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  5. User Manual

Lakeshore 647 User Manual

Other manuals for 647: User Manual
Manual is about: Magnet Power Supply

Summary of 647

  • Page 1

    Rev. 1.0 19 january 1998 p o w e r f a u l t p e r s i s t e n t switch heater magnet power s upply 7 lo c al e s c 9 8 7 lo c al e s c 9 8 4 r e m o t e 6 5 1 3 2 0 e n t e r +/- . F u n c t i o n m e n u n e x t m e n u n o r m a l d is p lay c u r s o r data entry functions m o d e o u t p u t i ...

  • Page 2

    Lake shore model 647 magnet power supply user’s manual a magnet power supply configuration sales order number: _______________________________ mps model number:_____________________________ shipping date: ____________________________________ mps serial number: _____________________________ power set...

  • Page 3

    Lake shore model 647 magnet power supply user’s manual table of contents i table of contents chapter/paragraph title page list of illustrations............................................................................................................................ Iv list of tables .................

  • Page 4

    Lake shore model 647 magnet power supply user’s manual table of contents ii chapter/paragraph title page 3 operation................................................................................................................................... 3-1 3.0 general .......................................

  • Page 5

    Lake shore model 647 magnet power supply user’s manual table of contents iii chapter/paragraph title page 6 options and accessories .................................................................................................... 6-1 6.0 general.......................................................

  • Page 6

    Lake shore model 647 magnet power supply user’s manual table of contents iv list of illustrations figure no. Title page 1-1 four-quadrant power ..................................................................................................................... 1-4 1-2 comparison of old and new mps ...

  • Page 7: Foreword

    Lake shore model 647 magnet power supply user’s manual forward v foreword purpose and scope this manual contains user instructions for the model 647 superconducting magnet power supply. Lake shore cryotronics, inc. Designed, manufactures, and assembles the mps in the united states of america. We wel...

  • Page 8

    Lake shore model 647 magnet power supply user’s manual forward vi electrostatic discharge electrostatic discharge (esd) may damage electronic parts, assemblies, and equipment. Esd is a transfer of electrostatic charge between bodies at different electrostatic potentials caused by direct contact or i...

  • Page 9

    Lake shore model 647 magnet power supply user’s manual forward vii magnet quenches for protection during a magnet quench, fit the dewar with pressure relief valves of sufficient size and pressure rating to allow the helium gas to escape and to prevent excessive pressure in the dewar. Operating a mag...

  • Page 10

    Lake shore model 647 magnet power supply user’s manual forward viii safety summary observe the following general safety precautions during all phases of operation, service, and repair of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual viol...

  • Page 11: Chapter 1

    Lake shore model 647 magnet power supply user’s manual introduction 1-1 chapter 1 introduction 1.0 general this chapter covers features (paragraph 1.1), specifications (paragraph 1.2), and operating characteristics (paragraph 1.3). 1.1 647 magnet power supply features • true, four-quadrant bidirecti...

  • Page 12

    Lake shore model 647 magnet power supply user’s manual introduction 1-2 1.2 specifications below are performance specifications for current with a 1 henry load and voltage with a resistive load. Dc output: true, four-quadrant, bidirectional power flow output. Autoranging current and voltage operate ...

  • Page 13

    Lake shore model 647 magnet power supply user’s manual introduction 1-3 agency approvals: the model 647 complies with the following requirements: ul 1244 - electrical and electronic measuring and testing equipment vde 0411 - electronic measuring instruments and automatic controls fcc 15j - level a r...

  • Page 14

    Lake shore model 647 magnet power supply user’s manual introduction 1-4 1.3 operating characteristics many model 647 mps operating characteristics ideally suit it for charge and discharge cycling of superconducting magnet loads. These characteristics significantly differentiate the model 647 from co...

  • Page 15

    Lake shore model 647 magnet power supply user’s manual introduction 1-5 1.3.2 low noise, high stability current regulated output model 647 mps: maintains a high-stability low-noise current-regulated output. Digital setting and monitoring electronics, and computer interfacing integrate into power man...

  • Page 16

    Lake shore model 647 magnet power supply user’s manual introduction 1-6 this page intentionally left blank.

  • Page 17: Chapter 2

    Lake shore model 647 magnet power supply user’s manual setup & connections 2-1 chapter 2 initial setup and connections 2.1 inspecting and unpacking the mps ships in a special cardboard box with integrated forklift skid openings. Do not stack anything on top of the mps box. Upon receipt, set the box ...

  • Page 18

    Lake shore model 647 magnet power supply user’s manual setup & connections 2-2 2.4 connecting the mps to power read and thoroughly understand sections 2.4.1 through 2.4.3 and the safety recommendations in the forward before connecting the mps to power. Failure to do so may expose operating personnel...

  • Page 19

    Lake shore model 647 magnet power supply user’s manual setup & connections 2-3 use this procedure to connect input power to the mps: 1. Loosen the two connector cover screws and open the cover. 2. Slip the strain relief over the power cable with the flanged end at the end to be terminated. 3. Attach...

  • Page 20

    Lake shore model 647 magnet power supply user’s manual setup & connections 2-4 2.5.2 shielding, grounding, and noise for noise reduction, tightly twist and shield the leads from the mps to the magnet. Connect the shield to the mps chassis as shown in figure 2-4. Warning: do not place magnet leads in...

  • Page 21

    Lake shore model 647 magnet power supply user’s manual setup & connections 2-5 2.5.6 mps analog current and voltage monitoring connections the mps provides amplified and buffered current and voltage monitor output signals at the terminal block on the back panel. Connect these signals to external met...

  • Page 22

    Lake shore model 647 magnet power supply user’s manual setup & connections 2-6 2.5.8 remote sense connections the factory configures the mps to sense, but not control remote voltage. Call lake shore to reconfigure the mps to control voltage at the load. When using remote sense, the mps measures volt...

  • Page 23

    Lake shore model 647 magnet power supply user’s manual setup & connections 2-7 use the procedure below and see figure 2-5 to connect multiple mps units in auto-parallel configuration: 1. Turn off all units and completely disconnect power at the source before changing mps configuration. 2. Determine ...

  • Page 24

    Lake shore model 647 magnet power supply user’s manual setup & connections 2-8 8. Verify all connections as summarized in table 2-5. 9. To add a third mps or a fourth mps in parallel, make the ri/flt, ovp, cmp and output connections in parallel with the connections of mps 1 and mps 2. For mps 3, set...

  • Page 25

    Lake shore model 647 magnet power supply user’s manual setup & connections 2-9 2.7 post-installation instructions the mps is electrically and mechanically inspected and operationally tested prior to shipment. It should be damage-free and in perfect working order upon receipt. To confirm this, visual...

  • Page 26

    Lake shore model 647 magnet power supply user’s manual setup & connections 2-10 this page intentionally left blank.

  • Page 27: Chapter 3

    Lake shore model 647 magnet power supply user’s manual operation 3-1 chapter 3 operation 3.0 general this chapter covers seven areas: mps front panel (paragraph 3.1), power up (paragraph 3.2), setting current on an mps with manual psh control (paragraph 3.3), setting current with automatic psh contr...

  • Page 28

    Lake shore model 647 magnet power supply user’s manual operation 3-2 3.3 general display description in general, screen displays are split into two sections. The left section is the entry window where users enter new parameters. The right section is the menu window where menus display when output va...

  • Page 29

    Lake shore model 647 magnet power supply user’s manual operation 3-3 3.5.2 output only screen press the output only function key to fill the display screen with the output values. 3.5.3 display plot screen press the display plot function key to display a graphic plot of output values on the left sid...

  • Page 30

    Lake shore model 647 magnet power supply user’s manual operation 3-4 3.7 function menu 3 screen press function menu to display function menu 1. Press next menu twice to display function menu 3. Exit menu returns to the display screen the function menu 3 was entered from. Current zero enters the curr...

  • Page 31: Chapter 4

    Lake shore model 647 magnet power supply user’s manual remote operation 4-1 chapter 4 remote operation 4.0. General either of two computer interfaces available for the model 647 permit remote mps operation: the ieee-488 interface (paragraph 4.1) and the serial interface (paragraph 4.2). Use only one...

  • Page 32

    Lake shore model 647 magnet power supply user’s manual remote operation 4-2 4.1.2 ieee-488 command structure the model 647 supports several command types. There are three groups of commands: 1. Bus control – see paragraph 4.1.2.1. A. Universal (1) uniline (2) multiline b. Addressed bus control 2. Co...

  • Page 33

    Lake shore model 647 magnet power supply user’s manual remote operation 4-3 the status byte register consists of a single data byte containing seven bits of mps status information. Status byte register format 7 6 5 4 3 2 1 0 bit 128 64 32 16 8 4 2 1 weighting sdr srq esb ovp err rsc lim odr bit name...

  • Page 34

    Lake shore model 647 magnet power supply user’s manual remote operation 4-4 4.1.3.2 standard event status and standard event status enable registers the standard event status register supplies various conditions of the instrument. Standard event status register format 7 6 5 4 3 2 1 0 bit 128 64 32 1...

  • Page 35

    Lake shore model 647 magnet power supply user’s manual remote operation 4-5 4.1.4.2 run the example quickbasic program use the following procedure to run the quickbasic program. 1. Copy c:\gpib-pc\qbasic\qbib.Obj to the quickbasic directory (qb4). 2. Change to the quickbasic directory and type: link...

  • Page 36

    Lake shore model 647 magnet power supply user’s manual remote operation 4-6 table 4-1 sample basic ieee-488 interface program ' ieeeexam.Bas example program for ieee-488 interface ' ' this program works with quickbasic 4.0/4.5 on an ibm pc or compatible. ' ' the example requires a properly configure...

  • Page 37

    Lake shore model 647 magnet power supply user’s manual remote operation 4-7 national instruments gpib0 configuration gpib-pc2/2a ver 2.1 primary gpib address............ → 0 ↑ select the primary gpib address by secondary gpib address.......None using the left and right arrow keys. Timeout setting .....

  • Page 38

    Lake shore model 647 magnet power supply user’s manual remote operation 4-8 4.2. Serial i/o interface rs-232c is a standard of the electronics industries association (eia) and one of the most common interfaces between a computer and electronic equipment. The customer supplied computer must have a se...

  • Page 39

    Lake shore model 647 magnet power supply user’s manual remote operation 4-9 4.2.1 serial interface hardware configuration below is a technical description of the 6224 option card for the serial interface configuration. (note: see appendix c for serial interface on cmp.) table 4.2 defines communicati...

  • Page 40

    Lake shore model 647 magnet power supply user’s manual remote operation 4-10 table 4-3 sample basic serial interface program ' serexam.Bas example program for serial interface ' this program works with quickbasic 4.0/4.5 or qbasic on an ibm pc or compatible ' with a serial interface. It uses the com...

  • Page 41

    Lake shore model 647 magnet power supply user’s manual remote operation 4-11 4.3 summary of ieee-488/serial interface commands below is an alphabetical list of ieee-488/serial interface commands consisting of operational commands (paragraph 4.3.1.1), interface commands (paragraph 4.3.1.2), ramping c...

  • Page 42

    Lake shore model 647 magnet power supply user’s manual remote operation 4-12 4.3.1.1 operational commands description below is a list of mps operational commands which configure the various functions. Err?: error status query input: err? Returned: [ovp] [ri] [step] remarks: returns 0 if the error is...

  • Page 43

    Lake shore model 647 magnet power supply user’s manual remote operation 4-13 ri?: remote inhibit status query input: ri? Returned: 0 if the remote inhibit is inactive, or 1 if it is active. Remarks: one character plus up to two terminators are returned. Vout? (v?): output voltage query input: vout? ...

  • Page 44

    Lake shore model 647 magnet power supply user’s manual remote operation 4-14 4.3.1.2 interface commands description the mps interface commands below help configure ieee-488 interface compatibility for a variety of computer equipment. End: programs mps interface eoi (end or identify) status input: en...

  • Page 45

    Lake shore model 647 magnet power supply user’s manual remote operation 4-15 4.3.1.3 ramping commands description the following mps ramping commands configure the various functions of the ramping features. Ramp: programs ramp segment parameters input: ramp[segment],[initial ramp current],[final ramp...

  • Page 46

    Lake shore model 647 magnet power supply user’s manual remote operation 4-16 4.3.1.4 current zero commands description the following mps commands configure the various functions of the current zero features. Imode?: current programming mode query input: imode? Returned: 0 if i mode switch is set to ...

  • Page 47

    Lake shore model 647 magnet power supply user’s manual remote operation 4-17 4.3.1.5 current step limit commands description the following mps commands configure the various functions of the current step limit features. Istp: programs output current step limit input: istp [step limit] where [step li...

  • Page 48

    Lake shore model 647 magnet power supply user’s manual remote operation 4-18 4.3.1.6 common commands description the mps common commands below are input/output commands defined by the ieee-488 standard and shared with other instruments complying with the standard. Common commands begin with “*”. *cl...

  • Page 49

    Lake shore model 647 magnet power supply user’s manual remote operation 4-19 *idn?: identification query input: *idn? Returned: manufacturer, model number, model serial number, firmware date. Remarks: returns seventeen characters plus up to two terminators. Example: lsci,622,0,120193[term] *opc: ope...

  • Page 50

    Lake shore model 647 magnet power supply user’s manual remote operation 4-20 * sre: enables status reports in the service request enable register input: *sre [bit weighting] where [bit weighting] = the sum (000 to 255) of bit weighting of each bit to be set. See the discussion on registers and below...

  • Page 51: Chapter 5

    Lake shore model 647 magnet power supply user’s manual options & accessories 5-1 chapter 5 error messages and troubleshooting 5.0 general this chapter covers software error messages (paragraph 5.1), factory default settings (para- graph 5.2), calibration procedure (paragraph 5.3), performance test (...

  • Page 52

    Lake shore model 647 magnet power supply user’s manual troubleshooting 5-2 no delay is allowed (cal and id switch 7 off, down) and multiple mps operation (cal and id switch 4 on, up) must be selected. After the load discharges, turn off all units to reset. The mps displays the ovp error message. Ove...

  • Page 53

    Lake shore model 647 magnet power supply user’s manual options & accessories 5-3 rail fault detected excessive dc rail voltage (unable to return power to the utility or some other internal fault), causes the mps to display: i step limit exceeded when the user attempts to change the current setting b...

  • Page 54

    Lake shore model 647 magnet power supply user’s manual troubleshooting 5-4 5.3 calibration note: calibration is only as accurate as the current monitor shunt. The factory uses a current monitor shunt rated at 0.02% accuracy. Shunt manufactur- ers typically stock accuracy values of 0.25% or better. T...

  • Page 55

    Lake shore model 647 magnet power supply user’s manual options & accessories 5-5 20. Convert dvm voltage reading to current. A reading of +0.512345v equals +51.2345a. Send actual current with ‘calpl+xxx.Xxxx’. If actual current is +51.2345a, send ‘calpl+51.2345’. The mps determines the positive curr...

  • Page 56

    Lake shore model 647 magnet power supply user’s manual troubleshooting 5-6 14. Set output current to +100 amps. The dvm should read about +66 mv. After about 1 minute, the dvm should read +66.666 mv ±0.233 mv (not including offset from step 9). 15. Set output current to -50 amps. The dvm should read...

  • Page 57

    Lake shore model 647 magnet power supply user’s manual 5-7 troubleshooting 5.6 ieee-488 interface connector (when model 6224 option is present) connect to the rear mps ieee-488 interface connector with cables specified in the ieee-488- 1978 standard document. The cable has 24 conductors with an oute...

  • Page 58

    Lake shore model 647 magnet power supply user’s manual options & accessories 5-8 this page intentionally left blank.

  • Page 59: Chapter 6

    Lake shore model 647 magnet power supply user’s manual options & accessories 6-1 chapter 6 options and accessories 6.0 general this chapter covers model 647 mps options and accessories: model 6224 ieee-488/serial interface (paragraph 6.1), model 6476 gaussmeter input card (paragraph 6.2), model 6477...

  • Page 60

    Lake shore model 647 magnet power supply user’s manual options & accessories 6-2 in the mechanical orientation or in the direction of either the magnetic field or the control current will result in a polarity change of the output voltage. The active area of the model hgca-3020 axial hall sensor is a...

  • Page 61

    Lake shore model 647 magnet power supply user’s manual options & accessories 6-3 6.2.4 operation to access field monitoring, press function menu, then next menu. Function menu 2 displays. Press the field function key to display the field measurement screen. The menu window returns to displaying the ...

  • Page 62

    Lake shore model 647 magnet power supply user’s manual options & accessories 6-4 buni? Magnetic field units query input: buni? Returned: either kg for kilogauss or t for tesla (10 kilogauss). Remarks: returns two characters plus up to two terminators. Ibs? Magnetic field summary query input: ibs? Re...

  • Page 63

    Lake shore model 647 magnet power supply user’s manual options & accessories 6-5 6.4 accessories accessories are devices that perform a secondary duty as an aid or refinement to the primary unit. Below are accessories for the model 647 mps: model number description of accessory 106-720 terminal bloc...

  • Page 64

    Lake shore model 647 magnet power supply user’s manual options & accessories 6-6 this page intentionally left blank.

  • Page 65: Appendix A

    Lake shore model 647 magnet power supply user’s manual magnetic units a-1 appendix a units for magnetic properties conversion from cgs to si units quantity symbol gaussian & cgs emu a conversion factor, c b si & rationalized mks c magnetic flux density, magnetic induction b gauss (g) d 10 -4 tesla (...

  • Page 66

    Lake shore model 647 magnet power supply user’s manual magnetic units a-2 this page intentionally left blank.

  • Page 67: Appendix B

    Lake shore model 647 magnet power supply user’s manual mainframe remote operation b-1 appendix b mainframe control bus operation b1.0 general there are seven elements to the model 647 mainframe control bus operating instructions: control bus serial interface specifications (paragraph b2.0), control ...

  • Page 68

    Lake shore model 647 magnet power supply user’s manual mainframe remote operation b-2 b4.0 control bus serial interface configuration configure the control bus serial interface for either rs-232c or rs-485 communications with dip switches on the communications processor board (cmp). The cmp plugs in...

  • Page 69

    Lake shore model 647 magnet power supply user’s manual mainframe remote operation b-3 b6.0 control bus serial interface operation the host computer initiates the serial interface link and transmits either a command or a query to the mainframe. The mainframe stores the characters in a buffer until th...

  • Page 70

    Lake shore model 647 magnet power supply user’s manual mainframe remote operation b-4 b7.0 control bus serial interface sample program the following pc program is an interactive program that prompts the user for a mainframe command and displays the mainframe response. The command must include a quer...

  • Page 71

    Lake shore model 647 magnet power supply user’s manual mainframe remote operation b-5 table b-1 mps mainframe control bus remote command summary input command query function *cls – clear all pending status. *ese *ese? Event status register enable. – *esr? Event status register contents. – *idn? Prod...

  • Page 72

    Lake shore model 647 magnet power supply user’s manual mainframe remote operation b-6 table b-2 additional mps mainframe control bus remote commands input command query function – adr mainframe address. Multidrop address 0-32 available. Commands sent must have the address as the first character. Que...