Home

Manual - Pyramid Technical Consultants

1. 20 9L MOUNTING wal eiie aote gne te id aurea eii eia e ees 20 92 Grounding and power Supply edi epe Rea 21 SN 8 IATA AAA AAA ON 21 93L Typical SUPL ita 21 H20 User Manual H20 UM 140911 Page 2 of 75 PSI System Controls and Diagnostics 10 Getting Started using the Pyramid Diagnostic Host Programs eee eee ee senten entes n tenens tnsnnana 24 10 1 Preparing the H20 and MFP 30 for operation esee nennen nene nennen nennen rennen 24 10 2 Installing and using the PTC DiagnosticG2 Program esee ener 24 10 2 1 Establishing communication with the H20 essere eene nemen 27 10 3 S reen Layouts Top b nher a sec t e OPEN RD e e AT aceon 29 10 4 Screen layout Message Log area esses enne enne eene nenne 30 10 5 Screen layout Right hand tabs eese eene nenne trennen nennen nennen teens 30 10 5 1 Dat ttab nia Rea iD eaae dr ote illo tou cicius 30 10 5 2 susc M 32 10 5 3 Calibration t b it ebbe ge ap aded 33 10 5 4 Field Control Parameters tab e artnet theta eei Ee e HR e Perder enn 35 10 5 5 Properties tab RO egeo e ld cete e e 35 10 6 Screen layout Graphics area eese nee nnennennenee tete enn enne nee nnnnnn 36 10 6 1 Strip displ Y d 37 10 6 2 Scope di
2. 4X 3 66 4 2 a 114 0 MOUNTING SLOT i i Al Jun n 4 1d i 80 5 77 5 a 62 0 A Da 4 eM Ji UMP 2 0 122 6 104 6 0 90 t L i 122 3 Figure 2 H20 control unit plan and side views Dimensions mm H20 User Manual H20 UM 140911 Page 18 of 75 PSI System Controls and Diagnostics CENTER HLN 310 3 XP 1B Figure 3 MFP 30 probe geometry Dimensions mm H20 User Manual H20 UM 140911 Page 19 of 75 PSI System Controls and Diagnostics 9 Installation 9 1 Mounting The probe should be mounted so that the sensitive spot is located in the field you want to measure Two clear holes suitable for M4 screws are provided on the probe mounting flange The MFP 30 probe will measure the field component normal to the flat and will show a positive value for a field vector entering on the center of the bullseye pattern Figure 4 Probe orientation for a positive field reading MFP 30 probe ve gain coefficient The mounting should prevent any tendency for movement or vibration especially if the probe is measuring a fringe field where there is field curvature If the field has significant AC components the mounting should be non conducting to avoid measurement errors due to eddy currents The H20 control unit
3. r T T T T T T T 20 0 20 40 60 80 100 120 140 160 Current control Field contol Kp 8 5e 6 Figure 39 Response to setpoint steps under current control and field control H20 User Manual H20 UM 140911 Page 55 of 75 PSI System Controls and Diagnostics 16 2 Field servo algorithm The H20 algorithm is a simple proportional controller which runs at the same rate as the averaging period Enhanced controllers to suit particular applications will be added in future software updates The field setpoint can be provided as a value in Gauss over the communication channel from the host computer Digital Closed Loop mode or as an analog voltage Analog Closed Loop mode The action is easy to understand using the PID graphics screens from the PTC Diagnostic G2 program In the example the H20 is using Analog Closed Loop mode Genera PDA PDB y Initiate Stop Analog Setpoint V Setup H20 Setpoint gain G V Setpoint G Field G Buffer Contiguous Data 4000 0000 Buffer Size 2000 Digital Setpoint G FERENT Type Control min max V max v Mode Analog Closed Loop Y 2 0000 Probe B Slew limit v s Serial Number 11 1 0000 Type Control V Kp W G Mode Digital Closed Loop Y 3 0000e 7 Save And Recall Save Settings Recall Settings Settings Saved Q MFP 30 1 800 1 600 1 400 1 200 1 000 800 600 Fiel
4. PSI System Controls and Diagnostics 12 Magnetic Measurements 12 1 Measures of Magnetic Field Strength Hall probes measure the magnetic flux density also called magnetic induction but it is useful to see how this is related to other measures of the magnetic field There is a field around a current carrying conductor or a permanent magnet that exerts a force on other current carrying conductors moving charged particles and compass needles The force is proportional to a measure of the field called the magnetic flux density This is measured in tesla T or kg m s 2 A 1 m 1 kg s 2 A 1 in SI base units One tesla is a high field by everyday standards and is typical of the field in the air gap of a particle beamline bending dipole electromagnet The old cgs unit is the Gauss and this is still widely used 1 T 10e4 Gauss 1 T 10 kGauss The Earth s magnetic field is around 0 5 Gauss at the surface of the Earth varying with location from about 0 25 to 0 65 Gauss It is common to describe the resistance of an energetic charged particle to being deflected by a magnetic field by its magnetic rigidity measured in tesla meters Tm A one Tm beam in a one T dipole field will bend with a radius of one m An example of a one Tm beam would be 46 75 MeV protons The magnetic flux which gives rise to the magnetic flux density is measured in Webers I T21 Wb m 2 The old cgs unit of magnetic flux is the maxwell but this is rar
5. Zero save the buffered data you will have the opportunity to save the raw values or the zero offset corrected values Clear buffered data Values are cleared from the PSI Diagnostic data buffer but any acquisition in progress continues and timestamps are not reset td Save data buffer contents to csv file 10 6 1 Strip display Data from the selected channels with the selected averaging is plotted onto a rolling strip chart as itis acquired The model for the display is a chart recorder The horizontal axis is a timestamp the vertical y axis is the field in Gauss 15 UUU 10 000 g a um uw 5 000 0 21 255 21 260 21 265 Time seconds 4 p Y 50 y a Ino Avg v H5 zero 3 strip X Scope X Histogram J 47920 Samples d El Figure 24 Strip chart display You can place a cursor on the plot by clicking near one of the traces When the data you have acquired exceeds the horizontal axis capacity a scroll bar appears below the graphic This allows you to move backwards and forwards in the data that has been buffered by the PTC DiagnosticG2 You can do this while the acquisition is taking place and after it has completed H20 User Manual H20 UM 140911 Page 37 of 75 PSI System Controls and Diagnostics 10 6 2 Scope display Data is plotted onto the display after every 256 readings Otherwise the display is identical to the Strip plot This mode is most useful when using buf
6. 53 15 2 We E E 53 15 3 Fast MonitoVmmode aso RR RENE e REOR HINTEN EI 53 n 54 16 1 Benefits of field control ce a es i ee i e RU eee ete e 54 16 2 Eield seFvo AMlgOFithhiiiu aet WE ia tatu te ERE eet 56 16 3 Tur ne the control 100p ne tte ti n 57 On 59 17 1 H20 control unit front panel connectors esee esee ener enn etes nnn ennt en nne e tense nennen 59 17 1 1 Probe connections eh orc ette eie de teri t e ie e ete eene re eget 59 17 1 2 Analog signals Eo ERES GE EEUU END 60 17 2 R ar panel COnnectoYs iia idad Ioannes ide 60 17 2 1 Powerqnput i uu cocer A A estate ere 60 17 2 2 Fiber optic communications isie sneinen nennen EEEE enn n enano nano erret etre 60 EMOODUPTnr 61 18 1 Erontipanel controls A a E E tas EY INEO QU ER EGET Ge TER Ie ERE QE TER R ER d 61 18 2 Rear panel Controls ai ai 61 18 2 1 Address SWitch teet perte eterne er qe repe ques 61 18 3 ErontipanelindicdlOrg eta tee tet QR RN RSS 61 18 4 Rear panel indicators naonnana A ers nee ER d e t bea 61 18 4 1 jc n 61 18 4 2 ACUIVILY o tete TREE n metre e eb edet o rb ec e ire od e fife ee d e 61 18 4 3 NEtWOTK i ete t d ette tiet e t ettet a E eet oett 61 18 4 4 Device zie be EIER NUR DUE
7. Probe and H20 control unit are not a matched pair Check serial numbers against shipping documentation Use matched pairs Return to Pyramid Technical Consultants Inc for recalibration if necessary No probe connected Temperature reading is unrealistic gt 100C Connect a probe Unstable field reading Field is actually changing Check field by independent means Probe position is unstable in a Check field by independent Provide a mechanically stable H20 User Manual H20 UM 140911 Page 66 of 75 PSI System Controls and Diagnostics spatially varying field means or by placing the MFP in a known stable field probe mounting High noise levels Integration time too short for signal being measured Noise level reduces with integration period Use an appropriate integration time for the signal level H20 case not grounded Check continuity to local ground Make dedicated ground connection if mounting does not provide this Field has unsuspected AC components Check field by independent means or by placing the MFP in a known stable field Line voltage pickup Noise level drops sharply if averaging period is 16 7 msec 60 Hz 20 msec 50 Hz or 100 msec 50 or 60 Hz Keep H20 and signal cable clear of unscreened high current mains voltage If possible use integration periods N line frequency Analog signals re
8. The H20 system is intended for magnetic field measurement particularly in electromagnets The field can be monitored at rates sufficient for real time monitoring and for field control and the probe design eliminates magnetic materials or conducting surfaces that would distort the measurement of AC fields The MFP 30 probe is particularly suited to measure the magnetic fields typical of ion beamlines which use conventional non superconducting electromagnets and has the range and precision to perform well in many general field measurement applications The probe is thin less than 2 5 mm but nevertheless stiff enough to allow it to be placed at a known and stable location in the field The H20 has design features which make it tolerant of electrically noisy environments but the place of use is otherwise assumed to be clean and sheltered for example a laboratory or light industrial environment The unit is typically integrated into a larger system using fiber optic communication links It can be operated independently if combined with a suitable fiber optic loop controller and host computer Users are assumed to be experienced in the general use of precision electronic circuits for sensitive measurements and to be aware of the dangers that can arise in high voltage circuits 7 2 Key Features Two channel magnetic field measurement Probes designed to measure correctly in AC fields High performance HE244 Hall effect device MFP 30 Probe t
9. H20 MFP 30 Precision Magnetic Probe System User Manual Pyramid Technical Consultants Inc 1050 Waltham Street Suite 200 Lexington MA 02421 USA US TEL 781 402 1700 e FAX 781 402 1750 EMAIL SUPPORTOPTCUSA COM Europe TEL 44 1273 493590 PSI System Controls and Diagnostics 1 Contents 1 jUU 2 2 Table of gru er 6 3 eria ur e X 8 4 a dnce 10 4L Componehts i a n pr ipie D amo e d eit 10 42 Pre configured system examples e Rep a a 10 5 Scope Of IA ERN 11 6 Mirum 12 DD MEE ITTAERTIDHIT MEER 12 6 2 Data cables sss T n DERE RS A REGERE IA RE be 12 REMO omi 12 04 DIN TAL OUT ri woes eS 12 0 5 Magnetic shields e ie et Fa teres cca cea Secs eds eee a a hd tase ca E ae e tutu e edel 12 7 Intended Use and Key Features eere e ee ee eee eee eee eene teneas tns tn seins tss ense tassa seen seen stesso se tosta seen sensns 13 ZL Intended Usec HC E 13 FD Key Features innan ER E NOA 13 8 SPCCHICATION Ne HY 14 9 jUrn
10. Activity Power 18 4 4 Power Green LED On input power is present internal DC DC converters are running 18 4 2 Activity Green LED Flashes for 100 msec when H20 has received digital output setting such as gain change 18 4 3 Network Green LED Flashes when H20 is processing messages on the fiber optic channel 18 4 4 Device Green LED Flashes on for 100 msec with period 250 msec averaging time when H20 is initiated and acquiring data H20 User Manual H20 UM 140911 Page 61 of 75 PSI System Controls and Diagnostics 18 5 Internal settings We do not recommend that you open the H20 case unless specifically instructed to do so by your supplier or Pyramid Technical Consultants Inc There are no user serviceable parts inside 18 5 1 JPR1 settings Internal jumper JPR1 is reserved for future configuration settings Links Function 1 Reserved 2 Reserved H20 User Manual H20 UM 140911 Page 62 of 75 PSI System Controls and Diagnostics 19 Software updates The H20 has three embedded firmware releases Firmware Function FPGA fhex file General logic loop message passthrough ADC reading and averaging PIC Boot hex file Boot up code upload PIC Application hex file Main application calibration range control host communications SCPI instrument model The PIC boot code is unlikely to require updating It requires use of an Alter
11. CA network protocol CA is specially designed for the kind of high bandwidth soft real time networking applications that EPICS is used for and is one reason why it can be used to build a control system comprising hundreds of computers Pyramid supplies an executable called IG2 which embeds an open source Channel Access Server from the EPICS community This allows connection via the Ethernet interface IG2 is configured for the devices you wish to connect using editable xml files Once IG2 is running on a computer in your network then any other computer can run a client program which can display and control the process variables for the devices In the simple network in figure 27 the process variables of an H20 attached to an A360 via fiber optics are exposed to the network by the IG2 service running on a server computer One or more client GUI computers can then access the values oor cor Sees Sees Switch EE IG2 server GUI PC aem Figure 27 Example network for EPICS communications H20 User Manual H20 UM 140911 Page 40 of 75 PSI System Controls and Diagnostics There is a wide range of client interfaces from the EPICS community including interfaces for C C Java Python Labview and Matlab TM The Control System Studio or CS Studio http controlsystemstudio github 10 is a set of ready made tools built on Java a
12. Comp 2 0 000001000 Probe B Comp 0 0 000000000 Comp 1 0 000125000 Comp 2 0 000001000 Temperature Compensation dT PresentTemp CalTemp Figure 21 Temp calibration sub tab H20 User Manual H20 UM 140911 Page 34 of 75 PSI System Controls and Diagnostics Enable Temp Set whether temperature compensation is used The default setting is Compensation checked Probe A B The offset Comp0 ar and gain Compl again1 Comp2 again2 terms of the probe temperature compensation 10 5 4 Field Control Parameters tab The inputs fields on this tab are enabled if your H20 system has the S2 field control option installed The fields are also presented on the PID A B graphic screens See section 16 for more details on field control Probe A Magnet Control Proportional Kp 1 000e 05 Out Max V 2 0000 Positive Only Output v Slew Limit V s 0 5000 Setpoint Gain G V 4 0000e 03 Figure 22 Field Control Parameters tab Proportional Kp The proportional term that determines how responsive the control loop is Out Max V The maximum absolute value of analog output voltage the control voltage for the electromagnet power supply that can be sent out Positive Only Output Check if the magnet system is unipolar only The control voltage output range is limited 0 V to Out Max V no negative control voltages Slew Limit V s The maximu
13. E Figure 11 PTC DiagnosticG2 device discovery In this example we discover the A360 and a recovery utility that can be ignored H20 User Manual H20 UM 140911 Page 27 of 75 PSI System Controls and Diagnostics n 3 PTC Diagnostic Discover Devices A Bramo Address Name Owner 192168168 2360 1 I les AGO Recovery 0 Discover Controllers J 192 168 100 20 dr Add IP Address H Load System File 54 Connect amp Discover Subdevices Camel Figure 12 PTC DiagnosticG2 device discovery discovered loop controllers Now highlight the A360 and click Connect amp Discover Subdevices After a few seconds the program should find the H20 plus any other devices you may have connected and show the connection tree in the system pane In this example there is an H20 and an M10 device on loop 1 of the A360 On the H20 control unit itself you should see the network LED illuminate regularly to show that loop messages are being processed System 4 loop 1 le H20_2 fs M10 3 loop 2 f AGO Recovery Figure 13 Discovered devices Double click the H20 entry in the list to open the H20 window You will see a message in the message area at the bottom showing that the H20 described as a PTCboard has been connected You will see the field reading from connected MFP 30 probes If you have a permanent magnet to hand you can place it near a pro
14. Figure 34 H20 control unit end panels tette Ite e e dees Fee e t pes eaa tinet 17 H20 control unit plan and side views Dimensions mm sse nennen 18 MFP 30 probe geometry Dimensions mm sess rennen nennen nennen nennen enne 19 Probe orientation for a positive field reading MFP 30 probe ve gain coefficient 20 Schematic example H20 setup 5 2 erret vet arte ee Y suas HER re Bet Ue esee E e seudevass td eren 22 Schematic example setup for electromagnet field control esee 22 Schematic example setup for electromagnet field control with independent field programming 23 Example of a direct connection to the H20 via an A360 and Ethernet see 25 Setting up a Windows PC with a static IP address essere enne 26 Pinging the loop controller urit ete ge eo dtes 26 PTC DiagnosticG2 device discovery ener rennen nennen nenne nnne 27 PTC DiagnosticG2 device discovery discovered loop controllers se 28 DiscovereddeviCES 28 H20 connected and reading magnetic field sess eene nennen eren 29 Top banner display inculto rita lenta oen aeter Pu Pet Pia eadein etl ehe eer dui 29 Message drea iii A deo A dee un 30 AI A 31 H20 setup tab remove Reano e im i edente 32 EDO calibration Sub tab 5 ita 33 Probe
15. 1600 44 8 x40 625 Gauss All analog inputs are filtered by 4 pole low pass filters with 10 kHz roll off 3 dB The filter passband can be altered to special order at build time A fully parallel 250 kSa sec 16 bit bipolar ADC reads all the analog inputs Any ADC over ranges are flagged and communicated to the host computer along with the digital input bit pattern H20 User Manual H20 UM 140911 Page 48 of 75 PSI System Controls and Diagnostics Incoming 24V power is fused polarity protected and filtered It is used to supply isolation DC DC converters which create the internal voltage rails and provide 12 VDC for the probes H20 User Manual H20 UM 140911 Page 49 of 75 PSI System Controls and Diagnostics 14 Calibration 14 1 Overview The calibration scheme assumes you may need to swap probes between H20 channels or H20 units Therefore there are separate calibration settings for the H20 which ensure it is an accurate voltage measurement device and for the probe which ensures it is an accurate field to voltage conversion device The probe serial number is stored along with the calibration parameters to allow you to keep the correct probe and calibration together We recommend that you keep an independent record of the calibration values in case the sotred values are accidentally overwritten 14 2 H20 calibration The H20 is calibrated in the factory using a precision traceable v
16. Buffering v Buffer Contiguous Data Buffer Size 65535 Checking the Buffer Contiguous Data box sets up a data buffer in G2 loop controllers that support the function This allows you so acquire time contiguous data at rates that exceed the capacity of the communication channels The maximum available buffer size is 65535 readings Serial number You can assign and store the serial number of probe A and B which will be associated with the calibration values Type Select probe type The H20 only supports the MFP 30 probe at the time of writing Mode Select the function of the analog inputs and outputs The closed loop field control modes are only available if you have the S2 option ioris AR installed Analog Closed Loop Fast Monitor Mode See section 14 for more details on the mode selections Pressing the Save Settings button copies all current acquisition settings probe serial numbers calibration values and field servo settings S2 option only into non volatile memory The Recall Settings button recovers the values from NVR and makes them the working settings The green LED turns on to show when the saved settings and the current working settings are the same 10 5 3 Calibration tab The Calibration tab provides access to the H20 and probe calibration settings There are three sub tabs covering the H20 settings the probe settings and the temperature compensation settings All the values are d
17. and the averaging should be high 0 1 seconds for best signal to noise ratio The reading with the probe shielded should be less H20 User Manual H20 UM 140911 Page 50 of 75 PSI System Controls and Diagnostics than 0 1 Gauss on x1 and x4 ranges If it is not and you wish to adjust it then alter the offset parameter for the relevant MFP 30 probe and relevant gain setting until the reading is close to zero The probe temperature should be close to that used for the factory calibration to avoid temperature compensation errors Figure 34 MFP 30 probe in CAL MFPBO0 shield 14 4 Temperature Coefficients Hall probes work due to migration of electrons in a bulk semiconductor and thus the signal for a given field depends on the mobility of these electrons which in turn depends upon temperature The MFP 30 probe includes a separate temperature sensor in close thermal proximity to the Hall device and the compensation is carried out in real time using coefficients stored by the H20 control unit There are two components to the temperature compensation a zero field offset coefficient and a gain correction The gain correction provides a first and second order term A reference temperature is recorded as part of the factory calibration The factory calibration is linked to the serial number of the probe You should be sure that the probe you have connected matches the serial number shown on the Setup tab The green LED on the Setup tab
18. any servo loop you need to find a good compromise between stability and speed The faster the servo responds the more likely it is to become unstable and oscillate in some circumstances The speed that the servo can respond will depend strongly on the characteristics of the magnet such as inductance and eddy current decay and the bandwidth and voltage compliance of the power supply In the case of a standard unipolar single quadrant power supply the response can be different for increasing and decreasing current Fortunately it is relatively simple to tune the H20 servo loop The objective is to ensure that the loop is unconditionally stable and that the system achieves a new setpoint in acceptable time Set the voltage Slew Limit so that the power supply will stay within its voltage compliance limit when driving the magnet load The maximum rate of change of current due to the Slew Limit is dl dtmax Slew Limit PSU conversion gain in A V 1 The maximum voltage required to achieve this rate of change of current is in the absence of severe magnet yoke saturation V L dI dtmax Imax R where L and R are the inductance and resistance of the magnet load and Imax is the maximum current delivered You should reduce the Slew Limit and therefore dI dtmax so that V will not exceed the power supply voltage compliance limit In addition set the Control min max if you wish to limit the maximum control voltage that the H20 servo controller can s
19. as specified in your order The field control option is an additional option MFP 30 probes as specified in your order Interconnecting signal cables as specified in your order USB memory stick containing User manual PTC Diagnostic software installation file PSI DiagnosticG2 software installation file Power supply Optional items as specified in your order OEM customers may not receive all the items listed H20 User Manual H20 UM 140911 Page 11 of 75 PSI System Controls and Diagnostics 6 Optional Items 6 1 Power supplies PSU24 40 1 424 VDC 1 6 A PSU 100 250 VAC 50 60 Hz IEC C14 3 pin plug receptacle with output lead terminated in 2 1mm threaded jack 6 2 Data cables CAB ST P x ST Fiber optic cable 1 mm plastic ST terminated x feet long CAB ST HCS x ST Fiber optic cable 200 um silica ST terminated x feet long 6 3 Fiber optic loop A360 fiber optic loop controller Ethernet adaptor A500 intelligent real time controller with Ethernet interface A560 intelligent real time controller with Ethernet interface 6 4 DIN rail mount MTG DIN35 11462 Mounting adaptor for 35mm standard DIN rail H20 control unit can be mounted along or across the rail 6 5 Magnetic shield CAL MFPBO Double mu metal shield for probe zero offset checking and calibration H20 User Manual H20 UM 140911 Page 12 of 75 PSI System Controls and Diagnostics 7 Intended Use and Key Features 7 1 Intended Use
20. calibration sub tab 5 uiuo aia 34 Temp calibration sub tab tet Re HD UR Ee e RITE ainia eH do rbd pese ign 34 Field Control Parameters tab 2 eoe e REOR RO e o dtes 35 Properties tab iat edente dtr tese e th e e be tesa dni rides 36 Strip chart displ y 5 eee tee ue e made oie tie aeu 37 Histogram display E M 38 H20 connection to the PSI Diagnostic via an A500 loop controller esee 39 Example network for EPICS communications essere nennen nenne nennen nne 40 Example user screen created using CS Studio BOY ssssssssseseeeeeeenren rene nene 41 Example xml system configuration file for EPICS sssssssesseeeeeeeeeenen nennen 43 Direction convention for magnetic field lines sees eren enne nennen nne 45 Direction convention for magnetic field lines essent 45 MEFP 30 probe block scbematie eni oe ome e ia teo aedi tie ee 47 H20 control unit block schematic channel A shown ooooccconococcnononanononononononnncnonnnnnonononononnnnncnnnnnnncnnnnnnono 48 MEFP 30 probe in CAL MFEPBO shield ertet repete D ot tente eto e bo eina 51 H20 User Manual H20 UM 140911 Page 6 of 75 PSI System Controls and Diagnostics Figure 35 Figure 36 Figure 37 Figure 38 Figure 39 Figure 40 Figure 41 Figure 42 Figure 43 Figure 44 Figure 45 Figure 46 Figure 47 Typical MFP 30
21. field despite the hysteresis The H20 system with the S2 option provides this capability Example setups for current programming and field programming of an electromagnet are shown in the following figures In the first figure a series of current steps is programmed by a function generator The H20 simply measures the resulting field steps An MIO is also shown that interfaces the power supply it could also provide the current program if required Bmon Diag dis P uc Function gen Vprog compliance Imon Diag Vmon Diag Figure 37 Example setup for current control In the second figure the function generator voltage steps are used as field program steps with the field values given by Bprog Setpoint Gain The H20 compares the actual measured field with the target field and adjusts the current demand Iprog to drive the difference to zero H20 User Manual H20 UM 140911 Page 54 of 75 PSI System Controls and Diagnostics Bmon Diag Function gen Vprog compliance Imon Diag Vmon Diag Figure 38 Example setup for field control Th difference between the two methods is illustrated below The fields with increasing current steps are clearly different from the fields at the same current setting when descending due to magnet steel hysteresis Under field control there is some initial overshoot at each step but the fields are identical on the way up and the way down
22. if you have the field control option run an independent field control servo on each A typical application is the control of a two dimensional magnetic beam scanning system such as those used in particle therapy beamlines and semiconductor ion implanters H20 User Manual H20 UM 140911 Page 23 of 75 PSI System Controls and Diagnostics 10 Getting Started using the Pyramid Diagnostic Host Programs Usually you will use a custom application to communicate with the H20 either one you write yourself using the software interfaces available from Pyramid Technical Consultants Inc or one that is supplied by Pyramid However you can get started immediately using one of the Pyramid Diagnostic host programs These are available for free download from www ptcusa com and are provided with the H20 for end user customers There are two generations of the Diagnostic software and the H20 is a G1 device that is compatible with both PSI Diagnostic This software supports all Pyramid products apart from G2 devices It allows you to connect the H20 via an A500 controller Ethernet communications use UDP with an added reliability layer PTC DiagnosticG2 This software supports all G2 devices such as the A560 1128 and C400 plus a growing selection of other Pyramid devices including the H20 It allows you to connect the H20 via an A360 A500 or A560 controller or other Pyramid G2 products such as the 1128 F460 and C400 that support fiber op
23. must be mounted within cable reach of the MFP probe Three standard cable lengths are available 9 foot 15 foot and 22 foot with the shorter cable preferred for best noise performance Longer cables can be supplied on request The control unit may be mounted in any orientation or may be simply placed on a level surface Four MG clear holes are provided in the base flange on a 62 mm by 114 mm rectangular pattern see figure 2 A DIN rail adaptor is available for the H20 control unit The mounting positions for probe and control unit should allow sufficient access to connectors and cable bend radii Leave 60mm clearance at either end for mating connectors and cable radii H20 system includes temperature compensation but you will get maximum precision if the control unit and particularly the probe are in a temperature controlled environment No forced air cooling is required but free convection should be allowed around the case H20 User Manual H20 UM 140911 Page 20 of 75 PSI System Controls and Diagnostics 9 2 Grounding and power supply A secure connection should be made via the H20 control unit mounting flange to local ground potential If the unit is mounted on an insulating surface then one of the four mounting screws must be re assigned as a grounding connection 24 VDC power should be provided from a suitably rated power supply with the following minimum performance If you purchased your H20 as an end user a compatible
24. new code H20 User Manual H20 UM 140911 Page 64 of 75 PSI System Controls and Diagnostics Figure 46 Reboot prompt If the FPGA upload fails for any reason such as loss of power during the upload or data corruption then the H20 may not be able to communicate In the unlikely circumstance that this happens it can be recovered using an FPGA programming tool and the pof version of the FPGA code Contact your supplier or Pyramid Technical Consultants who will arrange for the unit to be repaired 19 2 PIC microcontroller firmware updates The PIC microcontroller application code may be updated periodically to add new operating features New code releases will be provided by your supplier or can be downloaded from the Pyramid Technical Consultants Inc website The hex file can be loaded using the PTC DiagnosticG2 host Update PIC Code button on the PTCDiagnosticG2 Properties tab and navigate to the relevant file The process takes about one minute and the new code will load and run automatically hy PTCE Server 81 133 144207 Remote Desktop Connection 09 dl UAE 1n 9 tnn a a8 E PTC Diagnostic 5 ere rg El BB Dover Y seop system 49 Start System Tie Windows 5 Initiate Al System 4 EA 192 168 168 23601 4 loop k H202 Seon ha M13 loop 2 mm 192 168 12 o ol n nnn n 92 Fe fee A60 Recove ware Open Hex Appl
25. of the PTC DiagnosticG2 illuminates when the probe serial number and calibration coefficients are saved or recalled as a matched set Measurements then use the difference AT between the measured temperature and the reference to correct the measured field Boor Bineas 1 B again FAT Again AT ao AT where Bmeas is the field reading before compensation againt and again2 are the first and second order gain coefficients and aor is the offset coefficient Figure 35 illustrates the effect of the aor parameter over a typical temperature range when measuring close to zero field Note that even before compensation the MFP 30 has a smaller temperature coefficient than a typical commercial Gaussmeter Figure 36 illustrates the effect of using again and again2 gain correction parameters for the measurement of a 3 kGauss fixed field over a typical operating temperature range H20 User Manual H20 UM 140911 Page 51 of 75 PSI System Controls and Diagnostics Measured field Gauss 1 00 Probe temperature C MFP 30 comp off MFP 30compon Typical Gaussmeter Figure 35 Typical MFP 30 temperature compensation zero offset 2960 2970 2980 Measured field G 2990 3000 T T T T 1 25 30 35 40 45 50 Probe temperature C MFP 30 comp off MFP 30compon Typical Gaussmeter Figure 36 Typical MFP 30 tem
26. power supply will have been provided Output voltage 24 0 5 VDC Output current 300 mA minimum 2000 mA maximum Ripple and noise 100 mV pk pk 1 Hz to 1 MHz Line regulation 240 mV The H20 is tolerant of line voltage in the range 22 VDC to 26 VDC although we recommend using a 24 V supply with reasonable accuracy as noted above The H20 includes an internal automatically re setting PTC fuse rated at 200 mA However the external supply should in no circumstances be rated higher than the H20 connector limit of 5 A and a maximum of 2 0 A is recommended 9 3 Connection to equipment 9 3 1 Typical setup Figure 5 shows a typical installation to monitor a magnetic field in schematic form An MFP 30 probe is measuring a field component normal to the flat face of the probe It is connected to the H20 control unit via the cable included with the H20 system Note that this cable can be connected either way round The H20 is on a fiber optic communication loop under control of one of the Pyramid Technical Consultants Inc loop controllers A360 A500 A560 The choice of controller depends on the overall system requirements any of them allows the full capability of the H20 and MFP 30 to be exploited Software on the host computer displays the field readings and controls provided by the H20 This may be the Pyramid diagnostic programs provided with the product or custom software that connects to the Pyramid devic
27. temperature compensation zero offset esses eene 52 Typical MFP 30 temperature compensation gain nennen rennen nne nenne 52 Example set p tor current control eedem A etm ele a ea 54 Example setup for field controlo ici pin bt 55 Response to setpoint steps under current control and field control sse 55 Field control graphic display e REESE e Eye ere eres 56 Step response at increasing Kp setting ionerne ea er cnc no nonnnonn non nono nono nano nn nn neen nemen eene 58 Step response detail at increasing Kp setting magnified field scale on right esesssss 58 H20 front panel signal connections snesena a a AE conan nn N EE E E 59 selecting the thex tile to load s iSt ER e are ees 64 FPGA Update 1n progressi eoe Re metet eism m HE A ei ees 64 Reboot prompt 5 e De eee ee ie Et cen ie mee ieu a eh hedera 65 selectins the hex fileto load i uui eher tt 65 H20 User Manual H20 UM 140911 Page 7 of 75 PSI System Controls and Diagnostics 3 Safety Information This unit is designed for compliance with harmonized electrical safety standard EN61010 1 2000 It must be used in accordance with its specifications and operating instructions Operators of the unit are expected to be qualified personnel who are aware of electrical safety issues The customer s Responsible Body as defined in the standard must ensure that operators are provided with the appropriate equipme
28. 0 User Manual H20 UM 140911 Page 26 of 75 PSI System Controls and Diagnostics 10 2 Installing and using the PTC DiagnosticG2 Program If you are an end user your H20 was shipped with a USB memory stick with the installation files you need We recommend that you copy the files into a directory on your host PC Check the Pyramid Technical Consultants Inc web site at www ptcusa com for the latest version The program runs under the Microsoft Windows operating system and has been tested on Windows XP Windows 7 and Windows 8 Install the PSI DiagnosticG2 by running the PTCDiagnosticSetup msi installer and following the screen prompts Once the program has installed you can run it at once It will allow you to connect to the H20 and depending upon your setup multiple additional devices at the same time 10 2 1 Establishing communication with the H20 We ll work through an example where the connection to the H20 is via an A360 at IP address 192 168 1 68 Start the PSI DiagnosticG2 the Discover Devices dialog will open Clicking the Discover Controllers button MM Discover Controlera will make the program search the accessible local area network through all active network interfaces for loop controller devices E 8 PTC Diagnostic Discover Devices Em Address Name Owner a Looking for Loop Controllers 16 elf Add IP Address Load System File Connect amp Discover Subdevices
29. 10 way EXG 1B 310 Probe body materials Glass reinforced polycarbonate FR4 fiberglass epoxy Weight 40 g 1 4 oz Dimensions see figure 3 Operating environment 0 to 35 C 15 to 25 C recommended to reduce drift and offset 8096 humidity non condensing vibration 0 2 g all axes 1 to 100 Hz Shipping and storage environment 10 to 50C 8096 humidity non condensing vibration 2 g all axes 1 to 100 Hz H20 control unit Analog inputs Number Six two field measurements two temperature measurements two general purpose inputs 10 V Field gain settings Gain settings x1 x10 these combine with x1 and x4 settings in the MFP 30 probe to give four field ranges Digitization 16 bit successive approximation over full range Sample rate 250 kSa s 1 Downsampling Selectable block averaging from 25 to 62500 conversions per reading Calibration Gain and offset values for each analog signal and each range stored in EEPROM Analog outputs Number Two 10V Used for field control if optional feature is in use Resolution 16 bit over 10V H20 User Manual H20 UM 140911 Page 15 of 75 PSI System Controls and Diagnostics Transition noise lt 25 mV typical at updates Communications Communications to loop controller Fiber optic 10 Mbit sec Data rate through to hos
30. AD16 0 10_140214 fhex 19 02 20141 FHE B E _ H20_FPGAD16 0 12_140425 fhex 5 04 2014 HEX F 8 3 Libraries H20 FPGAD16 0 15 140523 fhex 23 05 2014 21 55 HEXF a4 KB T Documents H20_FPGAD16 0 18 140624 hex 4 06 2014 20 29 HE B aj Music O H20 FPGAD16 0 19 140625 fhex 06 2014 17 16 HE E e E Pictures H20_FPGADI6 0 21 140821 thex 2408 2014221 FHEXF 74 KB B videos 3 Comput omputer amp osc st MEMORYCARD Ge USB1 QBTHub 50 Network re File name H20 FPGAD16 0 21 14082Lfhex FHex FPGA Files fhex Yawo Y Open ly Cancel Field Control Parameters Last Error o C rr State Measuring Figure 44 Selecting the fhex file to load H20 2 Loop 1 Address 2 Connected Busy Measuring Stop General 350 PDA PDB Properties Firmware Update PIC Code 300 Update FPGA Firmware Device 4 0 6 250 FPGA 0 0 21 Hardware Revision 0 Serial Number 0000001234 200 150 Field G Updating Firmware 100 DO NOT TURN OFF DEVICE POWER DO NOT CLOSE THE DIAGNOSTIC E Time Remaining 35 seconds 50 60 955 60 960 Time seconds m r ro X stri Scope J Histogram 5444 Samples de kal Data Setup Calibration Field Control Parameters Last Error a State Measuring Figure 45 FPGA update in progress When the upload is complete you will get a prompt to power cycle the H20 in order to load the
31. Diagnostics 24 Disposal We hope that the H20 gives you long and reliable service The H20 is manufactured to be compliance with the European Union RoHS Directive 2002 95 EC and as such should not present any health hazard Nevertheless when your device has reached the end of its working life you must dispose of it in accordance with local regulations in force If you are disposing of the product in the European Union this includes compliance with the Waste Electrical and Electronic Equipment Directive WEEE 2002 96 EC Please contact Pyramid Technical Consultants Inc for instructions when you wish to dispose of the device H20 User Manual H20 UM 140911 Page 73 of 75 PSI System Controls and Diagnostics 25 Declaration of Conformity Declaration of Conformity Issued by Pyramid Technical Consultants Inc 1050 Waltham Street Lexington MA 02421 USA The undersigned hereby declares on behalf of Pyramid Technical Consultants Inc that the referenced product conforms to the provisions as listed Refer to the document Extension of testing and analysis to the PTC product line December 10 2007 and its continuations and the 1400 Technical Construction File for detailed testing information Product H20 Dual Hall Probe Controller amp MFP 30 probe Year of initial manufacture 2014 Applicable Directives 73 23 EEC Low Voltage Directive Laws for electrical equipment within certain voltage limits 89 336 EEC EMC Dir
32. ER REFER TO MANUAL PPO 6 H20 User Manual H20 UM 140911 Page 9 of 75 PSI System Controls and Diagnostics 4 Models 4 1 Components H20 CTRL H20 control unit H20 CTRL S2 H20 control unit with field control servo feature MFP 30 MFP 30 field probe PSU24 40 1 Power supply 24 VDC 40W for H20 CAB H20 9 Connection cable between H20 and MFP 30 9 2 7 m CAB H20 15 Connection cable between H20 and MFP 30 15 4 6 m CAB H20 22 Connection cable between H20 and MFP 30 22 6 7 m 4 2 Pre configured system examples H20 SYS1 9 H20 system comprising H20 control unit one MFP 30 magnetic field probe and 9 2 7 m cable PSU24 40 1 power supply H20 SYS1 22 H20 system comprising H20 control unit one MFP 30 magnetic field probe and 22 6 7 m cable PSU24 40 1 power supply H20 SYS2 9 H20 system comprising H20 control unit two MFP 30 magnetic field probes and two 9 2 7 m cables PSU24 40 1 power supply H20 SYS2 22 H20 system comprising H20 control unit two MFP 30 magnetic field probes and two 22 6 7 m cables PSU24 40 1 power supply H20 SYS2 S2 22 H20 system comprising H20 control unit with field control feature two MFP 30 magnetic field probes and two 22 6 7 m cables PSU24 40 1 power supply H20 User Manual H20 UM 140911 Page 10 of 75 PSI System Controls and Diagnostics 5 Scope of Supply H20 system model
33. Observed step depends on selected downsampling and readout method Field control Optional field control feature on each channel Field target can be provided as a numeric value via the communications interface or as an analog voltage Process control output is analog voltage maximum range 10 V MFP 30 probe Analog signals Magnetic flux density Probe temperature Field range gt 2 5 Tesla 25 kGauss nominal on x1 gain setting Gain settings x1 x4 these combine with x1 and x10 settings in the H20 control unit to give four field ranges Hall element sensitive area mm square 1 mm Hall element position 7 5 mm from probe tip 1 17 mm below probe top surface position marked on casing Temperatur e Sensor Thermistor in probe tip calibrated measurement range 5C to 60C Probe tip thickness 2 3 mm 0 091 AC field compatibility Probe body materials non conductive Hall voltage and current H20 User Manual H20 UM 140911 Page 14 of 75 PSI System Controls and Diagnostics leads are small pitch twisted pairs Radiation resistance Only passive components are located at the probe tip Tested with 0 75 mC of 230 MeV protons delivered to a neutron producing target close to the probe with no measurable change in performance Corresponds to 1 2 years of typical particle therapy beamline dose Connector Lemo
34. Page 29 of 75 PSI System Controls and Diagnostics received by the PTCDiagnosticG2 The message frequency is displayed Connected LED When lit this indicates that communications are valid and the system is not in error Busy LED When lit this indicates the H20 is busy and cannot respond to inputs for example while writing to NVR Measuring LED When lit green this indicates that data acquisition is occurring Error LED When lit the H20 has logged an error The details are displayed in the message area Auto Initiate Checking this box causes the software to automatically initiate a new acquisition whenever you change any acquisition parameter Initiate This button starts data acquisition Abort This button terminates any acquisition in progress 10 4 Screen layout Message Log area State Measuring Last Error Gg E Figure 16 Message area This area shows all the commands and responses between the H20 and the host system plus any H20 errors which are shown in red You can clear the messages with the Clear Log Display button and you can clear latched errors with the Clear Last Error button Y 10 5 Screen layout Right hand tabs 10 5 1 Data tab The Data tab displays the instantaneous values of all analog input and output values including the two measured magnetic fields There are duplicate displays for the two probe channels H20 User Manual H20 UM 140911 Page 30
35. RU ee 61 18 5 Internal seiting3s3 s tea e ici edere RUE ARRA ERE Dee sue EAE NER ERR Y core e Vae eR SERE 62 H20 User Manual H20 UM 140911 Page 4 of 75 PSI System Controls and Diagnostics 18 5 1 JPR Settings toe eet eec e eee ert eet tee etre t tested 62 Eoo pudxmnePilcec e 63 19 1 FPGA firmware updates aie meae te eo ae eiit 63 19 2 PIC microcontroller firmware updates eese eene teen nne een eennen nnne nennen enne 65 20 ovs indir 66 j EBEr 70 22 Returns procedure 71 23 O ER 72 24 i A O NON 73 25 Declaration of Conformity cccooccoonconononnnnncnoncnononononacnoncnononononononocononoccncnnoncnoncoo nooo noc sesta setas sense taste sepes eaae eaae 74 26 REVISION ETE Am sises 75 H20 User Manual H20 UM 140911 Page 5 of 75 PSI System Controls and Diagnostics 2 Table of Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17 Figure 18 Figure 19 Figure 20 Figure 21 Figure 22 Figure 23 Figure 24 Figure 25 Figure 26 Figure 27 Figure 28 Figure 29 Figure 30 Figure 31 Figure 32 Figure 33
36. a programming adaptor A factory recall will be issued if an update is ever necessary The two other codes can be updated by upload from the host computer via the normal communications link The FPGA code in a file version with pof extension can also be loaded using an Altera adaptor This is only necessary in the event that the code has become corrupted Contact Pyramid Technical Consultants Inc for more advice in this case 19 1 FPGA firmware updates To update the FPGA click the Update FPGA Firmware button on the PTCDiagnosticG2 Properties tab and navigate to the relevant file The code will then load The process takes about 30 40 seconds H20 User Manual H20 UM 140911 Page 63 of 75 PSI System Controls and Diagnostics Xs PTCE Server 81 133 144207 Remote Desktop Connection E PTC Diagnostic 5 dicem Y sop system system 4 8 1922168168 4 loop_1 Ra H202 k M103 23601 O Start System Tie Windows Cf Initiate Al H20_2 Loop 1 Address 2 neral PDA PDB 350 Conne cted Measuring Initiate Stop Properties Firmware Update PIC Code Update FPGA Firmware 3 Open FHex FPGA File Go gt PTC Software Firmware H20 s Search H20 pl Organize New folder gt Of 5 Ye Favorites Name Date modified Ty Size BE Desktop H20_FPGAD16 0 09_131104 hex 04 11 2013 1 FHE B E E Recent Places H20_FPG
37. be tip to get a response H20 User Manual H20 UM 140911 Page 28 of 75 PSI System Controls and Diagnostics H20 2 Loop 1 Address 2 General PDA PDB 500 e m iz Mode Manual Mode 50 55 60 65 70 Setup i E Time seconds Y Auto x No Avg xj Zero 3 X Strip X Scope V Histogram 7 421 Samples d la a Calibration n L Cibran Field Control Parameters l Properties State Measuring Last Error Gg Figure 14 H20 connected and reading magnetic field The H20 user interface window is divided into two halves graphics and data on left and right respectively plus a top banner area Below the graphic is a message window which reports all the commands issued to the H20 by the PTC Diagnostic program and the corresponding acknowledgements Generally you can ignore this display when taking data but it will be valuable for diagnosis if you have any operating problems The data area on the right changes according to which display tab option you select with the option buttons at the bottom 10 3 Screen Layout Top banner M Comms 199 e e Connected Busy Measuring Error initiate g Stop Figure 15 Top banner display The top banner is always visible It contains the following indicators and controls Comms bar When moving this indicates that messages from the H20 are being H20 User Manual H20 UM 140911
38. bration of the unit contact Pyramid Technical Consultants to arrange a return for calibration We recommend that the H20 the MFP 30 and the connecting cable are all returned together for maximum calibration accuracy The H20 is fitted with a 1 1 A automatically resetting positive temperature coefficient PTC fuse in the 24 VDC input No user intervention is required if the fuse operates due to overcurrent The fuse will reset when the overcurrent condition ends H20 User Manual H20 UM 140911 Page 70 of 75 PSI System Controls and Diagnostics 22 Returns procedure Damaged or faulty units cannot be returned unless a Returns Material Authorization RMA number has been issued by Pyramid Technical Consultants Inc If you need to return a unit contact Pyramid Technical Consultants at support ptcusa com stating model serial number nature of fault An RMA will be issued including details of which service center to return the unit to H20 User Manual H20 UM 140911 Page 71 of 75 PSI System Controls and Diagnostics 23 Support Manual and software driver updates are available for download from the Pyramid Technical Consultants website at www ptcusa com Technical support is available by email from supportOptcusa com Please provide the model number and serial number of your unit plus relevant details of your application H20 User Manual H20 UM 140911 Page 72 of 75 PSI System Controls and
39. d G Figure 40 Field control graphic display A setpoint voltage of 0 4 V is being measured by the H20 which is operating in Analog Closed Loop mode This is converted to a field setpoint by multiplying by the Setpoint Gain which is 4000 Gauss per volt in the example Thus the field target is 1600 Gauss Every servo period which equals the averaging time period 1 msec in the example the error between the measured field and the setpoint field is used with the Kp term to give a new output control voltage to be sent to the power supply Err Bmeas Btarget dVctrl Kp Err Vctrl t Vctrl t 1 dVctrl The size of the change in control voltage dVctrl is limited to the Slew Limit setting times the servo period The control voltage range is limited by the Control min max setting If the Positive Only Output box is checked on the Field Control Parameters tab then the range is OV to H20 User Manual H20 UM 140911 Page 56 of 75 PSI System Controls and Diagnostics Control min max The power supply and magnet now respond to the new control voltage the field changes and the process repeats The sign of the Kp parameter depends on the orientation of the probe If the measured field vector becomes more positive with increasing control voltage then Kp must be negative to stabilize the loop If it becomes more negative with increasing control voltage then Kp must be positive 16 3 Tuning the control loop In
40. dde y Pending Error 6199 4 6199 3 6199 3 6199 3 4 6199 3 6199 3 6199 2 4 23 392 Buffer 2456 B M100 Chat PID Initiate 9 Measuring 6199 4 Abort Triggering Fast Mode 6199 4 w Triggers 2619 6199 4 Probe A vfauto 23 x rast l uc m u Elal MIE gt 01001 E Target 0 0000 G PI EE DAC 0 0000 y Probe B T MEEHEZ Target 0 0000 6 Cus NEED MERE DAC 0 0000 y 26 112 Board Temperature w Figure 26 H20 User Manual H20 connection to the PSI Diagnostic via an A500 loop controller H20 UM 140911 Page 39 of 75 PSI System Controls and Diagnostics 11 Connecting to Host Software Systems via IG2 and EPICS 1 4 What is EPICS The Experimental Physics and Industrial Control System EPICS http www aps anl gov epics iS A set of Open Source software tools libraries and applications developed collaboratively and used worldwide to create distributed soft real time control systems for scientific instruments such as particle accelerators telescopes and other large scientific experiments EPICS uses Client Server and Publish Subscribe techniques to communicate between the various computers Most servers called Input Output Controllers or IOCs perform real world I O and local control tasks and publish this information to clients using the Channel Access
41. ective Laws relating to electromagnetic compatibility Applicable Standards IEC 610101 2002 2 Edition UL 61010 1 2004 EN 61326 1997 A1 1998 A2 2001 EN 55011 1998 A2 2002 EN 61000 6 2 2001 Electromagnetic Compatibility Generic Standard Immunity for Industrial Applications Issuing Agencies Safety TUV Rheinland North America 12 Commerce Rd Newtown CT 06470 USA EMC TUV Rheinland North America 12 Commerce Rd Newtown CT 06470 USA Applicable Markings TUV FCC CE Authorized by P 2 is President Pyramid Technical Consultants Inc Date 28 Ty M LO I4 The Technical Construction File required by theses Directives are maintained at the offices of Pyramid Technical Consultants Inc 1050 Waltham Street Lexington MA 02421 USA A copy of this file is available within the EU at the offices of Pyramid Technical Consultants Europe Ltd Suite 3 Unit 6 7 Henfield Business Park Henfield BN5 9SL United Kingdom H20 User Manual H20 UM 140911 Page 74 of 75 PSI System Controls and Diagnostics 26 Revision History The release date of a Pyramid Technical Consultants Inc user manual can be determined from the document file name where it is encoded yymmdd For example MIO UM 080105 would be a M10 manual released on 5 January 2008 Version Changes H20 UM 140911 First general release H20 User Manual H20 UM 140911 Page 75 of 75
42. el that is selected for plotting and which has the greatest full scale setting smallest range multiplier will determine the value of full scale Display only positive values This control is enabled for fixed vertical scaling It toggles the graphic from a display that is symmetric around 0 to one that shows only 10 of the vertical scale in the negative direction Filtering Noavg x g 10x avg 100x avg 1000x av The PSI Diagnostic can apply a filter to the plotted data to allow you to pick small signals out of noise This filter is independent of and additional to the block averaging filtering implemented by the H20 itself The PSI Diagnostic filter is a simple IIR type Ypiot N Ynew A 1 1 A Y pit N 1 Where Y new is the latest reading Ypiot_n is the current value to be plotted Ypiot_n 1 is the prior plotted value and A is the averaging value from the pull down menu The filtering affects the graphed data and digital displays If you choose to save the buffered data you will have the opportunity to save the raw values or the filtered values Zero correction When you press zero the current values are captured and subtracted from all subsequent readings as displayed on all the graphic and digital Zero j displays until you press the clear zeroes button L If you choose to H20 User Manual H20 UM 140911 Page 36 of 75 PSI System Controls and Diagnostics
43. ely used 1 Wb 10e8 Mx You can consider that the magnetic field arises from a magnetizing field H which is due to the motion of charged particles usually electrons In the SI system H is measured in amp per meter A magnetizing field H produces a magnetic flux density B uH where u is the permeability of the local medium In vacuum the permeability uo 4x x 107 henry m 1 The permeabilities of other materials are expressed relative to this In ferromagnetic materials the relative permeability may be hundreds or thousands Air has a relative permeability of very nearly one however thus when you measure the B field with the H20 system you also get the H field in A m 1 after division by Ho The old cgs unit for magnetizing field is the Oersted 1 Oe 1000 47 A m 1 and in vacuum 1 Oe creates 1 Gauss H20 User Manual H20 UM 140911 Page 44 of 75 PSI System Controls and Diagnostics 12 2 Field vectors The B field is a vector field which you can decompose at any point into three orthogonal components Magnetic field lines are assumed by convention to point from the north pole to the south pole of a magnet A compass will point to the south pole of a magnet thus there is a south magnetic pole at the Earth s magnetic north pole Figure 30 Direction convention for magnetic field lines The MFP probe measures the field component that is perpendicular to the flat face of the probe at the position of the bulls eye mark I
44. emperature sensor and compensation MFP 30 Analog voltage monitor outputs for high speed representation of the measured field or magnet power supply programming Field control feature when used together with a suitable electromagnet power supply Analog voltage inputs for field settings or general purposes Analog bandwidth DC to 10 kHz Can be operated in a fiber optic serial communication loop with up to fifteen other devices 100BaseT Ethernet interfacing to a host computer available through the A360 A500 and A560 loop controllers H20 User Manual H20 UM 140911 Page 13 of 75 PSI System Controls and Diagnostics 8 Specification H20 System Number of channels Two fully parallel field measurement channels with temperature measurement and compensation Measurement ranges Not less than 2 5 T 25 kGauss on x1 range xl x4 x10 and x40 software selectable ranges External accuracy 0 05 maximum deviation relative to full scale of any point from linear fit to at least 10 points over a 1 T span Temperature coefficient of gain lt 100 ppm C 1 within 10C 5C of the calibration temperature Temperature coefficient of offset lt 0 01 Gauss C 1 within 10C 5C of the calibration temperature Noise 0 1 Gauss rms with 1 msec averaging Step response Better than 100 usec to within 0 1 of full scale deviation from target setting for any instantaneous field step
45. end to the power supply Set the H20 averaging time to suit the noise levels in your system and the servo loop rate you require Now you should deliver a low frequency sequence of typical upward and downward setting steps and gradually increase the absolute value of Kp and watch how the system responds The following examples are for a particularly slow magnet with high hysteresis and a slow unipolar power supply Some overshoot is necessary to get an acceptable step response time When Kp is made too high the system becomes unstable H20 User Manual H20 UM 140911 Page 57 of 75 PSI System Controls and Diagnostics Initiate J Stop J Fils Corral Parameters Frobe A Magnat Conr Praportonl Ka 1 000607 E une E Out Max vh 2000 200 7 v 1 0000 1 0000 4 00000 03 E 40000803 000805 E 1 000605 E 10 0000 10 0000 z V z oso g 05000 f E seponteen s mea E 400002403 E i Analog Closed Loop Oriy p 44255 Time eeconde Fosen aoa poe PO IA Initiate W Stp l W c H xS a iti stp J 2000 reu 2500 1500 20000 10m o 5 A 4 0000 03 1 000605 1 o00e 05 E 100000 E 10 000 1 400 E El cS 0 5000 amp 0 5000 3 Cetina iay aoco E 4 00000 03 1200 Analog Closed Loop Only analog Closed Loop Only 44535 44 540 44515 Time seconds Figure 41 Step response at increasing Kp setting So long as we can tolerate some overshoot then we can look in more detail at the settli
46. es via abstraction layers like the IG2 package H20 User Manual H20 UM 140911 Page 21 of 75 PSI System Controls and Diagnostics _ EA Ethernet LAN L Other a devices Fiber optic comms P w Figure 5 Schematic example H20 setup 24V in The use of the closed loop field control option is illustrated in figure 6 The PC provides a field target over the communication channel A PID control algorithm in the H20 computes a control setting for the magnet power supply to minimize the error between the target field and the measured field AERE Ethernet LAN Magnet PSU Fiber optic comms Electromagnet 24V in Figure 6 Schematic example setup for electromagnet field control In an alternative arrangement the field setting targets can be provided as analog voltages from an independent source H20 User Manual H20 UM 140911 Page 22 of 75 PSI System Controls and Diagnostics Field demand generator Ethernet LAN AA Magnet PSU Fiber optic comms Electromagnet 24V in Figure 7 Schematic example setup for electromagnet field control with independent field programming The two inputs of the H20 are independent You can measure two unrelated fields and
47. etermined in the factory and generally you should not need to change them unless you replace the probes See section 14 for more details on calibration 10 5 3 1 H20 Probe Temp Calibration sub tab H20 Probe A Gain Field 1x Range Offset 1 03 17 19 Field 10x Range 1 0298 40 55 Temp ADc 1 035 0 Analog Input 1 0363 15 Analog Output 9 9953 0 022 Monitor Mode Analog Output Gain v G 1 0000e 04 Figure 19 H20 calibration sub tab H20 User Manual H20 UM 140911 Page 33 of 75 PSI System Controls and Diagnostics Probe A B Gain and offset parameters for each H20 channel for the field input temperature input analog input and analog output Analog output gain The conversion factor that is used to create the output voltage from the V G measured field in monitor mode 10 5 3 2 Calibration sub tab Probe H20 Probe Temp Probe A Cal Temperature be 90 Defaults Probe A Gain Offset Field 1x Range 0 971 7 255 Field 4x Range 0 971 22 6 Figure 20 Probe calibration sub tab Cal Temperature The temperature measured by the probe in centigrade when it was calibrated used for temperature compensation Probe A B The gains and offsets associated with the probe 10 5 3 3 Calibration sub tab Temp Field Temperature Compensation V Enable Temp Compensation Probe A Comp 0 0 016771000 Comp 1 0 000170p00
48. f you orient the MFP 30 probe so that the field vectors point into the bulls eye you will get a positive field reading as shown in figure 31 where you can also see the deflection direction of a positive ion beam for the illustrated field direction and the current direction in the coils of an electromagnet producing the field ve field reading MFP 30 ve ions Figure 31 Direction convention for magnetic field lines H20 User Manual H20 UM 140911 Page 45 of 75 PSI System Controls and Diagnostics The sign of the field reading assumes you have a positive calibration gain value Should you wish to reverse the directionality then you must make the gain factor negative 12 3 Rate of Change of Magnetic Flux Density Any conductor loop which encloses an area through which the magnetic flux is changing with time will have a current induced in it If the loop is not shorted there will be a voltage induced across the terminals that is the negative of the rate of change of B integrated over the surface area of the loop d V B ds dt 5 We can assume that the loop area is small enough that B is constant over its area so we have dB V dt where is the area of the loop The resulting induced current magnitude and time profile will depend on the impedance of the loop This effect is important when you are measuring AC fields The MFP 30 is carefully designed to prevent circulating induced currents that might af
49. fect its readings You should take care that the position of the probe is not near conductive plates or loops that could affect the field reading unless you are deliberately trying to survey induced currents H20 User Manual H20 UM 140911 Page 46 of 75 PSI System Controls and Diagnostics 13 Circuit overview 13 1 MFP 30 Probe Thermistor D Temp signal 1 000 mA source Hall probe signal Hall device x10 x2 x8 cT oca b Hall probe gain select AGnd 12 V Probe tip Probe base amm Figure 32 MFP 30 probe block schematic The MFP 30 probe uses the very high performance HE244 Hall device which provides extremely low noise and drift A 1 000 mA constant current is provided from a current source Current stability is ensured by a precision bandgap voltage reference and high precision resistor The very small Hall effect voltage is amplified x10 by a differential instrumentation amplifier The following programmable gain amplifier can be set to x2 or x8 gain A line driver buffer amp with x2 gain sends the signal along the cable to the H20 Connections to the Hall device at the probe tip are made using tightly twisted pairs A thermistor temperature sensor is located at the probe tip close to the Hall device 12V power is provided by the H20 and filtered at the probe H20 User Manual H20 UM 140911 Page 47 of 75 PSI System Controls and Diagnostics 13 2 H20 Cont
50. fered acquisitions The model for the display is an oscilloscope 10 6 3 Histogram display The signal from each channel A B and the field targets C D S2 option only are displayed as vertical bars This mode emulates a graphic equalizer or rate meter and can be useful for instrument tuning You can place a cursor on the plot by clicking on one of the bars 15 000 10 000 Field G 5 000 A B e D E LF G H Channel Y 50 y 4 No Avg gt Zero 3 Strip X Scope JA Histogram 1009 Samples die E Figure 25 Histogram display 10 7 Installing and using the PSI Diagnostic Program If you have an A500 loop controller then the H20 can also be connected via the earlier PSI Diagnostic host program This Windows program requires the Microsoft net framework to be installed on your computer Otherwise the installation process is similar to the DiagnosticG2 installation The screen controls and readbacks are the same although the layout is different The software is not compatible with G2 devices including the A360 and A560 loop controllers age 38 of 75 ab H20 User Manual H20 UM 140911 P PSI System Controls and Diagnostics PSI Loop Diagnostic v4 145 A Actions Options Window Help giu o o System oo Bl s 5 ASOORSTS 192 168 1 238 100 S E Loop 8 B H20 H20Q Address 2 on Loop 8 on ASOORSTS 192 160 1 238 100 aran c Lal Es Comms
51. g ground 7 Temperature signal 3 Hall sensor signal 8 Analog ground 4 Hall signal gain select 9 12 VDC 5 Digital not used 10 12 VDC H20 User Manual H20 UM 140911 Page 59 of 75 PSI System Controls and Diagnostics 17 1 2 Analog signals Four Lemo 00 50 ohm coaxial one output upper connector and one input lower connector associated with each channel Suitable cable type RG 173 or RG 316 Impedance matching is not required 17 2 Rear panel connectors 17 2 1 Power input 2 1 mm threaded jack To mate with Switchcraft S761K or equivalent E Center pin 24VDC Outer 0V 17 2 2 Fiber optic communications ST bayonet To mate with ST male terminated fiber optic cable Recommended cable types 1 mm plastic such as Avago HFBR EUS 500 or 200 um silica such as OCS BC03597 10 BL Signal 650 nm light red Transmit Receive light grey dark grey H20 User Manual H20_UM_140911 Page 60 of 75 PSI System Controls and Diagnostics 18 Controls and Indicators 18 1 Front panel controls None 18 2 Rear panel controls 18 2 1 Address switch 16 position rotary switch setting device address Choice of address is arbitrary but each device in a fiber optic loop system must have a unique address Setting Function 0 F decimal 1 to 15 Available address settings 18 3 Front panel indicators None 18 4 Rear panel indicators Quad green LED Device Network
52. ication File pi QU I gt PTC Software Firmware H20 Organize New folder Name oF Favorites B Desktop H20 PIC4 0C_131111 hex E Recent Places H20 PIC4 0D_140118 hex Field G H20 PIC4 0F_140423 hex H20 PIC4 06_140522 hex 100 MEMORYCARD SP USB1 BTHub3 i Network File name H20 PIC4 0G 140522 hex Hex Application Files he v Cancel State Measuring Last Error a Figure 47 Selecting the hex file to load H20 User Manual H20 UM 140911 Page 65 of 75 PSI System Controls and Diagnostics 20 Fault finding Symptom Possible Cause Confirmation Solution Probe orientation not as expected Incorrect field readings Check orientation of the probe relative to the expected field direction Orient and secure the probe Probe out of position Check probe position Locate and secure the probe Calibration incorrect or corrupted Check calibration values for erratic values Contact supplier or Pyramid Technical Consultants Inc to arrange recalibration Default calibration has been loaded Gains are all 1 00 and offsets 0 00 Reload the saved calibration Temperature compensation not in use Check compensation parameters Use factory compensation values Mechanical stress on probe Check mounting arrangement Mount the probe securely by without applying bending force
53. ill flash showing that the device has automatically started measuring data It is simplest to start with to connect the H20 directly to a loop controller as the only device on the loop and with the loop controller connected directly to a PC by an Ethernet patch cable Figure 8 shows such a connection to an A360 which we shall use to illustrate operation with the PSI DiagnosticG2 software The H20 fiber optic loop address switch can be set to anything H20 User Manual H20 UM 140911 Page 24 of 75 PSI System Controls and Diagnostics between 0 and 15 F If you have more than one device on the loop then they must all have unique settings TEE Ethernet patch cabe Fiber optic comms 24V in Figure 8 Example of a direct connection to the H20 via an A360 and Ethernet The A360 loop controller has an IP address stored in its non volatile memory or it can be set for DHCP address allocation by a router It is simplest to start with if you set the A360 and your PC to a non conflicting IP4 static addresses in the same subnet range For example if the A360 has known IP address 192 168 1 68 then the PC could be 192 168 100 77 with subnet mask 255 255 255 0 The address of the PC is set up using the Local Area Connection Properties or Ethernet Properties dialog in Windows H20 User Manual H20 UM 140911 Page 25 of 75 PSI System Controls a
54. ire analog in field 2 20 Xchannel name r h20 1 templ wire analog in temp 1 gt 21 Xchannel name r h20 1 temp2 wire analog in temp 2 gt 22 lt channel name c h20 1 rangel wire int out range 1 23 Xchannel name c h20 1 range2 wire int out range 2 24 lt channel name c h20 1 monitor wire int out monitor 25 lt channel name c h20 1 init wire digital out initiate 26 lt channels gt 2 F lt board gt 28 lt boards gt 29 lt loop gt EN lt loops gt 31 lt loopcontroller gt 32 lt loopcontrollers gt interpreter lt devices gt lt epicscas type epicscas name epics server lt devices gt lt interpreter gt 40 lt system Figure 29 Example xml system configuration file for IG2 EPICS Once you have created and saved your system file you can run the IG2 service executable If the server has a display you will see a console window that shows the connection process and then records subsequent control value changes sent to the H20 The names you declared will now be recognized as process variables by any EPICS compatible client program CAUTION Don t try to control the H20 simultaneously from an EPICS client and from the PTC DiagnosticG2 The results will be confusing In particular if you attempt to run the IG2 service and PTC DiagnosticG2 on the same computer the communications will conflict H20 User Manual H20 UM 140911 Page 43 of 75
55. m rate of change allowed for the control voltage output Setpoint Gain The scaling that is applied to a voltage input to the H20 to give a target G V for the field control loop when in Analog Closed Loop mode 10 5 5 Properties tab This tab gives access to the embedded firmware update utilities and shows the currently installed versions The Update PIC Code and Update FPGA Firmware buttons start the update processes for the microcontroller and FPGA respectively See section 19 for details of the update process H20 User Manual H20 UM 140911 Page 35 of 75 PSI System Controls and Diagnostics Properties Firmware Update PIC Code Update FPGA Firmware Device 4 0 G FPGA 0 0 21 Hardware Revision 0 Serial Number 0000000000 Figure 23 Properties tab 10 6 Screen layout Graphics area There are three ways of displaying incoming field data in a graphical way as a rolling strip chart as a scope display and as a histogram Wsrie Sane Jiltistogram J Only the checked channels are displayed but both channels are always measured and logged You can plot the field target values also if your H20 has the S2 option Most controls are common to the plot types Y y Auto v 10096 50 20 10 5 2 1 ad This drop down controls the vertical scaling of the data plot You can select automatic scaling or various fixed proportions of the nominal full scale The chann
56. mode is suited to readout by a precision DVM or digitizer 15 3 Fast Monitor mode If you select Fast Monitor then the raw ADC conversions are scaled directly into output voltage V z ADC reading 32768 10 Accuracy is lower than normal monitor mode because the calibration is not used but the response to field changes is very fast limited only by the analog bandwidth of the H20 and MFP 30 because there is no averaging This mode is suited readout by an oscilloscope H20 User Manual H20 UM 140911 Page 53 of 75 PSI System Controls and Diagnostics 16 Field Control 16 1 Benefits of field control The response of an electromagnet with a ferromagnetic return yoke is non linear if the steel starts to saturate so a simple linear relationship between coil current and field is not reliable This could in principle be handled using a non linear calibration curve However all electromagnets with ferromagnetic iron return yokes also exhibit some hysteresis The observable result is that simply setting the coil current accurately does not guarantee that the magnet air gap field is reproducible It depends of the recent history of magnet excitation It is not always possible or practicable to trace out the same history to overcome hysteresis If a magnetic field probe is used to measure the field in the air gap however then a servo control loop can be used to drive the power supply current as necessary in order to achieve the target
57. n or give it a different name in which case you need to specify the path and file name by means of an argument in the command line that launches IG2 The system file comprises a header section on the xml schema which does not need to change Then comes a description of the user interface host computer descriptions of the fiber optic loop H20 User Manual H20 UM 140911 Page 41 of 75 PSI System Controls and Diagnostics controller devices in your system and descriptions of the devices attached to loops You don t have to describe every device and every input output point that is present in your system but only the ones that you expose in the system file will be visible to EPICS The simplified example in figure 29 shows the xml schema Two field measuring channels and two range controls only are exposed on the H20 normally you would expose a much more complete set of process variables The A360 is supporting the H20 as the only looped device The convention of wires for Pyramid device process variables and the fixed names of those wires for each supported product are described in the document 1g2 scripting vf 4 pdf where 1s the document revision number included with each release The document also describes how you can scale the values for example to convert voltages from general purpose I O devices to physical units relevant to the item they are controlling and how you can set up monitoring against tolerance band
58. nd Diagnostics n al Internet Protocol Version 4 TCP IPv4 Properties 9 jim General You can get IP settings assigned automatically if your network supports this capability Otherwise you need to ask your network administrator for the appropriate IP settings Obtain an IP address automatically Use the following IP address IP address 192 168 1 77 Subnet mask ps5 255 255 0 Default gateway Use the following DNS server addresses Preferred DNS server Alternate DNS server Validate settings upon exit Pa e J ee A d Figure 9 Setting up a Windows PC with a static IP address Having set up the simple network shown check that you can ping the loop controller r E C Windows system32 cmd exe icrosoft Windows Version 6 1 7601 opyright C EPIS Microsoft Corporation All rights reserved C Wsers John gt ping 192 168 1 68 with 32 bytes of data 68 bytes 32 time lt ims TTL 64 68 bytes 32 TTL 64 eply from 192 168 1 68 bytes 32 TTL 64 eply from 192 168 1 68 bytes 32 i TTL 64 statistics for 192 168 1 68 z Sent 4 Received 4 Lost z loss pproximate round trip times in milli seconds Minimum ms Maximum ims Average Bms Users John gt _ Figure 10 Pinging the loop controller Now you are ready to communicate with the H20 via the loop controller For this you will need to install a host program like the PTC DiagnosticG2 H2
59. nd Eclipse http www eclipse org that allows users to get started with little or no programming required There are various logging plotting post processing and alarm point tools A fully featured drag and drop user interface editor BOY allows quite complex customized user interfaces to be created with minimum development time As an example the following screenshot shows a simple user interface created in the CS Studio BOY OPI editor H20 EPICS CAS CSS Connectivity Demo Initiate 2024 95 ETA ChA AE ChB 25 kG range au ur Mode Manual mm Mode Manual 4022 08 3 Averaging time 100e 3 s d Held Gauss w S Figure 28 Example user screen created using CS Studio BOY 1 2 Installing and Configuring IG2 The IG2 package is available to users of Pyramid products It is supplied as a zip file which should be de compressed and the entire folder moved to the computer that will act as the server The server and the user interface computer can be the same machine The loop controller the server and the user interface computer should be able to communicate with each other over your network In the folders you have saved there is an xml files in the service subdirectory that need to be edited to customize your particular setup IG2 looks for the file system xml in the service subdirectory to establish the configuration of the system You can locate system xml elsewhere than the default locatio
60. ng after a step to choose the Kp value which gives the fastest convergence within an acceptable tolerance band The following example was recorded for a 20 msec averaging period in the H20 and various values of Kp The mauve curve is probably the best overall although the green curve at higher Kp would be faster if a wider tolerance band is acceptable zasa 2500 j 2392 4 2000 2390 2388 1500 2386 2384 1000 2382 soo 2380 14 16 18 20 22 24 14 16 18 20 22 24 Current control Field control Kp Se 6 Field control Kp 8 5e 6 Field contol Kp 1e S Field control Kp 1 5e 5 Current control Field control Kp Se 6 Field control Kp 8 5e 6 Field contol Kp 1e 5 Field control Kp 1 5e 5 Figure 42 Step response detail at increasing Kp setting magnified field scale on right H20 User Manual H20 UM 140911 Page 58 of 75 PSI System Controls and Diagnostics 17 Connectors 17 1 H20 control unit front panel connectors Channel A Channel B Figure 43 H20 front panel signal connections 17 1 1 Probe connections Two ten pin Lemo EXG 1B 310 female The connector on the MFP 30 probe is identical External view on connector solder side of mating plug Pins numbered anticlockwise from top left with 9 and ten in the center MFP 30 probe 1 Cable shield 6 Analog ground 2 Analo
61. nt and training The unit is designed to make measurements in Measurement Category I as defined in the standard Although the H20 does not generate dangerous voltages nor is it designed to measure directly such voltages in your application it may be measuring the field in electromagnets with high voltages present Appropriate precautions must be taken The unit must not be operated unless correctly assembled in its case Only Service Personnel as defined in EN61010 1 should attempt to work on the disassembled unit and then only under specific instruction from Pyramid Technical Consultants Inc or their authorized distributors The H20 unit is designed to operate from 24 VDC power with a maximum current requirement of 250 mA The MFP 30 probes are powered by the H20 A suitably rated power supply module is available as an option The H20 unit must be grounded by secure connection to a grounded conducting surface If the unit is mounted on an insulating surface then one of the four mounting screws must be re assigned as a grounding connection Some of the following symbols may be displayed on the unit and have the indicated meanings H20 User Manual H20 UM 140911 Page 8 of 75 PSI System Controls and Diagnostics Direct current Earth ground terminal Protective conductor terminal Frame or chassis terminal Equipotentiality Supply ON Supply OFF CAUTION RISK OF ELECTRIC SHOCK CAUTION RISK OF DANG
62. of 75 PSI System Controls and Diagnostics Mode Manual Mode Temperature Figure 17 H20 data tab If either field reading is close to overrange it is highlighted in red If an input has no probe connected then the values have no meanings and should be ignored In this situation the field will read close to zero and the temperature will show an obviously excessive reading around 120 C Range setting ix 4x 10x 40x These radio buttons set the combined gain of the MFP 30 probe and H20 unit for the channel Field The readings in Gauss for a probe connected to the channel If no probe is connected the reading will be close to zero The graph trace corresponding to a field reading is color coded Unchecking Field for a probe removes its trace from the graph Temperature The reading in centigrade for the channel from the thermistor in a connected MFP 30 probe If no probe is connected the reading will be high and should be ignored ADC The voltage reading on the analog input Lemo coax connector for the channel in volts DAC The voltage setting on the analog output Lemo coax connector for the channel in volts The control is only enabled when the mode setting is Manual H20 User Manual H20 UM 140911 Page 31 of 75 PSI System Controls and Diagnostics Setpoint The field target value in Gauss for the channel for closed loop control S2 field contr
63. ol option only In Digital Closed Loop mode the field becomes an edit box for the field in Gauss In Analog Closed Loop mode the field is a read only display of the field target calculated from the analog input voltage and the Setpoint Gain value on the Field Control Parameters tab The setpoint is plotted on the graphic if the box is checked Mode The selected mode selection for the channel for the analog inputs and outputs See section 15 for more details Temperature The temperature reading from the thermistor on the H20 PCB 10 5 2 Setup tab The Setup tab provides acquisition controls and settings for the analog input and output functions Setup Averaging Period 1 0008 04 ws Buffer Contiguous Data Probe A Serial Number 10 Mode Digital Closed Loop Y Probe B Serial Number 11 T MFP 30 Mode Fast Monitor Mode v Save And Recall Save Settings Recall Settings Settings Saved Y Figure 18 H20 setup tab Averaging period The H20 converts the incoming analog data at 250 kHz but the data is averaged downsampled to increase the signal to noise ratio The averaging can be varied between 100 usec 25 samples averaged and 0 25 seconds 62 500 samples averaged The drop down control offers some pre set averaging periods but other valid values can be entered directly H20 User Manual H20 UM 140911 Page 32 of 75 PSI System Controls and Diagnostics
64. oltage source You should not need to change the settings All the analog inputs have an offset expressed in ADC bits and a gain The corrected reading is given by Reading Gain V meas Offset where V meas is the measured signal at the ADC The gain value that is displayed is normalized to the nominal gain of the H20 so that a setting of 1 00 gives a roughly correct readout The analog output has a gain and offset expressed in volts Voltage out Gain Vpac Offset where Vpac is the DAC output voltage before correction and the gain is normalized as described above 14 3 MFP 30 probe calibration The MFP 30 is calibrated in the factory for a specified H20 input channel using a magnetic shield for the zero offset and an electromagnet and a high accuracy factory reference probe that is placed in the same field The reference probe is calibrated against an NMR probe The gains are normalized to the nominal conversion gain of the probe so that a setting of 1 00 gives a roughly correct readout You should not need to change the settings However you would need to transfer the settings and the probe serial number if you move the probe to another H20 channel either on the same H20 or another If you have the CAL MFPBO shield for the probe however you will be able to check and if necessary adjust the zero offset value This should only be done when the H20 and probe have been powered and allowed to stabilize for at least 30 minutes
65. perature compensation gain A typical value of again for the MFP 30 is about 0 00013 C with Again2 Close to zero The absolute accuracy of the H20 and MFP 30 is more than sufficient for most measurement and control applications with the normal factory temperature compensation The gain factors do vary slightly over the full field measurement range however If you require the best possible accuracy in the face of temperature variation over a more limited range of fields then you may request that the temperature compensation is optimized for that range as a special calibration order H20 User Manual H20 UM 140911 Page 52 of 75 PSI System Controls and Diagnostics 15 Monitor Outputs 15 1 Overview The analog outputs can be used to provide a real time indication of the measured field suitable for connection to a voltmeter or oscilloscope There are two monitor modes normal and fast The two channels are independent and can operate in different modes If the analog output is being used as a monitor then it is not available for direct manual setting or for field control 15 2 Monitor mode If you select Monitor then the field output as averaged and read form the calibration curve is converted to a voltage using the Analog Output Gain parameter and this voltage is delivered to the relevant Out Lemo coaxial connector V Measured Field in Gauss Analog Output Gain The limiting output voltage is 10 0 V This
66. rol Unit 42V gt DC DC DC DC 24V DC in AGnd 5 45V L LO PCB Status temp O LEDs Hall probe gain select A d lt h sensor gt gt Temp Probe A gt gt P ADC gt gt P Jpr 4 pole filter 10 kHz Analog out A lt lt E DAC Figure 33 H20 control unit block schematic channel A shown PIC Micro controller x1 x10 Hall probe signal A d Fiber optic Addr Analog in A The simplified block schematic above shows the channel A connections on the left These are duplicated for channel B The H20 control unit is derived from the widely used M40 general purpose I O device A field programmable gate array FPGA handles all input output and digital filtering and converts raw ADC numbers to physical units It communicates with the PIC microcontroller via an internal bus The microcontroller stores calibration values and reads an on board thermistor to monitor the H20 internal temperature The Hall probe and temperature inputs are connected to differential amplifiers The input amplifier for the Hall probe can be set to x1 or x10 gain Thus there are the following overall gain options for the combination of MFP 30 and H20 MFP 30 gain stages H20 gain Overall Bits Range Nominal full stages gain Gauss designation scale 10 2 2 1 40 1 1 x1 25 kGauss 10 8 2 1 160 4 5 x4 6 25 kGauss 10 2 2 10 400 11 2 x10 2 5 kGauss 10 8 2 10
67. s The choice of a corresponding working name for each wire is up to the user you may wish to choose something descriptive that is relevant to what you are measuring or controlling We nevertheless recommend a naming convention that makes it clear whether a value is a readback or control the prefixes c and r_ are used in the example which particular device the value is associated with and a number or letter to indicate the channel for multichannel devices H20 User Manual H20 UM 140911 Page 42 of 75 PSI System Controls and Diagnostics 1 lt 2xml version 1 0 encoding iso 8859 1 2 gt 2 lt system 3 xmlns http www ptcusa com 4 xmlns xsi http www w3 org 2001 xMLSchema instance 5 E xsi schemaLocation http www ptcusa com A510 xsd type pyramid gt 6 lt hosts gt lt host ip 192 168 1 77 name PTCE Server localhost true gt lt hosts gt i lt loopcontrollers gt lt loopcontroller type A360 name A360 1 ip 192 168 1 68 gt S i HHH lt loops gt 13 lt l A1 LOOP1 Md e be de de de de de de de e e e de e e e he he he he be dd RR ded d d de de de de de e e e e e e e e he he he RR RR NR ee le le whe de e de e e e whe whe 14 E loop number 1 name Slave device loop 10 da lt boards gt 1 E lt board type H20 name H20_1 address 2 gt 17 E lt channels gt 18 lt channel name r h20 1 fieldl wire analog in field 1 gt 19 Xchannel name r h20 1 field2 w
68. splay mica rcm ER E REO oed de edt 38 10 6 3 Histogram display viniera e deep ee et duet 38 10 7 Installing and using the PSI Diagnostic Program eese rennen eene eene 38 11 Connecting to Host Software Systems via IG2 and EPICS eese eee eee eee tenente atenta eae tn sn au 40 LI WhatisEPICS eaque aeu a o adeat ea ede die ep dete 40 1 2 Installing and Configuring 1G2 iis RE RIPE E Id a ERE e Rep aaa 4 LEM EP CAU EEEITTYS ISTE t 44 12 1 Measures of Magnetic Field Strength tddi 44 12 2 Field VECLOTS s teer AA ra ii a ERES 45 12 3 Rate of Change of Magnetic Flux Density eese eene ren een entren nre 46 13 Circuit OVervieW 47 13 1 MEP 30 Probes octo tite o a e c M o e tos Mb io ae 47 13 2 H20 Control Uniti te OR t a RR QURE DA REG QE e I o to idend 48 O 50 14 1 QJ a EE 50 H20 User Manual H20 UM 140911 Page 3 of 75 PSI System Controls and Diagnostics 14 2 H20 calibYaliOrisi2s utei tet ttr eh i eere der ibd eei tlle e Wes seyn 50 14 3 MEP 30 probe calibration iet p EDD qu 50 14 4 Temperature Coefficientss a ea A A AEA A AE E 51 EM To dimi 53 15 1 Overy ie Wisin CPR
69. spond very slowly Averaging period has been set very high Reduce period Set averaging appropriate to the required time resolution and noise levels Filtering is enabled in the Diagnostic host program Check averaging setting on the Data tab Use the correct filtering setting Unable to communicate with H20 Duplicate address setting Check address against expected address in host software Use correct switch setting Switches can be changed while the unit is operating Communication link timeout Investigate and fix communications issue Use a longer timeout setting if necessary H20 User Manual H20 UM 140911 Page 67 of 75 PSI System Controls and Diagnostics RX and TX cables cross connected somewhere in loop Network LED not lit Correct cabling Fiber optics are damaged Inspect fibers especially the connectors Check light can be seen through fiber Exchange fibers and retry Fit new fibers or re terminate as necessary Communications interruptions Other processes on PC host interfering with comms ports Use a dedicated PC with simple configuration and minimum number of processes running PSI Diagnostic will not connect to devices Two copies of program running Run a single instance only Random changes to parameters Another host program is interacting with the same H20 Check software running on hos
70. t computer 1 kHz typical up to 10 kHz in lightly loaded networks Physical features Probe connector Lemo 10 way EXG 1B 310 Controls 16 position rotary switch for loop address selection Displays Four LEDs power activity network device Power input 24 VDC 12 V 4 V 120 mA typical with two probes 200 m maximum Case Stainless steel Dimensions see figures 1 and 2 Case protection rating The case is designed to rating IP43 protected against solid objects greater than 1mm in size protected against spraying water Weight 0 33 kg 0 72 Ib Operating environment 0 to 35 C 15 to 25 C recommended to reduce drift and offset 8096 humidity non condensing vibration 0 2 g all axes 1 to 100 Hz Shipping and storage environment 10 to 50C 8096 humidity non condensing vibration 2 g all axes 1 to 100 Hz H20 User Manual H20 UM 140911 Page 16 of 75 PSI System Controls and Diagnostics Analog O Hall probe inputs Address selector Status LEDs Fiber optic RX Fiber optic TX 24VDC powerin VU RLY Se Power Transmit Receive A V 24V YV Figure 1 H20 control unit end panels H20 User Manual H20 UM 140911 Page 17 of 75 PSI System Controls and Diagnostics
71. tic slave devices It uses TCP IP and UDP Ethernet communications when connected to G2 loop controllers The PTC DiagnosticG2 is recommended for the H20 as all new G2 devices are compatible with it Both Diagnostics are standalone Windows programs which allow you to set outputs and read graph and log data from the H20 Their user interfaces are similar The PTC DiagnosticG2 is also available for Linux call Pyramid Technical Consultants for further details For some applications one of the Diagnostic programs may be adequate for all of your data acquisition needs In any event it is useful to understand what you can do with the Diagnostic programs because they expose all of the functions of the devices they connect to Application programmers will find this useful to help decide which functions to implement in their own host software 10 1 Preparing the H20 and MFP 30 for operation Inspect the unit carefully to ensure there is no evidence of shipping damage If there appears to be damage or you are in doubt contact your supplier before proceeding Connect one or two probes to the H20 control unit using the cable s supplied Connect 24 V DC power The LEDs will go through a startup sequence when the power is applied All four LEDs light then the power LED stays lit while the other three indicators light in sequence When the H20 has started correctly and prior to connecting to a controller the power LED will remain lit and the device LED w
72. ts that could access the H20 Run a single host program only Field control does not function S2 option is not installed Check H20 configuration Upgrade H20 if required Field control unstable Kp value too high Reduce Kp Re check tuning for the setup Kp value needs to change Reduce Kp Re check tuning for the setup because averaging period has changed Field control very slow Kp too low Increase Kp Re check tuning for the setup Kp value needs to change Increase Kp Re check tuning for the setup because averaging period has changed Slew limit too low Increase to suit power supply compliance Re check tuning for the setup H20 User Manual H20 UM 140911 Page 68 of 75 PSI System Controls and Diagnostics Field control runs immediately to output limit Kp wrong sign Check value User correct Kp polarity Probe is inverted in the field Check orientation User correct Kp polarity Unable to set low field in a unipolar system Magnet remnant field exceeds the setting Check actual field at minimum De gauss the magnet if lower setting is needed H20 User Manual H20 UM 140911 Page 69 of 75 PSI System Controls and Diagnostics 21 Maintenance The H20 does not require routine maintenance or calibration There are no user serviceable parts inside the case of the control unit If you require re cali

Manual - Pyramid Technical Consultants

Contents

Download Pdf Manuals

Related Search

Related Contents