LVDT/A & LVDT/D Amplifier / Signal Conditioner Manual
Contents
1. x x Cross SC Clan e e a CTO asiz Jo ji ji lo h h fs fh x x x x onz 12 a ao a 1 i x d 507z fo Jo jo jo fo fo lx Jx 100z j1 Jo fo f1 Jo Jo e jx 500z fo 1 1 fo fo fo Jx Jx 200z Ji dli h 1 fo jo jx x Xx x x Xx Xx x Xx Xx 7 Mantracourt Electronics Limited LVDT A LVDT D User Manual Chapter 5 Specification for LVDT A amp LVDT D Parameter Min Typical Max Unit Power supply ac LVDT A only 110 230 Vac 50 60Hz 99 198 110 230 126 253 VAC Power supply dc LVDT A and D 18 24 28 V DC Power supply current dc depends on loading 138 145 150 mA 200 R Excitation 4 5 V rms LVDT Frequency Selected by Switch 1 2 3 4 5 kHz 1 5 kHz 20 LVDT Impedance 50 200 Ohms LVDT Sensitivity switchable 0 02 10 V Gain adjustment Pot fine adj 25 FSD Offset adjustment Pot fine adj 10 FSD Offset adjustment Switchable coarse adj 30 FSD Output load voltage output 0 2 mA Output load current output 0 z 500 Ohms Bandwidth No filter 3 dB point DC 200 Hz Filter cut off switchable ranges 5 200 Hz Output ripple 200Hz filter 1kHz excitation 0 3 FSD Output ripple 50Hz filter 1kHz excitation 0 05 FSD Zero temperature coefficient S 2 4 UV C Span temperature coefficient S 0 01 0 015 FSD C Linearity 0 05 0 1 FSD Gain stability 15t 1000 hours 0 2 0 4 FSD Gain stability 29d 1000 hours 0 1 0 2 FSD 90 day offset stability 6 10 uV Ou2. LVDT A amp LVDT D Amplifier Signal Conditioner User Manual mantracourt com M mantracourt LVDT A amp LVDT D Manual Contents Chapter 1 The LVDT Conditioner s isccscsciccssccecstsssacasiescsecstsaeacastsanceaeecawscavisanceteeseesedeeaccedeesecsdasdeanssae 1 Chapter 2 Installing the LVDT A amp LVDT D csscsscsccccccscescesccscescescesesceseesesssssssessescescescessessessesees 2 Terminal COMNECHON ii ha A ENN ENS 3 Dimensions of the Enclosure and Mounting Holes ssssseeesssssseecosssssesecossssssccosssssecccossssscecossssseceoessssee 3 Output COMMEGUIONS as 4 Output Current Mode Settings Jumpers JP1 amp JP2 eee cee sese 5 Chapter 4 Input Calibration ce asen Saa Sa csi nado sen lens ee beses Ge Kra becas oe iento bas Xe 6 Spahi Sain SWT 0 ORF ABONA A Ai 6 Zero A a os 7 Excitation Amplitude SW278 seve ve 997 nels ule wie A A T SNN NNN T R NNN AAA AA AAA 7 The EVDIZA EVDT Di Filter ici cta ada db cea E neat ies dde 7 Filter C t off SW3 0 0EF To Oli A a siii 7 Chapter 5 Specification for LVDT A LVDT D esse sese eenn ennenen eee 8 WARRANTS a ee 10 Chapter 1 The LVDT Conditioner The LVDT provides a wide range of signal conditioning for LVDT transducers Offered in two versions the LVDT A for 110 240 V AC or 18 24 V DC operation and the LVDT D which is DC powered only Transducer sensitivities between 20 mV and 10 V are accommodated by a combination of DIL switch set
3. LVDT D input output signal and the power supply are made via 2 5mm field terminal blocks Cable entry in the cased versions is via glands in the side of the case LVDT PRIMARY SHIELD SCREEN 15V LVDT SECONDARY 3 Mantracourt Electronics Limited LVDT A LVDT D User Manual Chapter 3 Analogue Outputs Two analogue outputs are available from the LVDT DC current and DC voltage The ranges offered are as follows Output Range DC voltage 10 V NB Maximum Load on voltage ranges is 2 mA Bi polar input F S 5 V to F S 0 10V 0 5V DC current 0 20 mA NB Maximum impedance 500 R Uni polar input zero to F S 4 20m The analogue output options are summarised below NB Full scale output for the voltage ranges is achieved with a bi polar input Output Connections Connections Current Output Sink Current Output Source VOLTAGE OUTPUT lout lout LOAD S LOAD lout Vout ov In Sink mode the ve end of the load is connected to the internal 15V supply on the LVDT and the ve end is connected to the LVDT output The current through the load is sunk by the LVDT towards ground OV N B In this mode neither connection to the output load is electrically common to the load cell Select this option by fitting the two jumpers in the positions next to the span trimmer See Output Current Mode Settings Jumpers JP1 amp JP2 In Source mode the ve end of t
4. he load is connected to the LVDT output and the current is sourced by the LVDT output through the load towards ground OV This mode has the advantage that the negative output connection is common to the load cell Excitation terminal Select this option by fitting the two jumpers in the positions furthest from the span trimmer See Output Current Mode Settings Jumpers JP1 amp JP2 Mantracourt Electronics Limited LVDT A amp LVDT D User Manual Output Current Mode Settings Jumpers JP1 amp JP2 TERMINALS amp JUMPER POSITIONS i Jo maja o Ola Claim Sink mode Source mode Common ve Common ve Switch Settings 0 Off 1 0n x Don t care Analogue Output Options SW4 5 Mantracourt Electronics Limited LVDT A LVDT D User Manual Chapter 4 Input Calibration The LVDT A amp LVDT D provides the excitation and signal conditioning to cater for a wide range of LVDT transducers Select the analogue output range as detailed in Chapter 3 by means of SW4 Span gain SW1 0 OFF 1 ON Potentiometer P1 provides fine trimming and range overlap to enable the LVDT A amp LVDT D to be calibrated precisely to any given value within its ranges SW1 sensitivity settings shown in the table are for a Full Scale Output e g 0 10volts The LVDT A amp LVDT D can be calibrated with the transducer connected provided that two calibration points can be implemented e g by applying kn
5. icient enough to ensure a low impedance in order to attenuate RF interference Supplier Description UK Farnell 148 539 Individually shielded twisted multipair cable 7 0 25mm 2 pair Tinned copper drain Individually shielded in polyester tape Diameter 4 19 mm Impedance 54 Ohms Capacitance m core to core 115 pF amp core to shield 203 pF UK Farnell 585 646 Individually shielded twisted multipair cable 7 0 25mm 3 pair Tinned copper drain Individually shielded in polyester tape Diameter 6 86 mm Impedance 62 Ohms Capacitance m core to core 98 pF amp core to shield 180 pF RS 367 533 Braided shielded twisted multipair cable 7 0 2mm 1 pair Miniature twin round Diameter 4 8 mm Impedance 62 Ohms Capacitance m core to core 120 pF amp core to shield 210 pF Mantracourt Electronics Limited LVDT A amp LVDT D User Manual UNPACKING Carefully remove the LVDT unit from its packing Check that the unit is complete and undamaged The LVDT A amp LVDT D units can operated in any industrial environment providing the following limits are not exceeded Operating 10 C to 50 C temperature Humidity 95 non condensing Storage temperature 20 C to 70 C Two power supply options are available LVDT A 220 230 VAC 50 60 Hz 110 120 VAC 50 60 Hz 5 W Max LVDT A amp LVDT D 18 24 V DC 5 W approx 150 mA fully loaded Terminal Connection On the surface mounted versions connections to the LVDT A amp
6. ourt Electronics Limited LVDT A amp LVDT D User Manual 6 Zero offset SW2 SW2 1 2 3 4 5 6 7 8 Offset ve ve 20 10 5 x X X Note SW2 1 amp 2 Should not both be on Use switches 3 5 in conjunction with the polarity switches 1 and 2 to get as close as possible to the required offset value Use the fine control P2 to achieve the final setting If more than one switch is on at a time then the output of each is summed to give an overall offset to the output which can be up to 35 of full value This offset adjustment can be used either to compensate for the transducer offset error or to introduce a shift into the output s working range Excitation Amplitude SW2 8 Normally off Switching SW2 8 on reduces the excitation by a factor of two This allows lower impedance transducers to be used without overloading the electronics Please note that it may be necessary to alter the setting of the Span switch SW1 to compensate for the resulting lower input signal The LVDT A amp LVDT D Filter The LVDT A amp LVDT D incorporates a second order low pass filter which can be switched in to improve performance in electrically noisy environments It can also be used to reduce the effects of high frequency fluctuations in the displacement The cut off frequency of the filter is set by the 8 way DIL switch SW3 as shown in the following table Filter Cut off SW3 0 OFF 1 ON Sw 1 2 B 4 15 6 7 8 ul T N il Ml i
7. own displacements Actual calibration is carried out in the following way 1 Set the correct switch settings on SW1 using the transducer s calibration sheet supplied by the manufacturer see table Chapter 4 Page 1 This is normally specified as sensitivity or full range output and should be in mV or Volts 2 Apply the known low calibration displacement this may be zero if required and note the analogue output having ensured that the SW1 settings are correct for the transducer sensitivity as 1 3 Apply the known high calibration displacement and note the analogue output For optimum accuracy this should be at least 80 of full scale 4 Use the fine trim control P1 to obtain the required change in volts or mA between the two calibration points e g e Required output at low calibration point OV e Required output at high calibration point 7 5 V i e e A difference of 7 5 volts is required between the calibration points If the actual reading at the low calibration point is say 0 5 Volts then trim the high point to 8 0 volts to achieve a difference of 7 5 volts Note It may be necessary to repeat these steps until the required change in output is achieved 5 Use the fine offset control P2 in conjunction with the coarse switches SW2 3 5 to set the output to the required absolute values Each switch within SW2 offsets the output by a particular amount shown as a of full scale in the following table Mantrac
8. repair or unauthorised modification No other warranties are expressed or implied Mantracourt specifically disclaims any implied warranties of merchantability or fitness for a specific purpose The remedies outlined above are the buyer s only remedies Mantracourt will not be liable for direct indirect special incidental or consequential damages whether based on the contract tort or other legal theory Any corrective maintenance required after the warranty period should be performed by Mantracourt approved personnel only N A RN ISO 9001 Designed manufactured Penas gt EGISTERED y and supported in the UK REGISTERED FIRM In the interests of continued product development Mantracourt Electronics Limited reserves the right to alter product specifications without prior notice Code No 517 152 Issue 1 9 26 08 14 Mantracourt Electronics Limited LVDT A LVDT D User Manual 10
9. tings and a fine trim potentiometer Similar arrangements are provided for any zero errors in the transducers and can be used to offset the readings by up to 35 of full scale A wide frequency response is offered of typically DC to 200 Hz There is an on board low pass filter which can be switched in to reduce high frequency fluctuations or induced electrical noise to give stable readings under adverse conditions A wide range of output options for current and uni polar or bi polar voltage can be configured by DIL switch settings Both the AC and DC versions are based on a common board and are mounted in a light grey ABS case sealed to IP65 standard 1 Mantracourt Electronics Limited LVDT A LVDT D User Manual Chapter 2 Installing the LVDT A amp LVDT D In order to maintain compliance with the EMC Directive 2004 108 EC the following installation recommendations should be followed Inputs Use individually screened twisted multipair cable e g FE 585 646 The pairs should be pins 1 6 pins 2 5 pins 3 amp 4 Terminate all screens at pin 1 of the input The screens should not be connected at the transducer end of the cables Analogue Use screened twisted pair cable e g RS 626 4761 Output Terminate screen at pin 1 of the input The screen should not be connected at the host port Pin 1 of the input should be connected to a good Earth The Earth connection should have a cross sectional area suff
10. tput load stability gain 0 100 lt 0 01 FSD Output load stability offset 0 100 lt 3 0 01 FSD Power supply rejection gain 0 100 0 05 FSD Power supply rejection offset 0 100 0 05 FSD Operating temperature range 0 50 C Storage temperature range 20 70 C Humidity z S 95 Noise 1kHz 20Hz filter dc powered 3 7 mV p p Output options 10 V 5 V 0 10 V 0 5 V 0 20 mA 4 20 mA Connections Field screw terminals 2 5mm rising clamp Enclosure ABS case 160 x 80 x 55 mm sealed to IP65 fitted with 3 off cable glands Controls Gain pot Offset pot Coarse gain switches Coarse offset switches Filter cut off switches Output mode switch CE Approvals European EMC Directive 2004 108 EC BS EN 61326 1 2006 BS EN 61326 2 3 2006 Low Voltage Directive 2006 95 EC BS EN 61010 1 2001 Rated for Basic Insulation Normal Condition Pollution Degree 2 Permanently Connected Insulation Category Ill Mantracourt Electronics Limited LVDT A amp LVDT D User Manual LVDT A amp LVDT D Connection details DC PSU LVDT A or LVDT D Voltage output 2mA max AC mains input LVDT A only Sink mode current output 500 Ohms max N B not common to PSU negative or strain gauge shield i e e Output Analogue output Sw4 L LILLIE 15 Exc frea 61718 Source mode current output OOOO A sll Ta 500 Ohms max N B common S 10V DIS SHH m KAA negative amp strain ga
11. uge shie 05V 33902 5 LLL d 120V 10 A 2 O n LI O OFF A E o ois ES sai ba L e sw3_ 1 2 314 5 6 7 8 ETE Span gain I5Hz_lolofolo 1 1 x x E 3 lo lol 1Po of 4 ol a a LEES P2Zer0 zero oftset Sw2 K Z gt k 3 35 3 ANDA ldla I Please refer to manual B p i i sw2 1 2 3 4 s e 7 8 o04z1111111110 01x x for intermediate settings n T 20 10 5 x x x HSR LVDT Transducer 9 Mantracourt Electronics Limited LVDT A LVDT D User Manual WARRANTY All LVDT products from Mantracourt Electronics Ltd Mantracourt are warranted against defective material and workmanship for a period of 3 three years from the date of dispatch If the Mantracourt product you purchase appears to have a defect in material or workmanship or fails during normal use within the period please contact your Distributor who will assist you in resolving the problem If it is necessary to return the product to Mantracourt please include a note stating name company address phone number and a detailed description of the problem Also please indicate if it is a warranty repair The sender is responsible for shipping charges freight insurance and proper packaging to prevent breakage in transit Mantracourt warranty does not apply to defects resulting from action of the buyer such as mishandling improper interfacing operation outside of design limits improper
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