 5 EnvirOnrfient eie se fetu ee d d e He d EEN 3 16 5 Rack Mounted Universal IMPS eene nnns 3 17 5 1 Assembling a 359591G Rack Mounting Kit 3 17 5 2 Fitting the Rack Mo
125. er support tray at the rear using the M3x5mm screws and crinkle washers provided The strip must be oriented with the fixing holes at the top Screw the two fascia strips to the front of the rack mounting frame using the M3x5mm screws and crinkle washers provided The top fascia should have the screw holes at the bottom and the bottom fascia should have the screw holes at the top Screw a rack ear to each side of the rack at the front using the M4x8mm screws and crinkle washers provided The rack is now ready to be installed in a 19 inch cabinet and should look like the example shown in Figure 3 14 Figure 3 14 An assembled 359591G rack viewed from the rear FITTING THE RACK MOUNTING FRAME INTO THE RACK The rigid construction of the 359591G rack mounting frame and the comparative lightness of the universal IMPs allows the frame to be secured and supported in the rack by the rack ears alone To install the mounting frame 1 Hold the frame against the front of the rack in the required position with the holes in the rack ears aligned with the fixing points on the rack Secure the frame to the rack by bolting through the rack ears into the fixing points Start by inserting a fixing screw in the bottom of each ear to hold the frame in place Then insert the remaining screws and tighten all screws to secure and support the frame 3 18 Siting and Securing an IMP JWS 3595 Installation Guide Issue RM 3
126. f a time out period passes without the watchdog being patted receiving a reassurance signal the output is reset into its power off state Note that enabling the watchdog overrides any previous channel configuration on channel 32 IMP 3595 2B Connector Block 3595 3F JWS 3595 Installation Guide Issue RQ 6 4 6 5 EVENT CAPTURE The purpose of event capture is to determine when a logic transition occurs noting the date time and the polarity of the transition A special buffer used by all event capture channels stores the event information The buffer can store up to 128 events and once full keeps a count of how many events are then discarded up to 64k The transitions recorded can be ve ve or both ve transition a signal which passes from logic 0 to logic 1 ve transition a signal which passes from logic 1 to logic 0 DIGITAL OUTPUT Channels 29 32 can be configured as a digital output to drive such devices as indicators and reed relays In this configuration the output consists of an open drain MOSFET which can be regarded simply as a resistance switch For switch closed the resistance between O and C 10Q For switch open the resistance between O and C 10OMQ IMP O P O P 10M COM COM I I E I stelo tari output set to switch closed output set to switch open Fig 9 8 Equivalent circuits of the digital outputs The rating of the FET is 80V 1W with a stea
127. for instance in the presence of high humidity see the general IMP and IMC specifications at the end of Appendix B or rapid airflow across the cards WARNING Care must be taken when working with IMCs High voltages may be present on any part of the printed circuit cards you are not protected by the casing and you may receive and electric shock if you touch one of the inputs NOTE All references to IMPs in this Installation Guide are also applicable to the corresponding IMCs unless otherwise stated The mounting of IMPs and IMCs is described in Chapter 3 of this manual VIMP Mounting VIMPs are always mounted singly through brackets attached to them IMP CONNECTIONS All connections to an IMP are made via a detachable connector block This allows the IMP to be easily removed from the system and replaced by another should the need for service arise Chapter 4 of the manual contains the general instructions for making connections These cover the sealing of all cable entries to the IMP and details of the S Net connections Also mentioned towards the end of Chapter 4 are the IMP address switches Introduction JWS 3595 Installation Guide Issue RM Details of the sensor connections are given in Chapters 5 through 10 and 12 which cover specific types of IMP Practical advice on which type of sensor to use for a particular application is given in Appendix A of the manual 2 4 EMC All IMPs meet the requirement of EN500
128. ganization Measurement Connections Measurement Preparation Jumper Configuration LED Display Local Setup Panel IMP 3595 93D and Connector Block 3595 3H The Communications Gateway Serial IMP Connections IMP 3595 1H amp J and Connector Block 3595 3J The 1H and 1J Universal IMPs Channel Functions The 35953J Connector Block Measurement Preparation LED Display CSB 3595 Installation Guide Issue RF Appendix A_ Measurement Techniques Appendix B Appendix C CSB 3595 Installation Guide Issue RF DAWN 1 2 3 DO NDOUIDSWIN Introduction Input Data Measurement Concepts Combating Interference Effect of Parallel Instrumentation Specifications for IMPs type 3595 1H and 1J Analog Measurements Digital Inputs General Specifications Specifications for IMPs type 3595 1A 1B 1C 1D 1E 1F 1G 2A and 2B 35951A 1C and 1E Analog Measurement IMP Specification 35951B Analog Measurement IMP Specification 35952A Digital Input Output IMP Specification 35952B Switch Input Output IMP Specification 35951D Analog Output IMP Specification General IMP and IMC Specifications 35951F and G Vibration IMP Specification Power Supply Specifications Contents iii iv Contents CSB 3595 Installation Guide Issue RF elieelelfieidele Contents 1 The IMP System morcs enna aie nia iaia a c qe RE te x e c dd do 1 3 2 Approach To installation i 1 5 2 1 S Net Cables And IMP Power Requirements 1 5 2 2
129. gic 0 or indeterminate Current logic 0 Fig 9 2 Positive logic convention 4 LOGIC THRESHOLD LEVELS INPUT CHANNELS All inputs are compared with pre set voltage threshold levels in order to ascertain the logic states of those inputs logic 1 logic 1 500kQ 9 0V Indeterminate Indeterminate 3 0V logic O logic O 80kQ a input thresholds for volt free contact b input thresholds for voltage input Fig 9 3 Input channel thresholds Note that levels situated between the selected thresholds are considered to be indeterminate This means that it is impossible to predict whether such a level will be interpreted as a logic 0 or a logic 1 5 SAMPLING RATE The inputs are sampled every 20ms A logic level is recognised if four successive samples are stable 9 4 IMP 3595 2B Connector Block 3595 3F JWS 3595 Installation Guide Issue RQ 6 MEASUREMENT PREPARATION Normally only two wires are connected to any group of IN OUT and COMMON terminals I P input from i to ransducer transducer COM a as input 1 32 b as output 29 32 Fig 9 4 Connection terminals Note that the connection terminals of a channel should be used either for an input transducer or for an output transducer not both If this rule is not observed signals received from the input transducer may be coupled back to the output and produce an unexpected change on a connected ouput transducer Norm
130. gure 6 7 For the lead resistances to be effectively nulled the conductors should be identical PRT platinum resistance thermometer Fig 6 7 Temperature measurement connections three wire 3 4 STRAIN For the measurement of strain full half quarter bridge and 3 wire configurations of resistive strain gauges can be accommodated It is intended that the bridges be energized by the dual current supply built into the IMP Measured results are converted to microstrain by the IMP microprocessor before being transferred to the host Strain gauges can also be energized in the traditional way by an external voltage In this case the user must provide the voltage and also process the results to convert them into microstrain It should be noted that the dual current method offers several advantages over the voltage method the most important being that it eliminates the effect of lead resistance variations with temperature This applies particularly to half and quarter bridge configurations For the IMP to convert results to microstrain it must know the gauge factors for the active gauges in each bridge This information must be input to the host which then passes it on to the appropriate IMP In all bridge applications efforts should be made to construct bridges with gauges from the same production batch so that all have identical gauge factors and temperature coefficients The gauge factor then becomes G usually between 2 and 2 2 mul
131. hannels 1 through T 12 13 Figure 12 8 Example of status input connections Channels 1 through 18 ss 12 13 Figure 12 9 Contact Closure 20Hz 1kHz sampling essen 12 14 Figure 12 10 Solid State Switching 10kHz 100kHz sampling sss 12 15 Figure 12 11 Logic level interpretation on Channels 19 and 20 iii 12 15 Figure 12 12 Example of status input connections Channels 19 and 20 sss 12 16 Figure 12 13 Effect of mark space ratio on event count rate iii 12 18 Figure 12 14 Effect of mark space ratio on measurable input frequency i 12 18 Figure 12 15 Effect of mark space ration on minimum measurable period 12 19 Figure 12 16 Measurement of 10 periods starting and stopping on ve edge 12 20 Figure 12 17 Measurement of a Positive pulse ii 12 20 Figure 12 18 Example of digital output connections sese 12 21 Figure 12 19 Location of the power source selection jumpers csecsen 12 23 List of Tables Table 12 1 Measurement Types for Channels 1 through 18 sse 12 5 Table 12 2 Measurement Types for Channels 19 and 20 sse 12 5 Table 12 83 Count Rate v Sample Hate 12 17 Table 12 4 Result Resolution v Measurement Rate sse 12 19 12 2 3595 1H and 1J IMPs JWS 3595 Installation Guide
132. hapter 12 Section 6 of this manual e The links on the IMCs are easily accessible and may be adjusted as described in Chapter 3 Section 4 4 of this manual For all IMPs and for all IMCs except the 3595 52B the EXT DC terminals are arranged as shown in Figure 4 5 External power for the IMC 3595 52B is routed through the same 9 way D Type connector as that used by S Net The external dc connections on this are shown in Figure 4 11 Ext ve Not Used Ext ve Not Used Not Used S Net Not Used ce ve Screen Figure 4 11 External power connections for IMC 3595 52B CAUTION The host a local power supply or an IMP may be damaged if the IMP receives local and remote power simultaneously This can happen if an external supply is connected to an IMP or IMC with the power supply links inserted CSB 3595 Installation Guide Issue RM IMP Connections 4 11 4 1 POWER SUPPLY UNITS AVAILABLE The power supply units available for IMPs are the 359595A and the 359595B The 359595A is designed to provide power for the IMPs from the host end of the network It can provide up to140 Watts of power at 48Vd c which is sufficient power for a worst case system with 50 IMPs on a single network The 359595A is a modular unit and must be fitted in an enclosure This is to prevent any possibility of contact with live parts through the ventilation holes and to protect the unit from adverse operating conditions such as damp and excessive dust Users must co
133. he composition of wire c is not critical Since this ideal is rarely achieved in practice the three wire method is less accurate than the four wire method and has less thermal stability JWS 3595 Installation Guide Issue RA Measurement Techniques A 5 3 4 STRAIN MEASUREMENT Strain measurement is the measurement of the change in shape of a material under stress The two simplest types of strain are tensile and compressive and it is these to which most strain gauges are designed to respond Strain is the ratio of two lengths the change in length 81 of a test piece and the original length 1 Therefore strain has no dimensions Since most strains measured by a strain gauge are relatively small strain is said to be measured in microstrains ue where one microstrain equals one micron dl per metre 1 Note a micron equals one millionth of a meter 3 4 1 Strain Gauges Strain gauges are transducers whose resistance varies under an applied stress There are two categories metallic and semiconductor Metallic gauges have a gauge factor G 6Q Q microstrain of approximately 2 Semiconductor gauges have a higher gauge factor of approximately 100 but also have a high temperature coefficient which tends to limit their application One type of metallic gauge commonly used consists of an etched metal foil pattern Figure A 5 on a suitable base for example polyester This is attached to the test piece by a suitable adhesive for exa
134. he two leads x and y in Figure A 9 is included in the bridge Therefore to balance the bridge these leads should be identical With regard to temperature compensation the leads should be routed alongside each other so that any variation in lead resistance cancels out With regard to bridge sensitivity the lead resistance should not be so high as to reduce the sensitivity unduly The comments in Section 3 4 4 3 regarding the use of a remote dummy apply equally to the three wire bridge A 10 Measurement Techniques JWS 3595 Istallation Guide Issue RA 3 4 5 3 4 6 3 4 7 Strain gauge orientation It is important that strain gauges are correctly orientated on the surface to be measured In the example shown in Figure A 10 gauges A and D are under tension while gauges B and C are in compression this bridge configuration allows the gauge factors to add up to a combined sensitivity of 4 G Force Gage 4 and Gage D Gage A ZZ Connec Gage B and Gage C evation tions shown in Fig A 6 Gage C T increase in R gage V decrease in Rage Figure A 10 Example of strain gauge orientation The two strain gauges in a half bridge are similarly oriented For example gauges C and D in Figure A 10 could be oriented the same way in a half bridge Note that dummy gauges bonded to the measured surface are mounted at right angles to the active gauge s that is to the line of stress Bridge Initialisation All strain measurements
135. iation from this ratio will lower the maximum count rate as shown in Figure 8 13 With 100kHz sampling the maximum count rate can be obtained with a mark space ratio of between 1 1 and 5 7 1 or vice versa Any increase in the mark space ratio lowers the maximum count rate as shown in Figure 8 13 The sharp steps in the 100kHz curves are due to software constraints MOO dq px 100kHz 80 I 20Hz 1kHz 10kHz sampling Event 60 i count rate _ of max SR LL 20 0 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 1 10 1 mark space ratio or vice versa Fig 8 13 Effect of mark space ratio on event count rate single channel Maximum Count Rate Using All Channels With 20Hz and 1kHz sampling the maximum count rate can be obtained only if the mark space ratio of the input signal is 1 1 Any deviation from this ratio will lower the maximum count rate as shown in Figure 8 14 With 10kHz and 100kHz sampling there is virtually no restriction on the input signal mark space ratio The sharp steps in the 10kHz and 100kHz curves are due to software constraints 100 ele ete ese I INS i0kHz TB i sampling 123 1 132 1 80 Event 60 20Hz 1kHz sampling E I count 2n 1 rate 40 100kHz 96 of max sampling 1 20 IVi 0 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 1 10 1 mark space ratio or vice versa Fig 8 14 Effect of mark space ratio on event count rate all channels used IMP 35952A Connector Block 35953
136. ig 6 15 Quarter bridge measurement connections with remote dummm 6 15 Fig 6 16 Quarter bridge measurement connections with local dummy suse 6 16 List of Tables Table 6 1 Meaning of the LED Display sseeessssseeseeerreessnrrnessnnrneessnnnnnensnnnnnannnnnnnnnennnnnennnnnnnnne 6 16 6 2 IMPs 3595 1B Connector Blocks 3595 3B CSB 3595 Installation Guide Issue QF 1 INPUT CONNECTIONS The IMP 35951B has ten switched solid state channels which can be individually configured to measure voltage resistance temperature PRT or strain CMOS switches H Hi EH I ey eps m G Guard Sense om D See I la Era constant to ADC current sources l O current return R i I i Multiplex gt J Control Fig 6 1 Schematic of an input channel Six switched connections are provided for each channel H Hi L Lo G Guard Sense I supply current A I supply current B and I return current Two other unswitched terminals Ip and S2 are provided for use in quarter bridge strain gauge measurement Whilst it is not essential to terminate unused channel inputs it is nevertheless good practice to link terminals H L and G Alternatively the IMP can be commanded to skip unused channels In an electrically noisy environment it is advisable to implement both the above precautions CSB 3595 Installation Guide Issue QF IMPs 3595 1B Connector Blocks 3595 3B 6 3 6 4 INTERNAL ORGANIZATI
137. igital Input Output IMP Specification eeeeeeeeeeeeeeteees C 9 4 35952B Switch Input Output IMP Specification C 11 9 35951D Analog Output IMP Specification i C 12 6 General IMP and IMC Specifications ssssse C 13 7 35951F G Vibration IMP Specification oonnennneeeeeenneeeeeeeesrnrrsserrrserrrrerrrn nee C 14 8 Power Supply Specifications esssssssssee em C 16 UWS 3595 Installation Guide Issue RF Specifications for IMPs type 1A B C D E F G amp 2A B C 1 C 2 Specifications for IMPs type 1A B C D E F G amp 2A B JWS 3595 Installation Guide Issue RF All limits of error are for 1 year at 20 C 3 C 1 35951A C amp E Analog Measurement IMP Specification Note This specification also covers 359551A C amp E Analog Measurement IMC but the performance figures quoted cannot be guaranteed when the IMC is installed in a non hermetically sealed enclosure in humid environments 35951A Number of channels A 20 den EE solid state three pole Maximum signal measured ENEE enne nnne nnne nnne nennen 12V Overload protection continuous enne 50V Maximum voltage between any input and any guard 14V Common mode between IM 500V M T B Fato MIE21ZE zaia tees 137 000hrs IMP 146 000hrs IMC Measurement Voltage Noo 0 to 12V Curren
138. igure 4 15 IMP address switches set to 16 An IMP reads its address at power up Hence if the address of an IMP is changed the new address will not be registered until the IMP is next powered up Note If an application program for the host computer has already been written references to IMPs at specific addresses may have been included In this case it is essential that each IMP is assigned the same address as that used in the application program CSB 3595 Installation Guide Issue RM IMP Connections 4 15 4 16 IMP Connections CSB 3595 Installation Guide Issue RM IMPs 3595 1A C E Connector Blocks 3595 3A D also covers IMCs 3595 51A C E and Connector Blocks 3595 53A D Contents 1 Input Connections cence eee eeeeeeeeeeeeae eene ennr nenne sensi trs sn nrns ennt enne enn nnn 5 3 2 Internal Organisation ie 5 4 3 Measurement Preparations i 5 5 Gul Voltage israeliani Dt I E LL 5 5 2 2 e EE 5 6 KC HM le EE 5 7 4 EED Bisplays iets recon il sel EE el uu 5 7 List of Figures Fig 5 1 Schematic of the channel input iii 5 3 Fig 5 2 Schematic of the IMP operation 5 4 Fig 5 3 Voltage measurement with the 35953A connector block sse 5 5 Fig 5 4 Voltage measurement with the 35953D connector block sse 5 5 Fig 5 5 Attenuated voltage measurement with the 35953D connector block 5 5
139. ii 10 7 Nee EE EE 10 8 CTIE Miete TE 10 8 4 4 Alar OVPU a eege bien tn ati ita ette Seege E 10 8 5 Jumper Configuration ii 10 10 5 1 Accessing the VIMP Jumpers nennen nnn nnne enne 10 10 5 2 Configuring the VIMP Jumpers Version 1 10 13 5 3 Configuring the VIMP Jumpers Version 2 i 10 14 5 4 Reassembling the VIMP i 10 15 6 LED Display ena ab nap eadem 10 18 7 Local Setup Panel i 10 19 7 1 Local Control Connection for RS232 10 19 7 2 Selectable Vibration and Sync Inputs 10 21 JWS 3595 Installation Guide Issue AN VIMPs 3595 1F G Connector Block 3595 3G 10 1 List of Figures Fig 10 1 Simplified block diagram of the 35951F G VIMP hardware sss 10 4 Fig 10 2 Layout of Connector Block 85953G isses enne ene 10 6 Fig 10 3 Location of jumpers on the VIMP input card 35959552 sess 10 13 Fig 10 4 The jumpers and jumper settings of the VIMP input card 85959552 10 14 Fig 10 5 Pin numbers of RS232 mating plug rear view sse 10 21 List of Tables Table 10 1 Analog Input Coupling Options sss nennen 10 13 Table 10 2 Analog Input Gain Options sss eene nennen nnne renes 10 13 Table 10 3 Synch Channel Coupling Options iii 10 14 Table 10 4 Collet Sizes for Series 103 Plugs ii 10 20
140. in Table 1 2 JWS 3595 Installation Guide Issue RM Introduction 1 3 Table 1 2 IMP Functions IMP Type IMP Functions 3595 1A Provides twenty channels of solid state switching for measuring voltage current and temperature 3595 1B Provides ten channels of solid state switching for measuring voltage resistance temperature and the outputs from strain gages 3595 1C Provides twenty channels of reed relay switching for measuring voltage current and temperature 3595 1D Provides four channels of isolated analog output 3595 1E Similar to the 35951C but allows a higher voltage between channels 3595 1H Provides an enhanced version of many of the facilities provided by the IA IB 1C IE 2A and 2B IMPs Twenty channels are provided eighteen of these can be used for an analog or digital status input and two channels can be used either for a digital status and event count input or for a control logic output Channel to channel isolation is 200V 3595 1J Same facilities as the 1H Channel to channel isolation is 500V 3595 2A Provides twenty channesl of transformered isolated switching in which each channel can be configured as an input or as an output 3595 2B Provies thirty two channels of transformer isolated switching in which channels 1 28 can be configured as an input and channels 29 32 can be configured as an input or output 35959 3D Provides an RS232 to S Net interface for input
141. into an electrical signal that an IMP can recognise The IMPs type 35951A C and E measure temperature with a thermo couple whilst IMP type 35951B does the same with a platinum resistance thermometer PRT To help you decide which type of sensor to use Table A 1 compares their overall performances Note that PRTs are also known as RTDs resistance thermometer devices Table A 1 Performance Comparison PRTs v Thermocouples Aspect Resistance Thermometer Thermocouple Range 200 C to 850 C 250 C to 2000 C Accuracy 0 1 C to 1 C 0 5 C to 5 C Stability Excellent output consistent with Tendency to drift type K in particular temperature over very long periods Response time 1 second to 50 seconds 0 05 seconds to 5 seconds Vibration tolerance Not as tolerant of vibration as Mineral insulated types are suitable for thermocouples generally but supported arduous operation types are available for industrial use Noise susceptability Less susceptible to electrical interference More susceptible to electrical interference than thermocouples than PRTs Size Resistance thermometers generally are Some very small thermocouples are larger than thermocouples available Cost A PRT normally costs between two and Thermocouples are cheaper see opposite three times as much as a thermocouple of column similar performance Leads required Ordinary copper leads To ensure accurate results the leads between
142. ion then the effective load can be increased by connecting a resistor in series with the load For example if the current output supply voltage is 24V and the load resistance is 250 then a 470 in series resistor increases the total load to 7200 which is greater than the minimum load of 4700 This example is illustrated in Figure 7 8 Figure 7 8 Example increasing the effective load with a series resistor 7 8 IMP 3595 1D Connector Block 3595 3E JWS 3595 Installation Guide Issue RA 5 POWER AND CABLING CONSIDERATIONS Normally the power consumption of the 35951D is less than 1 1W and so it can be considered as just another IMP with no special considerations However if any of the output channels are used for current output with the arrangement shown in Figure 7 5 then the IMP consumes up to 3 1W and the following points MUST be considered when deciding on the power supplies and system cabling 1 If local power is to be used then the power supply must be able to deliver 3W at between 10V and 50V 2 Ifthe IMP is to be powered via the S Net then the following two points should be noted a The IMP consumes the equivalent of three normal IMPs b There must be at least 30V across the network at the point where the IMP is fitted 6 LED DISPLAY The four LEDs visible at the end face of the IMP convey certain user confidence information when illuminated They are allocated as shown in Table 7 2 Table 7 2 Meaning of th
143. k The split pad numbers correspond to the channel numbers logic 1 logic 1 2 0V 9 0V Indeterminate Indeterminate 0 8V 3 0V logic 0 logic 0 a input thresholds with split pad shorted b input thresholds with split pad open circuit Fig 8 6 Input channel thresholds Note that voltage levels situated between the selected thresholds are considered to be indeterminate This means that it is impossible to predict whether such a voltage level will be interpreted as a logic 0 or a logic 1 5 SAMPLING RATE In common with all multi channel logging instruments IMPs do not monitor their input channels continuously but examine them at regular intervals The frequency of examination is known as the sampling rate Several sampling rates are provided for all the measurement functions that is 20Hz 1kHz 10kHz and 100kHz When setting up the system to be monitored study Sections 5 1 and 5 2 to determine the best sampling rate to use for your particular application Having selected a suitable sampling rate you should obtain repeatable results 5 1 20HZ 1KHZ SAMPLING Debounce is applied at these sampling rates giving protection against contacts bouncing on closure as may occur with industrial switches contactors reed relays etc With debounce applied four successive samples must detect the same logic level after a logic transition has occurred before that transition is recognised This ensures that no fal
144. k 3595 3G 10 19 Table 10 4 Collet Sizes for Series 103 Plugs Unsealed Plug Unsealed Plug Sealed Plug Type S Collet Type U Collet Cable Diam Diam to Cable Diam Diam to Cable Diam Diam to Range mm Specify mm Range mm Specify mm Range mm Specify mm 1 7 2 2 22 2 2 3 2 3 2 1 7 2 2 2 2 2 2 2 7 2 7 3 2 4 2 4 2 2 2 2 7 2 7 2 7 3 2 3 2 4 2 4 7 4 7 2 7 3 2 3 2 3 2 3 7 3 7 4 7 5 2 5 2 3 2 3 7 3 7 3 7 4 2 4 2 5 2 5 7 5 7 3 7 4 2 4 2 4 2 4 7 4 7 5 7 6 2 6 2 4 2 4 7 4 7 4 7 5 2 5 2 6 2 6 7 6 7 4 7 5 2 5 2 5 2 5 7 5 7 5 2 5 5 7 5 7 6 2 6 2 5 7 6 2 6 2 6 2 6 7 6 7 U or S the type of collet used for unsealed plugs for example style S or WS Type U is for use with unscreened unshielded cable or with screened shielded cable that is not connected to the plug body Type S is for use with screened cables that are connected to the plug body The type to use depends on whether the cable if screened is grounded at the other end grounding at both ends should be avoided as this may result in signal interference For sealed plugs e g style SE or WSE the collet type need not be specified unless ordered separately Part Numbers for individual plug components can be obtained from W W Fischer opt a three digit option number with which you can specify various options such as plug finish insulation and housing Details are
145. l analog IMPS gt 10GQ The 35951D can consume more in certain circumstances See Chapter 7 IMP Environment Storage temperature i 25 C to 75 C Operating temperature nennen 20 C to 70 C Humidity at 40 C non condensing ececeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeaeeesaaeenaeeseeeeees 95 Vibration operating for 2 NOUFSsi 5g 11Hz to 500Hz Otherwise to Def Std 66 31 Issue 01 Cat IV IMP Packaging Sealed aluminium casting to BS5490 IP55 IEC 529 and NEMA ICS6 Class 4 Dimensions i 435mmx215mmx34 5mm 17 1 x8 5 x1 4 Protrusion of cable boots emnes 50mm 2 Weight cer E 2 5kg 5 5lbs IMC Environment Storage temperature i 25 C to 75 C Operating temperature nennen nenne 10 C to 60 C Humidity at 40 C non condensing i 8596 Vibration operating for 2 bourg ssssssssssssersssssrrrsssrrirrssrirnssenssrenss 1g 11Hz to 500Hz Otherwise to Def Std 66 31 Issue 01 Cat II IMC Packaging Dimensions 420mmx218mmx30mm 16 54 x8 58 x1 18 Protrusion of El 30mm 1 18 UV Ee LEE 1 23kg 2 69lbs Safety e elle ET IEC 1010 1 EN61010 1 Electromagnetic Compatibility IMPs only complies with riasin A EN50081 2 and EN50082 2 Note High levels of radiated or conducted radio frequency interference as defined in EN50082 2 may reduce the accuracy of low level me
146. lock and the main pcb can be removed from a universal IMP whilst the IMP is in the rack Simply undo the two endcap securing screws and withdraw the pcb from the IMP case Initially some effort may be required to separate the two pcbs from each other JWS 3595 Installation Guide Issue RM Siting and Securing anIMP 3 19 3 20 Siting and Securing an IMP JWS 3595 Installation Guide Issue RM IMP Connections Contents 1 IMP Connector Blocks aaa 4 3 2 Cable Entry Sealing i 4 4 2 1 Cable Gland Details 359563 Series Connectors sss 4 5 2 2 Considerations for Large Diameter S Net Cables 4 5 2 3 Preparation of Large Diameter S Net Cables 4 6 3 S NetCa blih e EE 4 7 di S Net Gonrnectlons Pr Deje De den Pn ee ed ie cb cce 4 7 3 2 S Net Termination itte et teet Pho tct ie feed lee dier enata 4 8 3 3 In Line Connections for Occasional IMPS 4 10 4 IMP and IMC Power Supply nennen nnns nene ns 4 11 4 1 Power Supply Units Available eene 4 12 4 27 VIMP Power Supp HE ei frei iet etc tete ce tine tede tie 4 14 5 Sensor Connections anao utere eder ee rie peter steal 4 14 6 IMP Address Switches i 4 15 List of Figures Figure 4 1 Sealing the IMP connections with protective boots i 4 4 Figure 4 2 Cross sections of typical lea
147. logic 1 short circuits the output terminal to common and opens for a logic 0 The signals applied to the inputs can take one of two forms a Asa volt free contact switch In this case the logic level recorded will be a 1 with the contact open and a 0 with the contact closed b Asa voltage input In this case a logic 0 will be recorded when the voltage V is OSV lt 3V and a 1 when the voltage is 9 lt V lt 120V 2 INTERNAL ORGANISATION Each pair of channels is applied to a hybrid circuit which conditions the signal for the rest of the circuit The outputs of the 16 hybrid circuits are multiplexed and the resultant bit stream is monitored by a microprocessor The network communications is handled by a logic array Hybrid Communications E Micro processor DC supplies Hybrid Fig 9 1 Schematic of the IMP operation JWS 3595 Installation Guide Issue RQ IMP 3595 2B Connector Block 3595 3F 9 3 3 LOGIC LEVEL CONVENTION When relating logic levels to input or output currents and voltages IMPs conform to the positive logic convention By this system logic 1 represents the presence and logic 0 the absence of the current or voltage Logic 1 is always more positive than logic 0 as shown in Figure 9 2 The threshold levels for logic 1 and 0 are given in the Specification Appendix B A logic 1 ve Volts logic 1 or lo
148. lution 200ms 4ms ims ims Figures assume an equal Mark Space ratio indicates default setting Continued on next page JWS 3595 Installation Guide Issue RF Specifications for IMPs type 1A B C D E F G amp 2A B C 9 Frequency Figures are for the default sample rate of 100kHz Gate Time 10ms 100ms 1s 10s Minimum frequency 100Hz 10Hz 1Hz 0 1Hz Resolution 100Hz 10Hz 1Hz 0 1Hz Limits of Error 0 004 rdg resolution Frequency signals with a value less than 0 1Hz should be measured using the Event Capture mode All Limits of Error assume an equal Mark Space ratio Period Figures are for the default sample rate of 100kHz Periods averaged 1 10 100 1000 Resolution 10us ius 0 1us 0 01us Limits of Error 0 004 rdg resolution Period measurements have a programmable timeout applied The timeout must be at least double the expected period Timeouts of 200ms 2s 20s and 50s are available The maximum period is therefore 25s Period measurements greater than 25s should use the Event Capture mode All limits of Error assume an equal Mark Space ratio C 10 Specifications for IMPs type 1A B C D E F G amp 2A B JWS 3595 Installation Guide Issue RF 4 35952B Switch Input Output IMP Specification Note This specification also covers 359552B Switch Input Output IMC Number of channels may be 1 32 input or 1 4 output ssssss 32 Total Isolation channel to channel or ground
149. mal mode 50 or 60Hz 0 1 nennen nnne nnns gt 0dB Effective common mode rejection 50 or 60Hz 20 196 gt 80dB DC Voltage Temperature coefficient of ADC nens lt 0 0015 rdg 0 2uV per C 20ms 16 67ms Integration time Range Full Scale Sensitivity Limits of Error 20mV 22 000 1uV 0 02 rdg 5uV 200mV 220 00 10uV 0 02 rdg 0 01 fs 2V 2 2000 100uV 0 01 rdg 0 01 fs 5ms 4 17ms Integration time Range Full Scale Sensitivity Limits of Error 20mV 22 000 2uV 0 0296rdg 20u V 200mV 220 00 20uV 0 02 rdg 0 04 fs 2V 2 2000 200uV 0 01 rdg 0 04 fs C 6 Specifications for IMPs type 1A B C D E F G amp 2A B JWS 3595 Installation Guide Issue RF 1 25ms 1 04ms Integration time Range Full Scale Sensitivity Limits of Error 20mV 22 000 8uV 0 0296rdg 80u V 200mV 220 00 80uV 0 02 rdg 0 16 fs 2V 2 2000 800uV 0 01 rdg 0 16 fs Resistance Temperature Coefficient sss lt 0 003 rdg 0 0007 RL per C The single lead resistance RL applies only to three wire configurations Any lead resistance imbalance should be added to the error in three wire configurations 20ms 16 67ms Integration time Range Sensitivity Limits of Error 250 1 25mQ 0 03 rdg RL 6mQ 2500 12 5mQ 0 03 rdg RL 0 01 fs 2 5kQ 125mQ 0 02 rdg 0 03 RL 0 01 fs 5ms 4 17ms Integration time Range Sensitivity Limits of Error 250 2 5mQ 0 03 rdg RL 24mQ 250Q 25mQ 0 03 rdg R
150. mode rejection of gt 60dB at the fundamental supply frequency and its harmonics Series mode rejection is not effective for the fast integration periods 4 17ms 1 25ms and 1 04ms Therefore in electrically noisy environments it is essential to use an effective integration period DRIFT COMPENSATION Variations in measurement results known as drift can be caused by changes in the internal temperature an IMP which in turn affect the performance of the ADC To compensate for this the IMP periodically measures two reference inputs and calculates from the results actually obtained the compensation to be applied for all readings Drift compensation measurements have very little effect on the input measurement rate and are transparent to the user AVOIDING INTERFERENCE Interference in your measurement results will be largely avoided and certainly minimized if you follow the simple installation rules given below To avoid ac interference e Use twisted pairs or screened leads to connect the sensor to the connector block terminals e Avoid running the input leads near other cables carrying heavy ac currents or high ac voltages To avoid dc interference e Try to avoid sources of thermal emf such as nickel iron relay contacts with copper connections e Avoid high humidity which can cause leakage across nominally good insulators e Avoid moisture on exposed terminals which may cause emfs to be generated by a corrosi
151. mpers in or leave them out as indicated DC LK1 4 AC t Oui A LK1 B LK1 C LK1 D LK1 E LK1 F LK1 G LK1 H LK1 I LK1 J LK1 K LK1 L LK1 M LK1 N LK1 O LK1 P LK1 pe Ei Ei EE r3 r5 EE EE r3 r3 r3 r3 c A LK2 B LK2 C LK2 D LK2 E LK2 F LK2 G LK2 H LK2 I LK2 J LK2 K LK2 L LK2 M LK2 N LK2 O LK2 P LK2 Co E E E E CO E E CO E E CC EC CH A LK3 B LK3 C LK3 D LK3 E LK3 F LK3 G LK3 H LK3 I LK3 J LK3 K LK3 L LK3 M LK3 N LK3 O LK3 P LK3 Co Co Coa E EC E E CC E CC EC CH Luka A EM Jumper groups A through P relate to analog ex input channels 1 through 16 and 17 through 32 LK MODE LINK SETTING ICP AC DC Si VOLTAGE RANGE LINK SETTINGS 10V 1V 0 5V 0 2V 0 1V 50mV 20mV DV 2V xLK2 xLK3 Fig 10 4 The jumpers and jumper settings of the VIMP input card 35959552 10 14 VIMPs 3595 1F G Connector Block 3595 3G JWS 3595 Installation Guide Issue RN 5 4 REASSEMBLING THE VIMP After the jumpers have been configured the VIMP must be properly reassembled to ensure that the interior stays free of moisture The procedure depends on the type of VIMP being configured 35951F dual case or 35951G triple case 5 4 1 Reassembling the 35951F VIMP The procedure for reassembling the 35951F 16 channel VIMP is as follows 1 Ensurethata serviceable neoprene bonded cork gasket is correctly positioned around the edge of the half shell attached
152. mple epoxy resin The actual adhesive used should suit both the sensor and the surface on which it is mounted and due consideration should be given to such factors as the humidity and temperature of the operating environment Most suppliers should be able to advise you on the most suitable adhesive to use and the method of application Track wider at er Gauge ends to optimise connection gauge linearity pads Strain measured along this axis gt Figure A 5 Typical etched foil strain gauge The unstressed resistance R of a strain gauge typically 120Q equals p a where p is the resistivity of the gauge material and and a are the length and cross sectional area of the track When a test piece undergoes strain the gauge attached to it is strained by the same amount Tensile strain causes the gauge to stretch which increases the length of track and reduces the cross sectional area and thus increases the gauge resistance Compressive strain produces the opposite effect and decreases the gauge resistance This variation in resistance with strain is linear over the operating range of the gauge 3 4 2 Strain Gauge Bridges For strain to be measured it must be translated from a variation in resistance to a variation in dc voltage This is done by connecting the strain gauge into a bridge circuit and energizing the bridge from a constant voltage or constant current supply See Figures A 6 through A 9 The reason for having a bridge is tha
153. mply with the installation instructions supplied with the unit The 359595B is designed to be installed close to the IMPs at the remote end of an S Net network It is enclosed in a protective cabinet together with a DIN rail for field wiring connections It can provide up to 50 Watts of power at 48Vd c but it is recommended that no more than 20 Universal IMPs 1H and 1J or 30 IMPs of any other type are connected to any one unit This is to avoid problems with excessive heat dissipation within the protective cabinet In addition to powering IMPs the 359595B can be used as a power source for transducer conditioning Full instructions are supplied with the unit Note The 359595A and B units are both configured for 250VAC input by the manufacturer They must be adjusted for the local mains supply voltage where necessary 4 1 1 Power Supply Connections Warning Before attempting to connect a power supply unit you must disconnect the ac supply On the 3595 95A the connections are made directly to screw terminals contained in the unit To gain access to these terminals undo the two screws which hold the terminal block cover Figure 4 12 shows the connections to be made Replace the terminal block cover after the connections are made Power to S Net V1 000000009 H C S OFF E 230V 115V Connection to Selection Link N ac supply RS d Figure 4 12 Connections to the 3595 95A power unit 4 12 IMP
154. n M4 nut and star washer where a grounding point is not to be used Remember that this must be done both on the top and on the bottom half shells 11 Hang the VIMP over its mounting bolts and tighten the bolts up to secure the VIMP to its installation point 12 Where a VIMP grounding lead is used reconnect it and secure with the M4 nut and star washer JWS 3595 Installation Guide Issue RN VIMPs 3595 1F G Connector Block 3595 3G 10 17 6 LED DISPLAY Four LEDs on the end face of the VIMP convey certain user confidence information when illuminated The function of each LED is as follows HEARTBEAT Illuminated when VIMP processor is active COMMS Illuminated whilst VIMP and Host are communicating RESET Illuminated during reset POWER Remains illuminated whilst the VIMP is powered 10 18 VIMPs 3595 1F G Connector Block 3595 3G JWS 3595 Installation Guide Issue RN 7 LOCAL SETUP PANEL 7 1 LOCAL CONTROL CONNECTION FOR RS232 The VIMP can be controlled locally using the RXD and TXD lines through an RS232 serial connection made on the local setup panel This panel is on the lower end of the VIMP i e the end at which the measurement connections are made The RS232 connection is made through a sealed receptacle on the VIMP A five metre RS232 cable type 359594G is available from Solartron At one end this has a mating plug for the receptacle on the VIMP at the other end is a 9 way D type socket for connection to the c
155. n also be used as a watchdog output whilst Channels 19 and 20 can be used independently as high and low level alarm outputs 12 5 3 THE 35953J CONNECTOR BLOCK All connections to the 1H and 1J IMPs are made through the 3595 3J Connector Block See Figure 12 1 This is inserted into one end of the IMP case and is secured by two captive screws A conductive elastomer gasket between the end cap of the connector block and the IMP case provides a weather and RF proof seal ae Conductive elastomer gasket
156. n and end on ve x ve edge Fig 8 18 Single pulse measurement positive pulse Time Out The following fixed time out periods are available 200ms 2s 20s and 50s The default value is 2s If one period is to be examined the time out must be at least double the expected period For more than one input period the time out must be greater than the input period multiplied by the number of periods examined For example to measure one input period of about 50ms a time out of 200ms would be satisfactory However to measure ten time periods of 50ms a time out of at least 50msx10 500ms would be required A time out of 2s would therefore be suitable IMP 35952A Connector Block 35953C CSB 3595 Installation Guide Issue RP 6 7 DIGITAL OUTPUT Each channel can be configured as a digital output to drive such things as indicators reed relays In this configuration the output consists of an open drain MOSFET see Figure 8 1 which can be regarded simply as a resistance switch For switch closed the resistance between O P and COM 100 For switch open the resistance between O P and COM 10MQ IMP i IMP i O P O P I I I I 10 10M I I I COM COM I I output set to switch closed output set to switch open Fig 8 19 Equivalent circuits of the digital outputs The rating of the FET is 80V 1W with a steady state current sink capability of 100mA Over voltage protection of the FET is provided by the 62V zener diode
157. nals measured downstream of the ac dc coupling Large dc offsets can be rejected by ac coupling the signals allowing a more sensitive range to be selected 4 2 SYNCH CHANNELS The synch channels provide for the input of trigger signals from the machine s being monitored Trigger signals enable measurements to be synchronized with the shaft rotation so that phase data can be obtained and multiple measurements can be synchronized across the entire machine Trigger signals are connected to the terminal sets SYNC1 through SYNC4 Individual terminals in the sets are labelled and S as for the analog input channels For the 32 channel VIMP four more trigger signals may be connected to four identical terminal sets on the second connector block For each synch channel jumpers are used to configure ac or dc coupling Jumper configuration is described in Section 5 of this chapter Synch channels are assigned to analog input channels by the task tour programming 4 3 EVENT TRIGGER The event trigger input is activated by a positive going digital input from the machine being monitored Using such a signal enables the VIMP to respond to a significant machine state such as machine on load In the EVENT terminal set there are two terminals labelled and which are connected internally to an opto isolator An event is signified by making the terminal more positive than the terminal by a pote
158. nce Rejection Specifications are for 1kQ imbalance in Hi and Lo leads 20ms 16 67ms Integration time Normal mode 50 or 60Hz 0 1 ui gt 60dB Effective common mode rejection dota Di Da n DLE CELIO gt 140dB 50 or GOH KC DE gt 140dB 50 06 e EE gt 120dB 5ms 4 17ms 1 25ms 1 04ms Integration times Normal mode 50 or 60Hz 010 gt 0dB Effective common mode rejection 50 or 60Hz 0 1 sse gt 80dB JWS 3595 Installation Guide Issue RN Specifications for IMPs type 35951H amp J B 3 DC Voltage Temperature coefficient of ADC sees lt 0 0015 rdg 0 2uV per C 20ms 16 67ms Integration time Range Full Scale Sensitivity Limits of Error 20mV 22 000 luv 0 02 rdg S5uV 200mV 220 00 10uV 0 02 rdg 0 01 fs 2V 2 2000 100uV 0 01 rdg 0 01 fs 12V 12 000 1mV 0 05 rdg 0 01 fs 5ms 4 17ms Integration time Range Full Scale Sensitivity Limits of Error 20mV 22 000 2uV 0 02 rdg 20uV 200mV 220 00 20uV 0 02 rdg 0 04 fs 2V 2 2000 200uV 0 01 rdg 0 04 fs 12V 12 000 2 5mV 0 05 rdg 0 04 fs 1 25ms 1 04ms Integration time Range Full Scale Sensitivity Limits of Error 20mV 22 000 HUN 0 02 rdg 80p1V 200mV 220 00 80uV 0 02 rdg 0 16 fs 2V 2 2000 800u V 0 01 rdg 0 16 fs 12V 12 000 8mV 0 05 rdg 0 16 fs DC Current Sensitivity assuming 1000 bunt 10nA Error as for DC Voltage error of shunt resistor leakage currents B 4 Specificati
159. ntial in the range 2 9Vdc through 5 5Vdc This range is defined by a 270Q resistor fitted in the R1 position on the connector board Other voltage ranges may be configured by changing the resistor value but the input current range thus obtained should always be 5mA through 15mA 4 4 ALARM OUTPUT When the VIMP detects an alarm state the alarm output s may be used to trip the machine being monitored and or to drive an alarm indicator The 16 channel VIMP has one alarm output whilst the 32 channel VIMP has two An alarm output is in the form of switched contacts controlled by an internal relay which are connected to the RELAY terminal set The terminals are labelled NC normally closed NO normally open and COM common with the alarm relay 10 8 VIMPs 3595 1F G Connector Block 3595 3G JWS 3595 Installation Guide Issue RN de energised NC is connected to COM and with the relay energised NO is connected to COM The action of the alarm relays is programmed by the task software in which the energised and de energised relay states are specified by ON and OFF Thus an alarm relay may be programmed to switch either ON or OFF for an alarm state JWS 3595 Installation Guide Issue RN VIMPs 3595 1F G Connector Block 3595 3G 10 9 5 JUMPER CONFIGURATION Jumpers i e wire links are used to configure the range and coupling for the analog input channels and the coupling
160. o that all four fixing screws can be inserted 2 On each support tray on the opposite side to the stiffening bars press in the nylon IMP guides If you wish you can press in just sufficient guides for the IMPs you currently wish to install Remember however that it is far easier to install the guides at this stage so if you intend to install more IMPs in the rack at a later date it is better to press in sufficient guides for them now 3 Screw the support trays to one of the side panels using the M4x8mm screws and crinkle washers provided Ensure that the grounding screw on the side panel and the nylon guides on the support trays are pointing towards the rack interior Start at one end and insert each M4 screw without fully tightening it until all four screws are inserted Then fully tighten all four screws 4 Screw the other side panel to the support trays in the same way as in step 3 Ensure that the grounding screws on the side panels are at the same end of the rack This is the rear end 5 Screw the grounding strip to what will be the top support tray at the rear using the M3x5mm and crinkle washers provided The strip must be oriented with the fixing holes at the bottom that is with inscription IMP EARTHING POINTS the right way up and below the grounding studs Procedure continued on next page JWS 3595 Installation Guide Issue RM Siting and Securing an IMP 3 17 5 2 6 Screw a plain fascia strip to the low
161. o work and check that you have a full kit of parts A 359591B should contain Two side panels each fitted with a rack ear Two measurement card support assemblies Two connector card support assemblies One pack of screws nuts and washers These items are identified in Figures 3 10 and 3 11 Should any item be missing contact your Solartron agent immediately When you are ready to start proceed as follows 1 3 12 Using the M5 x 10mm screws and M5 crinkle washers supplied fit the support assemblies to the side panels The numbers shown beside the screws in Figure 3 11 refer to the holes in the side panels Each panel has 48 holes along the top and bottom edges Numbering from front to rear hole 1 is under the rack ear and holes 24 and 25 are used by the jointing plate The measurement card support assembly is deeper than the connector card support assembly and is fixed at the front of the mounting frame adjacent to the rack ears the numbers printed on the front bar face inwards as indicated in Figure 3 11 The connector card support assembly is fixed so that the numbers face inwards and towards the rear of the mounting frame Attach the grounding pillar in either of the positions shown in Figure 3 11 The pillar assembly details are shown in Figure 3 10 Side panel BI TIS mmm 16mm M4 screw MA spring washer M4 plain washers Grounding lead Figure 3 10 Grounding pillar assembly Viewed from re
162. ock 3595 3G JWS 3595 Installation Guide Issue RN 4 Place the two nut plates in the support grooves at the connector block end of the lower VIMP housing section The nut plates should be oriented with the longer tab at the bottom 5 Check that the inside face of the top half shell has a rubber seal attached to the housing rib and a rubber sleeve fitted to each of the four inner housing posts Carefully fit the top half shell onto the lower one ensuring that the two nut plates locate correctly into their corresponding slots 6 Check again that the edge of the neoprene bonded cork gasket is flush with the outer edge of the VIMP on the three closed sides Then look into the open end of the VIMP and check the alignment of the two rubber seals These should press together on either side of the neoprene gasket to give a moisture tight seal around the input card 7 Carefully holding the VIMP assembly together turn it over so that it rests on its mounting brackets 8 Repeat steps 2 through 6 9 Fit an MS socket head screw into each of the screw holes in the VIMP housing that are shown numbered below Pinch tighten the screws in positions 3 4 and 11 then recheck the gasket and nut plate alignments Realign the gasket and nutplates as necessary easing the screws in positions 3 4 and 11 to do so 10 Tighten the MS nyloc nuts to a recommended torque setting of 3 5N m in the correct numbered sequence shown above Refit and tighten a
163. ollows Increment On receipt of a measurement trigger an event count is started Then on receipt of another measurement trigger the event count is stopped the result sent to the host interface and another count begun Totalise On receipt of a measurement trigger events are counted until a halt or incremental count command is received In the latter case the counter is cleared prior to starting the incremental count If a clear command is received at any time the counter is reset to zero and a new count started on receipt of the next measurement trigger The maximum number of events that can be recorded per channel by the event counting circuitry is 16 777 215 after which the count continues from zero No other indication of this is given Table 8 2 Count Rate v Sample Rate Sample Rate Max Count Rate Max Count Rate using one channel using 20 channels 20Hz 2 4 s 2 4 s 1kHz 124 s 124 s 10kHz 4900 s 750 s 100kHz 15000 s 750 s default value Debounce is applied to 20Hz and 1kHz sampling With debounce an event is considered to be valid only after four successive samples have shown the input to be at the same level CSB 3595 Installation Guide Issue RP IMP 35952A Connector Block 35953C 8 11 6 3 1 6 3 2 8 12 Maximum Count Rate Using One Channel With 20Hz 1kHz and 10kHz sampling the maximum count rate can be obtained only if the mark space ratio of the input signal is 1 1 Any dev
164. on Guide Issue RM Introduction 1 7 1 8 Introduction JWS 3595 Installation Guide Issue RM S Net Cable and IMP Power Contents 1 S Net Cable and IMP Power Consideratons i 2 3 2 Cable Selection Zeus ioni lee aule nei ie te 2 4 3 Power Supply Units i 2 7 3 1 IMP Power Supply Units i 2 7 3 2 Connection to AC Mains Supply nnne nennen 2 7 39 38 359595D VIMP Power Supply nennen nnne 2 9 List of Figures Figure 2 1 Minimum recommended wire gauge for a 24V power suppl 2 5 Figure 2 2 Minimum recommended wire gauge for a 48V power supply seen 2 6 Figure 2 8 Outline dimensions of the 359595D Power Supply Unit iii 2 9 List of Tables Table 2 1 Cables Recommended for S Net sss eene 2 3 JWS 3595 Installation Guide Issue RM S Net Cable and IMP Power 2 1 2 2 S Net Cable and IMP Power JWS 3595 Installation Guide Issue RM 1 S NET CABLE AND IMP POWER CONSIDERATIONS In most applications communication signals and IMP power are both delivered via the S Net cable The cable should consist of a twisted pair of multi stranded wires with a screen around them Supported cable types are listed in Table 2 1 Specifications for the cables are critical and are listed in Section 2 Unscreened cables can be used but not in electrically hostile environments where the communication signals may be subject to interference Where IMPs are to be power
165. on Guide Issue RP IMP 35952A Connector Block 35953C 8 1 Fig 8 2 Schematic of the IMP operation iii 8 4 Fig 8 8 Schematic of a status event circuit iii 8 4 Fig 8 4 Schematic of a sampling frequency and timer counter iii 8 5 Fig 8 5 Positive logic convention ii 8 5 Fig 8 6 Input channel thresholds sse nennen nnnm nennen nnns 8 6 Fig 8 7 Contact Closure 20Hz 1kHz sampling ssssssssssssssseseeee eene enne 8 7 Fig 8 8 Solid State Switching 10kHz 100kHz sampling sse 8 7 Fig 8 9 Connection Terminals iie tiet cec aiar et 8 8 Fig 8 10 Input channel threshold levels AAA 8 8 Fig 8 11 Input output channel circuit iii 8 9 Figi8 12 e Ee EE 8 10 Fig 8 13 Effect of mark space ratio on event count rate single channel i 8 12 Fig 8 14 Effect of mark space ratio on event count rate all channels used 8 12 Fig 8 15 Effect of mark space ratio on measurable input frequency iii 8 14 Fig 8 16 Effect of mark space ratio on minimum measurable period esses 8 15 Fig 8 17 Measurement of 10 periods iii 8 16 Fig 8 18 Single pulse measurement positive pulse iii 8 16 Fig 8 19 Equivalent circuits of the digital outputs AA 8 17 Fig 8 20 Digital output with the load energised from the IMP sse 8 17 List of Tables Table 8
166. on bush expands to seal the cable entry 2 2 CONSIDERATIONS FOR LARGE DIAMETER S NET CABLES The diameter of a low a c attenuation S Net cable 18 AWG is too large to allow the cable to pass through a multi teat boot or gland on an IMP connector block Fora 3595 Series connector block with multi teat boots fitted there are two solutions to this problem you can either use a uni teat boot which allows the passage of a large diameter cable or you can prepare the cable as described in Section 2 3 Preparing a cable reduces the diameter over a short length which is then able to pass through a multi teat boot or gland Uni teat boots are available under Part No 359594A This number orders a pack of twenty rubber sleeves for large diameter S Net cables CSB 3595 Installation Guide Issue RM IMP Connections 4 5 Uni teat boots can not be fitted in place of glands to 35963 Series connector blocks In this case therefore the only solution is to prepare the cable so that it passes through the gland see Section 2 3 2 3 PREPARATION OF LARGE DIAMETER S NET CABLES To allow a large diameter S Net cable to pass through a multiple teat boot or gland the cable should be prepared as shown in Figure 4 4 D Diameter too large to pass ya through teat or gland 1 Cut back the outer cover OE 2 Cut back the braid and fashion it into a pigtail BE 3 Solder a wire to the braid for the shield connection 4 Fit a pv
167. on process e Do not fix cables to vibrating equipment otherwise electrostatic potentials may be generated To avoid ac and dc interference e Always connect Guard Sense to the Lo line never leave it open circuit e Never leave unused channels open circuit always fit a Hi Lo Guard shorting link e Always connect the IMP case or the IMC frame to a local ground point JWS 3595 Installation Guide Issue RA Measurement Techniques A 21 4 5 1 Preferred Guarding Connections Figure A 20 below shows the preferred guarding arrangements for voltage and current based sensor connections to the IMP IMC input terminals a three wire voltage screened cable b two wire voltage twisted pair Optional overall 2 shield grounded local to IMP IMC Figure A 20 Preferred guarding arrangments A twisted pair is recommended for the Hi and Lo leads as it is less susceptible to interference The three wire arrangement a extends the guard circuit out to the sensor this arrangement is particularly effective when used with a screened cable grounded at the IMP IMC 4 5 2 Grounded Signal Guarding Where one side of the sensor output is referred to ground for example as in a grounded tip thermocouple use the guarding arrangement shown in Figure A 21 Remember however that the sensor is always the source of common mode interference and defines the measurement reference Shield Figure A 21 Grounded signal guarding
168. ons for IMPs type 35951H amp J JWS 3595 Installation Guide Issue RN Thermocouples The following temperature ranges are based on 20ms 16 67ms Integration times All values are specified in degrees Celsius Error quoted is conformity to IEC584 BS4937 IMC 359551A C amp E must be in draught free enclosure no forced cooling Type Mid Range Error Full Range Error B Pt 30 Rh Pt 6 Rh 400 to1820 lt 0 3 80 to 1820 lt 2 0 E Ni Cr Cu Ni 100 to 250 0 3 210 to 1000 0 5 J Fe Cu Ni 100 to 350 0 3 210 to 1200 0 7 K Ni Cr Ni Al 100 to 450 0 3 200 to 1370 1 0 N Nicrosil Nisil 180 to 1280 0 3 250 to 1300 0 8 T Cu Cu Ni 100 to 400 0 3 200 to 400 0 5 R Pt 13 Rh Pt 0 to 1600 1 0 50 to 1760 2 0 S Pt 10 Rh Pt 0 to 1760 1 0 50 to 1760 1 5 Sensitivity Types B E K N T A 0 1 C Sensitivity Types R S i nerina nina ile eh i tee ies 0 2 C Total thermocouple error equals Conformity plus voltage errors Additional error when using automatic Cold Junction Compensation Range gl fe Oe LR ai ica aa lalla lt 0 4 C SR EE lt 0 6 C External Cold Junction range i 30 C to 80 C Open circuit detection threshold eee 1 9kW 0 1kW JWS 3595 Installation Guide Issue RN Specifications for IMPs type 35951H amp J B 5 Resistance Resistance 4 wire Temperature coefficient 20ms 16 67ms Integration time lt 0 003 rdg per C
169. ons to the 35953E connector block are made by passing the leads through the protective boots and connecting them to the appropriate terminals within the block See Chapter 3 Section 3 The terminal assignments are shown on the connector block label 4 1 VOLTAGE CONNECTIONS For the voltage output connect the VOUT and VOUT terminals to the INPUT and INPUT terminals respectively of the device to be controlled see Figure 7 4 Each channel is isolated therefore either terminal can be connected to ground or ground need not be connected at all and the output allowed to float V OUT VOLTS INPUT V OUT Controlled da VOLTS INPUT Figure 7 4 Voltage output connections 4 2 CURRENT CONNECTIONS There are three ways in which the current outputs can be used a IMP supplied current as shown in Figure 7 5 Minimum Load 0Q Maximum Load 500Q Figure 7 5 Connections for IMP supplied current b Externally supplied current sink as shown in Figure 7 6 GI 18V 24V 30V Max36V Figure 7 6 Connections for externally supplied current sink UWS 3595 Installation Guide Issue RA IMP 3595 1D Connector Block 3595 3E 7 7 c Externally supplied current source as shown in Figure 7 7 Min 12V 18V 24V 30V Max36V Figure 7 7 Connections for externally supplied current source Note If the minimum load in the tables shown in Figures 7 6 and 7 7 is greater than the load in your applicat
170. ontrolling PC Users who wish to make up their own cable can obtain a mating plug for the receptacle on the VIMP from W W Fischer Electrical Connectors Ltd Unit 6 Stratfield Park Elettra Avenue Waterlooville Hants PO7 7XN Tel 01705 241 122 Fax 01705 257 596 Note that the cable you use must conform to the RS232 Standard The type of plug you can use has several variations although some aspects of its design are fixed by that of the receptacle One example of a suitable mating plug has the Part Number S 103 A 057 opt 6 7 U This breaks down as follows S straight plug unsealed This is one of the plug style options Some of the other styles available are SE sealed straight plug WS right angled plug and WSE sealed right angled plug For information on the other styles available contact W W Fischer 103 the series number of the plug which represents its size This is fixed by the size of the receptacle A the contact protection In general this means that the plug has pin contacts This is fixed by the socket contacts on the receptacle 057 the code for the contact configuration This is fixed by the contact configuration of the receptacle 6 7 the maximum diameter mm of the cable clamping collet This depends on the diameter of the cable you intend to use and should be specified as indicated in Table 10 1 JWS 3695 Installation Guide Issue RN VIMPs 3595 1F G Connector Bloc
171. oots and the terminals on the pcb Insulating covers are fitted to each side of the connector block assembly These are for safety and prevent the wires from becoming snagged between case and endcap when the connector block is reinserted in the case General instructions for making IMP connections are given in Chapter 4 12 6 3595 1H and 1J IMPs JWS 3595 Installation Guide Issue RM 3 1 THE 3595 553J CONNECTOR BLOCK The 3595 553J connector block is a scaled down version of the 3595 3J connector block However the layout of the two connector blocks is exactly the same The setup and connection procedure is exactly the same for each type with one exception the method of grounding the screens of the channel cables The reduced size of the 3595 553J connector block does not provide for the inclusion of the grounding points shown in Figure 12 1 This means that to conform with the EMC directive a different method must be used to connect the channel cable screens to ground It is suggested that the screens be connected together in the same area as that occupied by the grounding points on the 3595 3J connector block and a single grounding lead brought out via a boot and connected to a grounding stud on the case It must be ensured that the screening connections are insulated to prevent any short circuits on the connector block 4 MEASUREMENT PREPARATION This section describes the background of each channel mode and the connections to be ma
172. or other integration periods Note also that the common mode rejection of ac signals decreases as the frequency increases 4 3 AC SERIES MODE REJECTION The term series mode rejection also known as normal mode rejection is generally applied to the rejection of line frequency interference when this is acting in series with a wanted dc signal An IMP rejects series mode interference by integrating each dc measurement over a complete number of cycles of interference Integration means continuously monitoring the input signal over the measurement period and computing the mean value During this process the ac interference averages to zero Ac series mode rejection is effective only when the integration period of the IMP analog to digital converter is set to cover the period of the line voltage fundamental frequency see Figure A 19 By default the integration period is set to 20ms to reject 50Hz interference Two other integration periods can be selected by remote command 16 67ms for 60Hz supplies and 5ms for 400Hz supplies See Part 2 of the host interface manual for the relevant command 50Hz Interference Wanted dc signal time 20ms integration period Figure A 19 The rejection of ac series mode interference at 50 Hz A 20 Measurement Techniques JWS 3595 Installation Guide Issue RA 4 4 4 5 An integration period that is suited to the ac supply for example 20ms for 50Hz or 16 67ms for 60Hz gives a series
173. ore to deliberately insert a resistance R n of known value into the Lo input lead when common mode rejection is measured during tests on the IMP s ADC The common mode rejection figures for the various IMPs see Table A 3 are specified for an R value of 1kQ Usually the resistance of the Lo input lead is much less than 1kQ in which case the rejection is correspondingly greater Conversely the common mode rejection will be less than that specified if the resistance of the low input lead is greater than 1kQ JWS 3595 Installation Guide Issue RA Measurement Techniques A 19 Table A 3 Common Mode Rejection Rejection IMP and elects A 20ms Integration 5ms 4 17ms 1 25ms Type of interference 1 04ms Integration IMPs 35951A C and E and IMCs 359551A C and E de gt 140dB gt 140dB 50Hz 60Hz 0 1 gt 140dB gt 80dB 50Hz 60Hz 1 gt 120dB IMPs 35951C and E with HV connector block 35953D de gt 100dB gt 100dB 50Hz 60Hz 0 1 gt 100dB IMP 35951B and IMC 359541B de gt 120dB gt 120dB 50Hz 60Hz 0 1 gt 120dB gt 80dB 50Hz 60Hz 1 gt 100dB These figures assume that the guard terminal is connected to source and that there is a 1kQ imbalance in the input leads Note the reduced rejection of 50Hz 60Hz for integration periods other than 20ms The reason for this is that the rejection specified for 20ms integration period includes 60dB of series mode rejection which is not obtained f
174. other scanner has just measured a high voltage and insufficient settling time has been allowed for the accumulated charge in the ADC to discharge It is recommended that instruments which have channels connected in parallel with another instrument are used to monitor sensors with similar output levels do not mix high and low voltage sensors in this situation Also the timing should be arranged such that the two instruments do not scan together leave an adequate settling time gt 10ms between channels measurements and thus allow any charge on the measurement circuit to decay away JWS 3595 Installation Guide Issue RA Measurement Techniques A 25 A 26 Measurement Techniques JWS 3595 Installation Guide Issue RA Specifications for IMPs type 35951H amp J Contents 1 Analog Status Channels 1 18 nennen nene B 3 2 Digital Channels 19 20 eee a Aa E a a AA B 8 3 General Specifications nennen nnns entren B 10 List of Tables Table B 1 Channel Functionality of the Universal MP B 2 JWS 3595 Installation Guide Issue RN Specifications for IMPs type 35951H amp J B 1 Table B 1 Channel Functionality of the Universal IMP Measurement Channels Channels 1 18 19 20 Volts dc Current dc Thermocouple B E J K N T R S Thermocouple user 5th order polynomial Resistance 2 3 4 wire RTD PT100 3 4 wire RTD CU10 4 wire Thermistor user
175. ould occur simultaneously thus reducing the overall scan time to little more than 10 seconds FREQUENCY Frequencies can be measured from just under 50kHz down to 1Hz Several sampling rates are provided Table 8 3 with debounce being incorporated in the 20Hz and 1kHz rates Signals of less than 1Hz can be measured by using Event Capture Section 6 2 Table 8 3 Maximum Input Frequency v Sample Rate Sample Rate Max Input Frequency 20Hz 2 4Hz 1kHz 124Hz 10kHz 4 9kHz 100kHz 49kHz default value CSB 3595 Installation Guide Issue RP IMP 35952A Connector Block 35953C 8 13 The maximum input frequency which can be measured with a given sampling rate depends upon the mark space ratio of the input signal The maximum input frequency that is 2 4Hz 124Hz and so on can be measured only if the mark space ratio is 1 1 Any deviation from 1 1 in either direction will lower the maximum measurable input frequency as shown in in Figure 8 15 100 measurable 60 input 50 frequency of max 39 0 1 1 2 1 3 11 4 1 5 1 6 1 7 1 8 1 9 1 10 1 mark space ratio or vice versa Fig 8 15 Effect of mark space ratio on measurable input frequency The accuracy and resolution of results depends upon the choice of measurement time as shown in Table 8 4 The longer times give the greater accuracy less uncertainty in the final result Table 8 4 Result Resolution v Measurement Time Measurement Time Result
176. pplied to 20Hz and 1kHz sampling in which case a status decision is taken only after four successive samples have shown the input to be at the same level The rate at which signal status is determined depends upon the frequency with which the host issues status measurement commands 8 8 IMP 35952A Connector Block 35953C CSB 3595 Installation Guide Issue RP A SV 20mA short circuit protected power supply is available at the connector block to facilitate the detection of contact closures in the external plant Up to twenty pairs of contacts can be connected but each pair must have its own current limiting resistor as shown in Figure 8 11 this avoids one contact closure shorting out the 5V supply to the other contact pairs The voltage drop caused by the current limiting resistor must not be so large that the input threshold level cannot be reached see Figure 8 10 The optimum value is 4 7kQ which limits the supply current to 1mA hence if all twenty pairs of contacts are closed simultaneously the current drawn is still only 20mA 5V OUT Current limiting resistor Note the total load across the 5V out terminals should not be less than 2500 Contact pair controlled by cam wheel 4 Split pad on connector block short out for TTL input Terminals of status channel Fig 8 11 Input output channel circuit Where the status of a TTL signal is to be determined short circuit the relevant Channel split pad in the connec
177. preselected by split pads SP19 and SP20 Signal compatibility is thus offered for TTL levels Figure 12 11a or 12V levels Figure 12 11b To avoid errors ensure that the input signal always occurs outside the Indeterminate region within this region a signal may be interpreted as either logic 0 or logic 1 JWS 3595 Installation Guide Issue RM 3595 1H and 1J IMPs 12 15 4 7 3 Contact Closure Connections A SV 20mA limited power supply is available at SK6 on the connector block This allows contact closures to be detected in the external plant Each pair of contacts must have its own current limiting resistor See Figure 1212 This avoids one contact closure shorting out the SV supply to the other contact pair The voltage drop caused by the current limiting resistor must not be so large that the input threshold level cannot be reached A suitable value is 4 7kQ which limits the supply current to 1mA with both pairs of contacts closed the current drawn is 2mA Under normal operating conditions the current drawn must not exceed SmA Should the rails become shorted no damage will occur but the unit may malfunction Where the status of a TTL signal is to be determined short circuit the relevant Channel split pad in the connector block As a rule a resistor should be fitted between the signal and the TTL 5V supply unless the TTL output is from a buffer device for example an LS244 Other TTL or LS TTL devices have a low output cu
178. ques A 9 To achieve adequate temperature compensation it is important that the common dummy enjoys the same environment as the active gauges In an industrial application this is best done by mounting the common dummy in the same vicinity as it s active companions it is then known as a local dummy The 3595 1B also gives the option of using a remote common dummy connected at the IMP This configuration could give problems with ordinary gauges due to the difficulty of ensuring that the environment of the remote dummy is the same as that of the active gauge s However with temperature compensated gauges the problem is reduced to ensuring that the temperature of the remote dummy which can be a good quality resistor is reasonably stable Since the OV current return for the active gauge is sensed at the gauge and the OV return for the common dummy is sensed at the dummy the difference in lead lengths and any variation in lead resistance do not effect the strain voltage 3 4 4 4 Three wire bridge The three wire bridge Figure A 9 is a another variation of the half bridge It is similar to the half bridge described in Section 3 4 4 2 but the number of leads is reduced to three x Ia Dual Ia current Ig Ig source H H Strain i L voltage Active Active gage gage or local dummy gage Current Ig IR return a Half Bridge b Quarter Bridge Figure A 9 Three wire bridge configuration half and quarter bridge The resistance of t
179. r block from the VIMP casing Initially it may be necessary to undo the screws with a screwdriver Access to the measurement connection terminals is obtained by removing the two cover securing screws and lifting the cover clear The VIMP measurement connections are as follows e 16 32 analog input channels e 4 8 synchronization input channels e leventinput e 2 alarm output s The numbers in brackets indicate the channel complement of the 35951G VIMP Details of each type of VIMP measurement connection are given in Section 4 Information on measurement connections generally is given in Chapter 4 of the 3595 Installation Guide together with details of the S Net connections and VIMP IMP addressing Note that the connection of S Net to a 35951G 32 channel VIMP and the VIMP address setup must be made at the connector block relating to the lower 16 channels This is the connector block that is located in the upper section of the case when the VIMP is laid flat on its mounting brackets No S Net connection should be made to the other connector block and the address switch settings on this block are disregarded JWS 3695 Installation Guide Issue RN VIMPs 3595 1F G Connector Block 3595 3G 10 5 CH 12 CH 13 CH 14 CH 15 CH 16 S S S S d S
180. refore each channel should be used either for voltage or for current output not both When a specific current output is requested with the command CHnIOx the voltage across the current terminals is adjusted to give the specified current through the current load To protect the current output against externally applied voltages caused for example by a short cicuit to the VOUT terminal a current limiter limits the output current to 25mA JWS 3595 Installation Guide Issue RA IMP 3595 1D Connector Block 3595 3E 7 3 2 7 4 INTERNAL ORGANISATION The IMP is shown schematically in Figure 7 2 and consists basically of e The microprocessor e A logic array to handle network communications e Four analog output channels Digital Control Output V Channel 1 Communications Output V Micro Channel 2 processor Output V Channel 3 DC supplies Output V Channel 4 Figure 7 2 Internal organisation schematic of the 35951D IMP 3595 1D Connector Block 3595 3E JWS 3595 Installation Guide Issue RA 3 DEFAULT OUTPUT VALUES AND MINIMUM CURRENT For one second after power up the values of voltage and current present at the channel outputs are volts 10V and current OmA The outputs then assume their default state Depending on the application the default state may be zero output or a low current and voltage The choice is made by opening or closing a split pad on the 35953E connector block The default ou
181. rface is placed between two IMPs Figure 4 8b The interface is supplied with the terminator in circuit See the appropriate interface card operating manual for details A terminator must also be fitted to the S NET OUT terminals of the IMP s at the end s of the S Net cable In the configuration shown in Figure 4 8a the IMP at the opposite end to the Interface must have a terminator fitted whilst in the configuration shown in Figure 4 8b the IMPs at either end of the S Net must each have a terminator fitted Two terminators part number 35900222 are supplied with the host computer interface card as part of the accessory kit They are of the molded type and fit into the S NET OUT terminals of the IMP s at the end s of the network as shown in Figure 4 9a Suitable termination can also be provided by a 120 1 4W resistor in series with a 0 1uF 100V capacitor as shown in Figure 4 9b CSB 3595 Installation Guide Issue RM IMP Connections 4 9 a Encapsulated b Terminator 1200 O 1uF 35900222 D SLT KI ea Internal Internal Connections Connections Figure 4 9 Terminating the S Net at an IMP 3 3 IN LINE CONNECTIONS FOR OCCASIONAL IMPS At a site where an IMP is used only occasionally it is permissible for S Net to be connected by means of in line connectors This allows the IMP to be inserted into the network when required and removed when it is not Figure 4 10 shows the simple connections involved Fl
182. rib Carefully fit the top half shell onto the lower one ensuring that the two nut plates locate correctly into their corresponding slots 5 Check again that the edge of the neoprene bonded cork gasket is flush with the outer edge of the VIMP on the three closed sides Then look into the open end of the VIMP and check the alignment of the two rubber seals These should press together on either side of the neoprene gasket to give a moisture tight seal around the input card 6 Fit an MS socket head screw into each of the screw holes in the VIMP housing that are shown numbered below Pinch tighten the screws in positions 3 4 and 11 then recheck the gasket and nut plate alignments Realign the gasket and nutplates as necessary easing the screws in positions 3 4 and 11 to do so JWS 3595 Installation Guide Issue RN VIMPs 3595 1F G Connector Block 3595 3G 10 15 Tighten the M5 socket head screws to a recommended torque setting of 3 5N m in the correct numbered sequence shown above Refit and tighten the M4 nut and star washer if grounding point is not to be used Hang the VIMP over its mounting bolts and tighten the bolts up to secure the VIMP to its installation point Where a VIMP grounding lead is used reconnect it and secure with the M4 nut and star washer 5 4 2 Reassembling the 35951G VIMP The procedure for reassembling the 35951G 32 channel VIMP is as follows 1 With the input card for channels 1 through 16 prot
183. ries with the signal being measured the wanted signal Cig This type of interference may be due either to common mode interference as explained above or to interference mixed with e The way in which series mode interference is dealt with is explained in Sections 4 3 and 4 4 4 2 COMMON MODE REJECTION IMPs reject common mode interference by using a floating analog to digital converter ADC as shown in Figure A 18 IMPs type 35951A B C and E Floating ADC guard connection connection I Recommended Alternative guard R T L I Figure A 18 The use of a floating ADC for common mode rejection The best rejection of common mode interference is obtained with Guard connected to the source of common mode Should this be impractical then guard must be connected to Lo With the latter method common mode and series mode rejection is slightly degraded due to the leakage through R and C the leakage resistance and stray capacitance Note that the maximum value of common mode voltage between the IMP inputs and S Net is specified as 500V which implies a maximum common mode voltage of 500V between the inputs and ground Within this limitation any leakage to ground should be negligable but it depends on the number of IMPs in the system and on their individual common mode voltages As explained in Section 4 1 common mode interference is measurable only when converted to series mode interference It is standard practice theref
184. rrent when driven high and for these devices a 4 7kQ resistor should be fitted between the signal and TTL 5V supply This ensures that the TTL signal voltage reaches the Logic 1 threshold pee ee i Contact closures in external plant Spit pads SP19 and SP20 relate to channels CH19 and CH20 Close a split pad for the relevant channel to oper ate from a TTL input i m 1 COM IN OUT COM IN OUT Fao d i go et att e Lala Lig ad lt Wa 8 W ed BLET ka Lea La Ld amp Figure 12 12 Example of status input connections Channels 19 and 20 12 16 3595 1H and 1J IMPs JWS 3595 Installation Guide Issue RM 4 7 4 Event Count This facility permits a number of events to be counted The events transitions to be included in the count can be ve ve or both Two types of count are offered increment or totalise These operate as follows Increment On receipt of a measurement trigger an event count is started Then on receipt of another measurement trigger the event count is stopped the result sent to the host interface and another count begun Totalise On receipt of a measurement trigger events are counted until an HA halt command is received or until the channel mode is set to event count increment In the latter case the counter is cleared prior to starting the incremental count If a CL clear command is received at any time the counter is reset to zero and a new count st
185. rvals The frequency of examination is known as the sampling rate Several sampling rates are provided for all the measurement functions that is 20Hz 1kHz 10kHz and 100kHz When setting up the system to be monitored study Sections 4 7 1 1 and 4 7 1 2 to determine the best sampling rate to use for your particular application Having selected a suitable sampling rate you should obtain repeatable results 20Hz 1kHz Sampling Debounce is applied at these sampling rates giving protection against contacts bouncing on closure as may occur with industrial switches contactors reed relays etc With debounce applied four successive samples must detect the same logic level after a logic transition has occurred before that transition is recognised This ensures that no false transitions are recorded See Figure 12 10 Use 20Hz sampling for large contacts such as industrial relays Use 1kHz sampling for small contacts such as reed relays logic 1 logic 1 logic 0 logic 0 sampling II II ii I LI I counted 1 counted AE 4c erc la pulses pulses a No debounce applied three pulses output to the counter instead of one incorrect measurement b Debounce applied one pulse only output to the counter correct measurement Figure 12 9 Contact Closure 20Hz 1kHz sampling 12 14 3595 1H and 1J IMPs JWS 3595 Installation Guide Issue RM 4 7 1 2 10kHz 100kHz SAMPLING These sampling rates are intended for use
186. s Voltage between thresholds 0 and 1 0 8 and 2 0V or 3 0 and 9V MAXIMUM UE 25V or 100V Min input drive curente ii fi ede ettet teile be Pierides 6001LA Input sample rates programmable ssseeeeeneeeneerereeee 20Hz 1kHz 10kHz 100kHz 4 sample debounce is used for 20Hz and 1kHz rates Input functions Status Events time of ve or ve edge accuracy 1ms Ree UE 49kHz max Frequency gate times programmable n 0 01 0 1 1 or 10s Period resolution ee e tae ata aa 10ps Periods averaged sss 1 10 100 1000 ve or ve pulse Single shot minimum Width oo i 10ps Count totalize or increment 24 bits gt 16 million Outputs FET switch closed on logic 1 Maximum withstand 2 moine eii ated etaed v enel ies 60V Maximum sink per channel 100mA Digital Input Counting and Event Capture per channel Maximum count rate per IMP is 15 000 s and is governed by software constraints Thus for a worst case input all channels driven by the same signal maximum count per channel is restricted to 750 s Maximum number of buffered events is 1500 per IMP Sample Rates 20Hz 1kHz 10kHz 100kHz Count Parameters Maximum frequency 2 4Hz 124Hz 4 9kHz 49kHz Minimum period 400ms 8ms 200us 20us Resolution of period 50ms 1ms 100us 10ps Counts max rate 2 4 s 124 s 4900 s 15 000 s Event capture rate 5 s 100 s 100 s 100 s Event resolution 200ms 4ms lms lms
187. s gauges and or leads There is also the practical reason that with less gauges and or leads installation is much simpler and there is less chance of making errors There are a few trade offs however and these are pointed out in the following bridge descriptions Full Bridge The full bridge Figure A 6 uses the most hardware four gauges all mounted at the measurement site and six leads If you are using a full bridge device such as a load cell then this is the only configuration possible However if you are using discrete elements such as etched foil strain gauges then you have the option of using four active gauges to obtain a bridge sensitivity of 4xG or of using a mix of active and dummy gauges for example two active and two dummy gauges but with reduced sensitivity See Section 3 4 5 for gauge orientation lt TA i Ig HY Current i Strain voltage So Voltage sensing Four active i gauges G Ig y Figure A 6 Full bridge strain gauge configuration voltage energized With regard to temperature compensation ensure that all four bridge elements are mounted on the same material and are maintained at the same temperature Since the level of voltage energization is sensed at the bridge any variation in lead resistance has no effect on the strain voltage JWS 3595 Installation Guide Issue RA 3 4 4 2 Half Bridge The half bridge Figure A 7 uses just two gauges both mounted at the measurement site
188. s of Error Range Sensitivity 5000 0 250 25kQ 2 50 0 02 rdg 500 0 02 fs 0 02 rdg 500 0 04 fs 1 25ms 1 04ms Integration time Limits of Error Range Sensitivity 5000 10 25kQ 10Q 0 02 rdg 50Q 0 8 fs 0 02 rdg 500 0 16 fs Resistance Thermometer Devices RTD Resistance Thermometer Device 1000 platinum 4 wire Conformity for 1009 PRT RTD is to IEC 751 Temperature coefficient 20ms 16 67ms Integration time lt 0 03 C per C Range Sensitivity Limits of Error 100 to 150 C 0 1 C 0 3 C 490 to 600 C 0 2 C 1 2 C Resistance Thermometer Device 1000 platinum 3 wire Temperature coefficient 20ms 16 67ms Integration time Range Sensitivity lt 0 2 C per C Limits of Error 200 to 600 C 0 2 C 2 C Resistance Thermometer Device 100 copper 4 wire only Temperature coefficient over 100 to 150 C 20ms 16 67ms Integration time Range Sensitivity lt 0 02 C per C Limits of Error 200 to 600 C 0 2 C 2 C B 7 Specifications for IMPs type 35951H amp J JWS 3595 Installation Guide Issue RN 2 Digital Channels 19 20 Numberof channels one IRAK ala nici 2 19 and 20 Isolation channel to channel or ground esee 500V Common mode between IMPS 0rrrreeeeeee nie ceci reni e rire riiiiiii 500V M T B E to MIE2L E 5 ene 145 000hrs IMP 155 000hrs IMC Input
189. s sealed by the boot 5 Connect the remainder of the output leads as described in Steps 3 and 4 6 Refit the connector block cover remembering to locate the two nibs on the rear of the cover under the pcb before locating the screws in their respective bushes and tightening them down Note Users who require to use multicore armoured or other thick cables may choose the optional 35963 series of industrial glanded connectors these offer industry standard glands as an alternative cable entry Cable glands are described in Section 4 2 1 CABLE GLAND DETAILS 359563 SERIES CONNECTORS The 359563 Series connector blocks are each fitted with six nylon cable glands that provide a moisture proof seal for the cable entry see Figure 4 3 The glands are fitted with Nitrile compression bushes nylon skid washers and M16 nylon clamping bushes Four of the clamping bushes allow for a cable outer diameter of 3 5mm to 6 5mm whilst the other two allow for an outer diameter of 6 5mm to 10 5mm for the S Net connections in and out Unused glands must be sealed with the M16 stopping plugs provided CLAMPING BUSH PE ai se CABLE A S COMPRESSION BUSH NYLON SKID WASHER Figure 4 3 Cable gland details of 359563 Series Connectors To seal a cable effectively slacken off the clamping bush pass the cable through the clamping and compression bushes then having connected the cable to the terminals tighten the clamping bush until the compressi
190. s to be mounted Grounding enhances the screening effect of the enclosure thus improving the IMP s immunity to electrical interference Grounding can be done with a short length of wire equipped with ring terminals at either end First connect one end of the wire to the IMP enclosure grounding stud Once the IMP has been fitted into the mounting frame and drawn fully into place by the knurled connector block screws the free end of the grounding wire can be fastened to the adjacent grounding stud of the upper clamp bar Note that the IMP enclosure and the internal circuitry are electrically isolated from each other and can withstand a potential difference of up to 500V The mounting frame must be grounded locally Either one of two grounding points should be used These points consist of studs two supplied which can be screwed into tapped bosses at the rear of the frame side panels JWS 3595 Installation Guide Issue RM Siting and Securing an IMP 3 11 4 1 RACK MOUNTED IMCS Isolated Measurement Cards IMCs are mounted in a frame which in turn is mounted in a standard 19 inch rack The mounting frame is built up from a 359591B Rack Mounting Kit which is available as an accessory Kit assembly instructions and IMC fitting and removal instructions are given below in Sections 4 1 through 4 4 ASSEMBLING A 359591B RACK MOUNTING KIT Before assembling the rack mounting kit ensure that you have a clear level space on which t
191. se transitions are recorded See Figure 8 7 Use 20Hz sampling for large contacts such as industrial relays Use 1kHz sampling for small contacts such as reed relays 8 6 IMP 35952A Connector Block 35953C CSB 3595 Installation Guide Issue RP logic 1 logic 1 logic 0 logic 0 sampling III II III sampling mi III II counted A a i counted i p lses Fresco arene sega t Blees LS e e a No debounce applied three pulses output to the b Debounce applied one pulse only output counter instead of one incorrect measurement to the counter correct measurement Fig 8 7 Contact Closure 20Hz 1kHz sampling 5 2 10KHZ 100KHZ SAMPLING These sampling rates are intended for use with signals not subject to contact closure bouncing Hence debounce is not applied 100kHz sampling would normally be used but for signals prone to glitches spurious transitions 10kHz sampling might produce more consistent results For example glitch is glitch may be missed by sampling interpreted as logic 1 logic 1 logic 1 logic 0 logic 0 sampling sampling 100kHz 10kHz L counted i d counted pulses m Tre ee N pulses a Glitches can generate extra pulses if too high b The same waveform with a lower sampling a sampling rate is used giving an incorrect rate one pulse only is output to the counter measurement giving a correct measurement Fig 8 8 Solid State Switching 10kHz 1
192. sensing resistor is fitted between the Hi and Lo channel inputs This is normally done at the screw terminals on the connector block but there are sites on the reverse side of the pcb where the resistor can be soldered For optimum rejection of electrical interference the G guard terminal must be connected to L low as shown in Figure 12 3 G guard must never be left disconnected since it forms an integral part of the measurement circuitry Ideally the guard should be connected as shown for channel CH 1 but if this is impractical use the alternative guard connection shown for channel CH 2 Circuit Circuit Break Break i current to be i i measured 1000 Figure 12 3 Example of current connections 12 8 3595 1H and 1J IMPs JWS 3595 Installation Guide Issue RM 4 3 TEMPERATURE MEASUREMENT THERMOCOUPLE CHANS 1 18 For temperature measurements by thermocouple the IMPs can accommodate thermocouple types E J K R S T B and N The cold reference junction for thermocouples can take either of the two forms shown in Figure 12 4 Channel CH 1 in this example uses the connector block terminals Built in thermistors sense the temperature in the interior of the connector block and the IMP adjusts the measurement value so that it refers to 0 C The alternative is to use an external reference unit as shown for channel CH 2 Here copper leads are used to join the reference junctions to the connector block In
193. sent The IMC mounting frame must be fitted within an enclosure such that it is impossible to make contact with ANY part of the IMC circuitry during operation 3 16 Siting and Securing an IMP JWS 3595 Installation Guide Issue RM 5 1 RACK MOUNTED UNIVERSAL IMPS To allow Universal IMPs to be rack mounted a rack mounting frame is available for a standard 19 inch rack The mounting frame is built up from a 359591G Rack Mounting Kit which is available as an accessory Kit assembly instructions and IMP fitting and removal instructions are given below in Sections 5 1 through 5 4 ASSEMBLING A 359591G RACK MOUNTING KIT Before assembling the rack mounting kit ensure that you have a clear level space on which to work and check that you have a full kit of parts A 359591G Rack Mounting Kit should contain e Two side panels 35952320A e Two IMP support trays 35952321 A e Eight support tray stiffening bars 12872010A e One grounding point strip 35952322A e Three fascia strips one with Solartron logo 359523244 e Two rack ears e One pack of nylon IMP guides e One pack of screws and washers Should any item be missing contact your Solartron agent immediately When you are ready to start proceed as follows 1 On each support tray on the opposite side to the flanges screw four stiffening bars using the M3x8mm screws and crinkle washers provided Ensure that each bar is the correct way round longitudinally s
194. ssessssseeeeenes Serial multi drop Max distance 1 5km 4950 before repeater NR RS232C 9600Baud Power Supply Specifications The IMP power supply units available their applications and outputs are as follows C 16 Specifications for IMPs type 1A B C D E F G amp 2A B PSU Type Application DC Output s 359595A Installed at Host end of S Net 48V 3A 359595B Installed at remote end of S Net 48V 1 1A 359595D Local supply for VIMPs 12V 1 5A 12V 1A 5V 1 5A DN 150mA Ac voltage selection by link 115V 92V 132V 230V 176V 264V Supply frequency ere 45Hz 440Hz Maximum input VA E DE 250VA 359595B Di stc tdi at EUER SIDE RIED ees 140VA Connector type Molex Case conformance ie EE Bare frame 959595B Dire beet tee IP55 NEMA 4 Size Length mm Width mm Height mm 359595A 210 115 60 359595B D 300 300 200 Weight 359595A srl ali d iaia 1 2kg 359595B RE 10kg Storage temperature 22sesesseee n 40 C to 70 C Operating temperature outside unt 0 C to 55 C output power derates at 2 596 per C from 35 C Humidity for storage and operation 95 RH at 40 C non condensing JWS 3595 Installation Guide Issue RF Solartron Mobrey Limited 158 Edinburgh Avenue Slough Berks UK Tel 01753 756600 Fax 01753 823589 SL1 4UE e mail sales solartron com www solartronmobrey com a Roxboro Group Company Bestobell Mo
195. star washer must be fitted beneath the head of each foot fixing bolt on the inside of the unit See Figure 4 14 Star Washer s Mounting Foot Sa Plastic Washer Figure 4 14 Foot securing detail for the 359595D Power Supply Unit To maintain sealing a plastic washer must be fitted between the case and each foot on the outside of the power supply unit See Figure 4 14 SENSOR CONNECTIONS All connections from the measurement sensors for example thermocouples and strain gages are made at the IMP connector block As each IMP can receive an input from up to thirty two sensors it is advisable to keep a record of them For this purpose each IMP connector block has a label onto which details can be written using most types of pen The layout of the label corresponds to that of the connector block terminals Details of the sensor connections for each type of IMP are contained in Chapters 5 through 10 IMP Connections CSB 3595 Installation Guide Issue RM IMP ADDRESS SWITCHES To enable coherent communication between the host computer and the IMPs each IMP must have a unique fixed address The same thing applies to the VIMPs and the information given below applies equally to these units An IMP address is set up by means of the two rotary switches S1 units and S2 tens on the connector block pcb As an example the address switches Figure 4 15 are shown set to 16 8 2 7 3 S2 TENS 654 901 8 2 7 3 S1 UNITS 654 F
196. t the IMP If a screened cable is used to connect the gauges then the screen should be connected only to I on the connector block This method of connecting a half bridge ensures that the measurement results are unaffected by the lead resistances therefore the leads need not be identical A simplified three wire connection method for the half bridge is described in Section 3 4 3 This is a cheaper method but it does demand that identical leads be used Fig 6 12 Half bridge measurement connections five wire 6 12 IMPs 3595 1B Connector Blocks 3595 3B CSB 3595 Installation Guide Issue QF 3 4 3 Three Wire Connection of Strain gauges The three wire method for strain measurement Figure 6 13 uses a simplified method of wiring whereby three wires only are run from the connector block Use gauge factor G for one active gauge or 2G for two identical active gauges Note however that for correct 3 wire measurement it is essential that the wires x and y are of equal length and cross section This ensures that a resistive balance is maintained in the presence of temperature changes so that strain measurements are unaffected Ensure that wires x and y are of equal cross section and length CONNECTOR BLOCK CONNECTOR BLOCK a for a dummy installed at the b for a dummy or second gauge connec local to Fig 6 13 Three wire connection of strain gauges CSB 3595 Installation Guide Issue QF IMPs 3595 1B Connector Blocks 3595
197. t dc assuming 1002 shunt ii 0 to 20mA Thermocouple TYPOS 0 rrt trt RP EE hn B E J K N T R S Thermocouple Cold Junction L nene External or Automatic Thermocouple open circuit detection i programmable 35951C amp 35951E Number of channels uge cech f e ee ae ed ee dere iaei eva eoe ede a 20 SWITCHING Up reed relay three pole Reed relay lites s ui iaia et cotes 210 operations Maximum signal measured i 12V Maximum input Voltage eet reete peret ne orc d Ee eoe edel teet eng 14V Overload protection continuous eren nnns 50V Maximum voltage between any two inputs EEN Le 200V IE EE 500V Common mode between IMPS nennen 500V M T B F to MIL217E i 64 000hrs IMP 69 000hrs IMC Measurement Voltage dc without optional connechor sssssesssssssrissssssrrsssrrinssrinssrinnsrenns 0 to 12V Current dc assuming 1002 shunt ui 0 to 20mA Th rmocouple ypes ice Ente oet eb bte tes B E J K N T R S Thermocouple Cold Junction L ennen External or Automatic Thermocouple open circuit detection i programmable 35953D Optional High Voltage Connector Voltage douce deer E 0 to 250V Overload protection continuous nnns 250V Effective common mode rejection dc nnne gt 100dB 50 or 60Hz 20 196 gt 100dB Attenuation Factor
198. t must use an interface module The types available are listed in Table 1 1 Table 1 1 3595 Interface Modules Type Function 3595 4A Interfaces between S Net and any IBM Personal Computer 3595 4B Interfaces between S Net and any IBM Personal Computer and can be used in dual redundancy systems 3595 6A Interfaces between S Net and the DEC Q Bus thus linking S Net to industry standard DEC minicomputers 3595 8A Interfaces between S Net and the GPIB IEEE 488 or RS232 3595 9A Interfaces between S Net and the Ethernet Incorporates up to four 4A or 4B Interfaces thus allowing up to four S Nets to interface with the Ethernet Housed in 485mm wide rack 3595 9B Interfaces between S Net and the Ethernet Incorporates a single 4A or 4B Interface Housed in all mounted case sealed to IP53 Standard The installation and operation of each of these interfaces is described in the relevant operating manual See Table 1 5 in this chapter To obtain data from specific sensors within the monitored system the host sends appropriate commands to the relevant IMP s Each IMP has a unique address and contains a microprocessor that is able to interpret the commands addressed to it and to take appropriate action Nominated channels within the addressed IMP s are thus scanned and the measurement results in digital form are sent back to the host The functions of the various types of IMP are summarized
199. t of the measurement circuitry Reference Junctions 7 7 E 1 Metal B P4 AE i 1 Measurement Reference _ x ___ _f_ Measurement e reo 7 Junction Junctions s le lt Junction ness Metal A Fig 5 8 Temperature measurement with the 35953A connector block 4 LED DISPLAYS The four LEDs visible at the end face of the IMP convey certain user confidence information when illuminated They are allocated as shown in Table 5 1 Table 5 1 Meaning of the LED Display LED Meaning Comment 1 Power on O K 2 Calibration error Re calibrate IMP 3 ADC error Have IMP checked out 4 IMP scanning that is active O K 1 Historically known as cold junctions but now called more aptly reference junctions likewise the junction originally known as hot junctions is now called a measurement junction CSB 3595 Installation Guide Issue QF IMPs 3595 1A C E Connector Blocks 3595 3A D 5 7 5 8 IMPs 3595 1A C E Connector Blocks 3595 3A D CSB 3595 Installation Guide Issue QF IMP 3595 1B Connector Block 3595 3B also covers IMC 3595 51B and Connector Block 3595 53B Contents 1 InputGonnections iiiiiora ela oinline ede 6 3 2 Internal Organization er ee ee e ecc Elio leone 6 4 3 Measurement Preparations ii 6 5 deli Voltage ete eee te ues dee deisde ege 6 5 32 H6SIStance tne a rale e eb ee tdeo tiet etin dea 6 5 3 9 Temperature ogni omen r
200. t sink capability of 100mA Over voltage protection of the FET is provided by a 62V zener diode A 5V 20mA limited power source is provided at SK6 on the connector block for the energisation of low power transducers lamps and so on The power source is short circuit protected against overloads A typical arrangement of digital outputs with load energisation by the IMP 5V supply is shown in Figure 12 18 NOTE The total load across the 5v supply should not be less than 1kQ Low power devices CH19 CH20 COM IN OUT COM IN OUT LP att e Lia LX Lai TX Figure 12 18 Example of digital output connections JWS 3595 Installation Guide Issue RM 3595 1H and 1J IMPs 12 21 4 8 1 Watchdog To monitor its correct operation the IMP has two types of watchdog a hardware watchdog and a software watchdog These may be enabled as required During normal IMP operations both watchdogs are patted periodically by the software For the hardware watchdog this is generated internally by the IMP firmware The reassurance signal for the software watchdog originates from an ST command that must be sent by the Host Should a watchdog fail to be patted within a pre defined timeout period then a watchdog alarm is given For a hardware watchdog alarm the IMP is set to its power up default state for a software watchdog alarm it is not The timeout period for the hardware watchdog is fixed at 1 2 seconds whilst the timeout perio
201. t the changes in resistance with strain especially with a metallic gauge are inherently small and the A 6 Measurement Techniques JWS 3595 Installation Guide Issue RA 3 4 3 3 4 3 1 3 4 3 2 bridge allows the resultant small changes in voltage to be read directly strain voltages may thus be measured at the best possible resolution Strain gauge bridges are often built up by the user from individual elements for example the etched foil strain gauge shown in figure A 5 Alternatively load cells which work on the same principle are a complete bridge in themselves Each arm of a strain gauge bridge can be either an active gauge or a dummy Dummy gauges are either an unstressed gauge or a resistor of the same resistance as the active gauge The form of a strain gauge bridge depends on the application and to cope with all requirements the IMP type 35951B provides for full half and quarter bridge configurations Temperature Compensation With regard to strain gauging temperature variation in time and or physical location can result in three possible sources of error Fortunately it is possible to compensate for all of these but care must be taken The error sources and their compensation are described below in Sections 3 4 3 1 through 3 4 3 3 When compensation is properly applied all errors due to temperature variation should balance out so long as the operating conditions of the gauge s are not exceeded Differential Exp
202. te that resistance measurements are returned in units of kohms on all ranges 3 2 1 Resistance Measurement Four wire Connect the unknown resistance to the terminals as shown in Figure 6 4 The wires from the H and L terminals should be connected as close as possible to the body of the unknown resistance No guard connection is needed the circuitry associated with the Ip terminal automatically provides interference rejection as well as acting as current return Note that the four wire method has greater thermal stability and gives a more accurate measurement than the three wire method described in Section 3 2 2 r unknown resistance Fig 6 4 Resistance measurement connections four wire Three nominal measurement ranges are available 250 2500 2 5kQ and autorange A current drive of 0 8mA is automatically supplied by the IMP via the I and I terminals CSB 3595 Installation Guide Issue QF IMPs 3595 1B Connector Blocks 3595 3B 6 5 3 2 2 3 3 3 3 1 6 6 Resistance Measurement Three wire Three wire resistance measurement is sometimes preferred because three core cable is cheaper than four core the results however are less accurate than with the four wire method and have a reduced thermal stability The method of connection is shown in Figure 6 5 The three conductors should be identical so that the lead resistances may be effectively nulled d CR BE Eu Es Fig 6 5 Resistance measurement connections
203. tegral part of the measurement circuitry With the 35953D connector block the Guard is permanently connected to Lo internally and requires no action by the user e unknown voltage e unknown voltage e unknown voltage Note When voltages are measured via the attenuated 50 1 input all results received by the host must be multiplied by 50 Fig 5 5 Attenuated voltage measurement with the 35953D connector block CSB 3595 Installation Guide Issue QF IMPs 3595 1A C E Connector Blocks 3595 3A D 5 5 3 2 CURRENT The IMP derives the value of the current by measuring the voltage V developed across a fixed precision resistor R then calculating the ratio V R The ranges available are 200uA 2mA 20mA 100mA and autorange Scaling within the IMP assumes that the value of resistor R is 1000 Other values of resistance can be used but the results must be re scaled accordingly For example if a 1000Q resistor is used results received by the host must be divided by 10 For optimum protection against electrical interference when using the 35953A connector block connect the G Guard terminal to L Lo as shown in Fig 5 6 G Guard must never be left disconnected since it forms an integral part of the measurement circuitry In the 35953D connector block the Guard is permanently connected to Lo internally and requires no action by the user i unknown current A 1002 resistor must be soldered to the R termi nals on
204. ternal organization of the VIMP is shown in Figure 10 1 Each of the main functions of the VIMP is indicated by a named functional block and a simple description in terms of these blocks is given below The VIMP operates in accordance with a number of task tour programs each of which is executed as required by DIGITAL SIGNAL PROCESSING For normal operation with the VIMP in its On line mode the task programs are written into the VIMP memory from the Host computer via S Net and the S NET INTERFACE Alternatively with the VIMP in its Local mode the same programs can be written into memory via the RS232 INTERFACE The latter method is generally used for test purposes but it can also be used to operate the VIMP from a local Monitor PC Once the required task programs are present in the VIMP memory the program to be used is selected by an appropriate command either from the Host Computer or from the Monitor PC An EVENT INPUT allows an external event such as a critical machine state to select an appropriate task program This program would be one of those previously written into the VIMP memory Each task program allows the VIMP to acquire data for a specific machine state In accordance with the selected program the DIGITAL SIGNAL PROCESSING selects specific VIBRATION INPUTS in a specific order and for each input may select a specific TRIGGER INPUT On the occurrence of the selected trigger the vibration signal is measured by an
205. the 12V dc range voltages can be measured with a resolution of 1mV for example 5 001V 5 002V and so on These figures assume an integration time of 20ms 3 7 2 Accuracy Accuracy describes how closely the measured value approaches the actual value of a physical quantity Accuracy is quoted in the IMP specifications in terms of Limits of Error and for this reason it is sometimes known as the uncertainty of a measurement As an example the limits of error on the 20mV range with a 20ms integration period A 16 Measurement Techniques JWS 3595 Installation Guide Issue RA are specified as 0 02 rdg 5uV This means that if your measurement result measured on the 20mV range with an integration time of 20ms is 10mV then the actual value is somewhere in the range of values 9 993mV to 10 007mV The limits of error are 7uV The limits of error in the IMP specification are quoted for one year after calibration and are applicable after a one hour warm up period and with an ambient temperature of 20 C 3 C For ambient temperatures other than this a temperature coefficient must be taken into account If the 10mV result in the example above was obtained at an ambient temperature of 60 C then from the temperature coefficient of the ADC lt 0 0015 rdg 0 2uV per C the limits of error are increased by 14UV so that the actual value is somewhere in the range 9 979mV to 10 021mV For the limits of error of all types
206. the 48V output of the 3595 95B must be fitted with the common mode choke ferrite suppression core supplied The choke should be fitted between the PSU output terminals and the Klippon terminals so that the cable passes through the choke twice Pass the dc cable through the choke loop it round and pass it through again Ci 2 8 S Net Cable and IMP Power JWS 3595 Installation Guide Issue RM 3 3 359595D VIMP POWER SUPPLY The 359595D Power Supply Unit provides sufficient local power for the vibration measurement circuitry one VIMP or two of either type 35951F or 35951G Note that a VIMP must also receive a supply from S Net for the S Net interface circuit Figure 2 3 shows the outline dimensions of the 359595D Power Supply Unit in sufficient detail to allow the user to determine a suitable installation site 300 11 8 La 230 9 0 E A A 360 i 300 11 8 400 15 75 A N d1 9 0 35 25 4 1 0 d2 15 0 6 30 1 2 typical NOTE All dimensions are shown in mm with the equivalent dimension in inches shown in brackets Gland plata 225 8 9 overall including lid 75 3 0 86 28 28 3 4 1 1 1 1 1 1 M16 cable glands 3 off ea Figure 2 3 Outline dimensions of the 359595D Power Supply Unit JWS 3595 Installation Guide Issue RM S Net Cable and IMP Power 2 9 3 3 1 VIMP Pow
207. the connector Long dq SECH unit under test broken block pcb for each channel that is to measure current ECL i unknown current A 1002 resistor must be soldered to the HP and L terminals on the connector block pcb for each channel that is to measure current unit under test Fig 5 7 Current Measurement with the 35953D connector block 5 6 IMPs 3595 1A C E Connector Blocks 3595 3A D CSB 3595 Installation Guide Issue QF 3 3 TEMPERATURE The IMP calculates temperature by measuring and linearising the voltage produced by a thermocouple types E J K R S T B and N can be accommodated The reference junctions can be formed at the connector block terminals as shown in Figure 5 8a In this case built in thermistors 35953A connector block only sense the local ambient temperature Alternatively an external reference junctions can be used and held at a user defined temperature for example 0 C in a bath of melting ice as shown in Figure 5 8b Copper leads are used to join the cold junction to the connector block There are actually two reference junctions formed where the copper leads join Metals A and B these junctions must be maintained at the same temperature For optimum protection against electrical interference when using the 35953A connector block connect the G Guard terminal to L Lo as shown in Fig 5 8 G Guard must not be left disconnected since it forms an integral par
208. the links or jumpers are easily accessible and you can adjust them yourself The location of the power supply links for IMCs with a separate connector block is shown in Figure 3 12 The location of the power supply jumpers on the 359552B IMC is shown in Figure 3 13 The connections to be made for the IMC power supply are described in Chapter 4 Section 4 4 5 ENVIRONMENT To meet European standards for EMC the IMCs must be installed in a suitable enclosure for example the VERO IMRACK 3400 IMCs fitted in an IMC rack and enclosed in this way have been tested to EN 50081 2 Generic emission industrial EN 50082 2 Generic immunity industrial Although IMCs use the same printed circuit boards as IMPs they lack the environmental protection provided by the IMP housing Therefore some of the specifications are derated these are detailed in Appendix B The following precautions can be taken to minimise these effects 1 Avoid rapid movements of air across the IMCs do not use forced air cooling 2 Keep IMC enclosures away from areas of high humidity 3 Ensure that the enclosure is sealed as far as possible from dust dirt etc WARNING There is no integral shielding of the input connections on the connector card It is therefore vital that users are prevented from touching any part of the IMC circuitry which may carry voltages up to 500V Note that this may arise even with low signal levels if there is a high common mode voltage pre
209. tialization the ADC is disconnected from the H and L terminals and connected instead to the I and G terminals The bridge voltage can then be measured Net Sege ee bridge voltage measured here energization at initialization currents Fig 6 9 Schematic of the full bridge measurement circuit Initialization On initialization the IMP measures the gauge voltage Vg whilst the bridge is energized with constant current I The IMP microprocessor uses the following algorithm to calculate strain 4 Vx Vo GVg In pstrain 4 Vx Vo 1 0 i GVg where VO initial out of balance voltage Vg gauge voltage at initialization Vx strained out of balance voltage G gauge factor for one active gauge use 2G for two active gauges gauges must be use 3G for three active gauges identical use 4G for four active gauges CSB 3595 Installation Guide Issue QF IMPs 3595 1B Connector Blocks 3595 3B 6 9 The full bridge measurement connections to the IMP connector block are shown in Figure 6 10 Note that the I and G terminals must be connected to the I and I terminals at the bridge not at the IMP This is because I and G fulfill the dual function of measuring the gauge voltage during initialization and supplying the energisation current If a screened cable is used to connect the gauges then the screen should be connected only to I on the connector block Fig 6 10 The full bridge measurement connections 6 10
210. ting data from hand held vibration data collectors IMPs can receive their power either from the host via the S Net cable or directly from a local dc source Also available in the 3595 Series are the Vibration IMPs or VIMPs These can be mixed with IMPs in the same system but they are always powered from a local PSU the 359595D The functions of the two VIMPs currently available the 35951F and G are summarized in Table 1 3 A Serial IMP the 359593D provides an RS232 to S Net interface which allows hand held vibration data collectors to send data to a Host Computer Table 1 3 VIMP Functions VIMP Type VIMP Functions 3595 1F Provides sixteen channels of vibration measurement together with four trigger inputs one event input and one alarm output 35951 G Provides thirty two channels of vibration measurement together with eight trigger inputs one event input and two alarm outputs 1 4 Introduction JWS 3595 Installation Guide Issue RM 2 1 2 2 APPROACH TO INSTALLATION This manual contains full details of how to install an IMP system These include how to decide on the S Net cabling and IMP power requirement how to site and mount the IMPs and how to connect S Net and the sensor wiring to the IMP connector blocks Sections 2 1 through 2 3 below introduce each of these aspects in turn and point to the relevant chapter s in the manual S NET CABLES AND IMP POWER REQUIREMENTS If IMPs
211. tion at 326kHz of less than 9dB per kilometre e Mutual capacitance between conductors of less than 60pF per metre NOTE The power consumption of universal IMPs is 1 5 times that of other IMPs This is reflected in the graphs shown in Figures 2 1 and 2 2 Figs 2 1a and 2 2a relate to the universal IMPs and Figs 2 1b and 2 2b relate to other IMPs 2 4 S Net Cable and IMP Power JWS 3595 Installation Guide Issue RM a 405 Length of cable v No of UIMPs 24V supply amp External PSU 3Amps max ali A BIRRERIE Sexe de TE eed ON Ci non ios d 12AWG 3 4MM i 16AWG 1 3MM 30H BE SAS SE ed APs ERTA AAT SERATE rina CODE iii 20AWG 0 5MM iv 24AWG 0 2MM 25 M wu C M PCI C NC E Gd a 320 PERE ive ee A wwe ee SAS SW oa Be ERO SITTER SILE TIA E PE e z B ee de Ge e Re Nee d RM Md 10 e ET RE C RR S I OL 5 AN EC m a E CERA grae ul MIX AO GA o ZAIRE PORTIA dote aru UE uA BORD SCUSA E 100 200 300 400 500 600 700 800 900 1000 Length m b Length of cable v No of IMPs 24V supply amp External PSU 3Amps max D 16AWG 1 3MM ili 20AWG 0 5MM sess B Uli UD qaa CM ML E iv 24AWG 0 2MM E baee pe en Nee BH RR IRI xem D 100 200 300 400 500 600 700 800 900 1000 Length m Figure 2 1 Minimum recommended wire gauge for a 24V power supply for a Universal IMPs and b other IMPs JWS 3595 Installation
212. tion to the D type connectors 4 3 REMOVING IMCS WARNING Do not attempt to remove any connector card until you are sure that the power to both the S Net and the system being measured has been disconnected High voltages may be present at the input terminals To remove an IMC proceed as follows 1 Undo the measurement card securing screws 2 Separate the measurement and connector cards by pulling the measurement card extractor handles outwards i e away from each other This will lever the measurement card partially out of the mounting frame 3 If required slide the measurement card from the front of the mounting frame 4 If required slide the connector card from the rear of the mounting frame JWS 3595 Installation Guide Issue RM Siting and Securing anIMP 3 15 4 3 1 Removing the 359552B IMC To remove a 2B IMC proceed as follows 1 Disconnect the D Type connectors 2 Undo the measurement card securing screws 3 Push the card loose from the locating pins from the rear of the mainframe 4 If required slide the measurement card from the front of the mounting frame 4 4 SELECTING THE IMC POWER SUPPLY SOURCE Like the IMPs the IMCs can be powered either from the Host via S Net or from a local power supply unit Two internal links or jumpers in the case of the 359552B IMC must be inserted for power from S Net or removed for local power Unlike the IMPs there is no need to send an IMC back for modification
213. tiplied by the number of active gauges Note An active gauge is one that is subject to strain gauges used either as dummies or to provide temperature compensation are considered to be inactive Before starting to log readings from the bridges it is essential to record the unstrained initial outputs as these are required as references for subsequent calculations This recording is commanded by program instructions from the host For the bridge configurations shown on the following pages it should be noted that the G terminal is used for voltage sensing The I terminal automatically provides interference rejection as well as acting as current return for the specific bridge CSB 3595 Installation Guide Issue QF IMPs 3595 1B Connector Blocks 3595 3B 6 7 The energizing current can be set to 8mA or 1 6mA for the full bridge configuration For half and quarter bridge configurations the currents can be set to 4mA or 0 8mA Typically the larger of the two currents is used for bridges constructed of gauges from 120Q to 350Q the smaller of the currents is used for gauges of greater than 350Q In all cases ensure that the product of bridge resistance and energizing current does not exceed 2V as this is the maximum input voltage for the IMP Do not for example energize a 1kQ full bridge with a 4mA current as this will produce 4V at the IMP terminals Note 1 The dual current compliance voltage is greater than 17V i e if an e m f is
214. to the VIMP assembly The gasket must be located over the bosses with raised shoulders so that its outer edges coincide with the closed sides of the half shell and the cross piece at the open side is aligned with the rubber seal around the input card Spare neoprene gaskets can be obtained from Solartron under Part No 35952214 2 Place the desiccant bag on the pcb Depending on the length of time that has elapsed since the VIMP was last opened and the number of significant pressure changes it may be necessary to fit a new desiccant bag Part Number 450600420 If a new desiccant bag is not immediately available it is possible to reactivate the contents as follows open the bag and empty the clay granules onto a suitable tray then place the tray in a low temperature 140 C oven for between 7 and 8 hours finally allow the tray and clay granules to cool in a dry environment before returning the clay granules to the bag and closing it Note however that the ability of the clay granules to absorb moisture is degraded each time they are reactivated therefore this method should be employed only in an emergency and no more than twice with the same granules 3 Place the two nut plates in the support grooves at the connector block end of the lower VIMP housing section The nut plates should be oriented with the longer tab at the bottom 4 Check that the inside face of the top half shell has a rubber seal attached to the housing
215. to the communications module whilst a 3595 95D Power Supply local to the VIMP supplies the vibration measurement front end 1 1 1 S Net Power Source The power conveyed on S Net to the VIMP can be sourced by the Host computer itself or by an external supply unit connected to the 34954B Interface Details are given in the 34954B User Manual Chapter 2 Section 7 The S Net cable for supplying power to a VIMP must be given the same consideration as when supplying an IMP Guidance on the cable to use is given in Chapter 2 of this Installation Guide The connection details are given in Chapter 4 1 1 2 Local Power Source The 3595 95D Power Supply is able to supply the vibration measurement front ends of two VIMPs As a guide to mounting the 3595 95D the Installation Guide contains the following mechanical details Chapter 2 Section 3 3 dimensions Chapter 4 Section 4 3 1 feet fitting and grounding instructions As a guide to making the correct connections the local supply terminals on the 35953G Connector Block and the corresponding terminals on the 3595 95D Power Supply are clearly labelled The layout of the 35953G Connector Block is shown in Figure 10 2 Guidance on choosing a suitable local supply cable are given Chapter 2 Section 3 3 1 of the Installation Guide JWS 3695 Installation Guide Issue RN VIMPs 3595 1F G Connector Block 3595 3G 10 3 2 INTERNAL ORGANIZATION A simplified block diagram representing the in
216. tor block As a rule a resistor should be fitted between the signal and the TTL SV supply unless the TTL output is from a buffer device for example LS244 Other TTL or LS TTL devices have a low output current when driven high and for these devices a 4 7kQ resistor should be fitted between the signal and TTL SV supply This ensures that the TTL signal voltage reaches the logic 1 threshold Remember that the 5V OUT supply of the IMP may also be powering output circuits for example as shown in Figure 8 20 CSB 3595 Installation Guide Issue RP IMP 35952A Connector Block 35953C 8 9 6 2 8 10 EVENT CAPTURE The purpose of event capture is to determine when a logic transition occurs noting the date time to 1ms resolution and the polarity of the transition A special buffer used by all event capture channels stores the event information The buffer can store up to 1500 events and once full keeps a count of how many events are then discarded up to 64k The transitions recorded can be ve ve or both ve transition a signal which passes from logic 0 to logic 1 ve transition a signal which passes from logic 1 to logic 0 Note that the total number of events that can be captured depends on the capture rate Table 8 1 For details refer to the host interface logger operating manual Table 8 1 Capture Rate and Event Resolution v Sample Rate Sample Rate Maximum Capture Event Resolution
217. tputs and the corresponding split pad states are listed in Table 7 1 The state of split pad SP1 also decides the minimum current that can be requested with the command CHnIOx If the default output current is 4mA then the minimum current is 4mA also Table 7 1 Output Default States Split Pad Default Default Minimum State Voltage O P Current O P Current open OV OmA 0 1mA OmA closed 2V 0 1V 4mA 4mA Label showing state of split pad SP1 Cover retaining screw Split Pad SP1 masa L pal EE Ise pee Figure 7 3 Location of split pad SP1 in connector block 35953E JWS 3595 Installation Guide Issue RA IMP 3595 1D Connector Block 3595 3E 7 5 The location of the split pad SP1 is shown in Figure 7 3 To access the split pad undo the two captive cover retaining screws of the 35953E and lift the cover clear withdrawing the cover from the rear of the connector When replacing the cover remember to locate the two nibs on the rear of the cover under the pcb before locating the screws in their respective bushes and tightening them down A label on the 35953E shows the split pad state and the corresponding minimum current presently selected Remember to remark the appropriate label for example with a spot or cross if the split pad state is changed 7 6 IMP 3595 1D Connector Block 3595 3E JWS 3595 Installation Guide Issue RA 4 OUTPUT CONNECTIONS Analog output connecti
218. uges the 35951B energizes each bridge in turn just before measurement takes place JWS 3595 Installation Guide Issue RA Measurement Techniques A 7 3 4 3 3 3 4 4 3 4 4 1 A 8 Measurement Techniques Variation in Lead Resistance The resistivity of the copper wire leads connecting a strain gauge bridge to the IMP inputs tends to vary with temperature However this effects the strain indication only when the leads are actually included in the bridge network as in the case in the three wire bridge see Section 3 4 4 4 To compensate ensure that all input leads included in the bridge network are of the same length and are maintained at the same temperature To minimize heating of the wires the 35951B energizes each bridge in turn just before measurement takes place Which Type of Bridge Should Use The newcomer to strain measurement might justifiably be confused over which type of strain gauge bridge best suits a particular application full bridge half bridge four wire quarter bridge or three wire bridge This section describes the advantages and possible disadvantages of each type of bridge in turn and should help you to reach a rational decision Incidentally the name given to each type of bridge relates to that part of the bridge which is located at the measurement site Generally the reason for using a half bridge rather than a full bridge or a quarter bridge rather than a half bridge is a financial one you need les
219. uide the reader in avoiding damage to the equipment WARNINGS guide the reader in avoiding a hazard that could cause injury or death AVOID UNSAFE EQUIPMENT The equipment may be unsafe if any of the following statements apply Equipment shows visible damage Equipment has failed to perform an intended operation Equipment has been subjected to prolonged storage under unfavorable conditions Equipment has been subjected to severe physical stress If in any doubt as to the serviceability of the equipment don t use it Get it properly checked out by a qualified service technician LIVE CONDUCTORS When the equipment is connected to its measurement inputs or supply the opening of covers or removal of parts could expose live conductors The equipment must be disconnected from all power and signal sources before it is opened for any adjustment replacement maintenance or repair Adjustments maintenance or repair must be done only by qualified personnel who should refer to the Maintenance Manual EQUIPMENT MODIFICATION To avoid introducing safety hazards never install non standard parts in the equipment or make any unauthorized modification To maintain safety always return the equipment to Solartron for service and repair CSB 3595 Installation Guide Issue RF 3595 Installation Guide Contents Introduction The IMP System Approach to Installation Associated Documentation S Net Cabling and IMP Power Requirements
220. unting Frame into the Rack 3 18 5 3 Fitting the Universal IMPS into the Rack 3 19 5 4 Removing the PCBS from Rack Mounted Universal IMPS ui 3 19 List of Figures Figure 3 1 Location of bolt holes on IMPs type 1A through E 2A and 28 3 4 Figure 3 2 Location and dimensions of VIMP bolt brackets ssssssseeeeee 3 5 Figure 3 3 Location of bolt holes on Universal IMPs type 1H and Il 3 6 JWS 3595 Installation Guide Issue RM Siting and Securing an IMP 3 1 Figure 3 4 Assembly of support trays and side panels for IMP mounting frame 3 8 Figure 3 5 Sliding the plastic runners into an IMP mounting frame esses 3 9 Figure 3 6 Fixing the rear trims on an IMP mounting frame 3 9 Figure 3 7 Fixing the front trims and rack ears on an IMP mounting frame ssse 3 10 Figure 3 8 Fitting the clamp bars on an IMP mounting frame 3 10 Figure 3 9 Sliding an IMP into an assembled mounting frame essen 3 11 Figure 3 10 Grounding pillar assembly Viewed from rear of mounting frame 3 12 Figure 3 11 Assembly of IMC mounting frame sesseeeeeeeeneeeeneereeeesreesnsssrissrrnssresrnnsensrennes 3 13 Figure 3 12 IMC Dimensions iii 3 14 Figure 3 13 359552B IMC Dimensions iii 3 14 Figure 3 14 An assembled 359591G rack viewed from the rear sse 3 18 3 2
221. up to five measurements one in each array can then take place simultaneously For more information on frequency period measurement see Section 6 4 to channel select other channel select control channels counter overflow 12 bit counter sample frequencies sampled channel inputs data bus Clock Timer counter divider control I IRQ measurement clock complete Fig 8 4 Schematic of a sampling frequency and timer counter 3 LOGIC LEVEL CONVENTION When relating logic levels to input or output currents and voltages IMPs conform to the positive logic convention By this system logic 1 represents the presence and logic 0 the absence of the current or voltage logic 1 is always more positive than logic 0 as shown in Figure 8 5 The threshold levels for logic 1 and 0 are given in the Specification Appendix B logic 1 ve 1 Volts logic 1 or logic 0 or that is indeterminate Current logic 0 Fig 8 5 Positive logic convention CSB 3595 Installation Guide Issue RP IMP 35952A Connector Block 35953C 8 5 4 LOGIC THRESHOLD LEVELS INPUT CHANNELS All inputs are compared with pre set voltage threshold levels in order to ascertain the logic states of those inputs Two pairs of threshold levels are offered for each channel they can be set individually by means of split pads SP1 to SP20 one split pad per channel in the connector bloc
222. with signals not subject to contact closure bouncing Hence debounce is not applied 100kHz sampling would normally be used but for signals prone to glitches that is spurious transitions 10kHz sampling may produce more consistent results See the example in Figure 12 10 glitch is missed by sampling glitch may be interpreted as logic 1 logic 1 logic 1 logic 0 logic 0 sampling ii II sampling 100kHz 1 10kHz L counted 1 counted pulses eL cem pulses Sud ae EE a Glitches can generate extra pulses if too high b The same waveform with a lower sampling a sampling rate is used giving an incorrect rate one pulse only is output to the counter measurement giving a correct measurement Figure 12 10 Solid State Switching 10kHz 100kHz sampling Note Whilst a lower sampling rate does not guarantee correct results when glitches are present it does increase the probability of obtaining correct results 4 7 2 Status Measurement The purpose of a status measurement is to determine the logic state of a signal Inputs are interpreted as logic 1 or logic 0 as shown in Figure 12 11 Logic 1 Logic 1 9 0V Indeterminate Indeterminate 0 8V 3 0V Logic 0 Logic 0 a input thresholds with split pad shorted b input thresholds with split pad open circuit Figure 12 11 Logic level interpretation on Channels 19 and 20 The logic levels to which Channels 19 and 20 respond may be
223. yleads on IMP with Male M and Female I F connectors Connector Detail I I I S Net IN S NetOUT IMP Figure 4 10 In line connections for occasional IMPs The connectors should be of good quality and electrically matched and must not incorporate filters or attentuators Where the IMP is sited in a clean and dry environment a professional audio video connector such as the Neutrik ITT XLR Series can be used Where moisture is likely to present then an appropriate sealed connector must be used In a particularly hostile environment it is recommended that the in line connectors are protected to the same degree as the IMPs and S Net cable 4 10 IMP Connections CSB 3595 Installation Guide Issue RM 4 IMP AND IMC POWER SUPPLY Normally power is supplied to each IMP or IMC down the S Net cable sourced via a socket on the rear panel of the interface card or from the hosts power supply Alternatively local power can be supplied to IMPs or IMCs at their EXT DC POWER terminals To set up an IMP or IMC to receive its power supply from one source or the other two links must be adjusted The procedure for this is as follows e Return IMPs Type 3595 1A 1B 1C ID IE 2A 2B and 3D to a Solartron Service Centre for modification Do not attempt to open any of these units as you may destroy the sealing of the cork gasket e Universal IMPs Type 3595 1H and 1J can be opened up and the links adjusted as described in C

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