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Lake Shore 648 User Manual

Manual is about: Electromagnet Power Supply

Summary of 648

  • Page 2

    Model 648 electromagnet power supply limited warranty statement warranty period: three (3) years 1. Lake shore warrants that products manufactured by lake shore (the "product”) will be free from defects in materials and work- manship for three years from the date of purchaser's physical receipt of t...

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    Eu declaration of conformity this declaration of conformity is issued under the sole responsibility of the manufacturer. Manufacturer: lake shore cryotronics, inc. 575 mccorkle boulevard westerville, oh 43082 usa object of the declaration: model(s): 648 description: electromagnet power supply the ob...

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    Model 648 electromagnet power supply.

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    Model 648 electromagnet power supply 3.10 analog input/output connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 3.10.1 external current programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2...

  • Page 10

    Model 648 electromagnet power supply 6.11.4.1 flow switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 6.11.4.2 water control valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

  • Page 12

    2 c hapter 1: introduction model 648 electromagnet power supply 1.2 output architecture the low electrical noise design of the model 648 makes it the ideal power supply for use with large electromagnets in high precision laboratory settings, ensuring greater resolution and finer detail in data taken...

  • Page 14

    4 c hapter 1: introduction model 648 electromagnet power supply connector: shared 15-pin d-sub 1.9.3 readings output current resolution: 1.0 ma accuracy: ±20 ma ±0.05% of rdg update rate: 2.5 rdg/s display, 10 rdg/s interface output voltage (at supply terminals) resolution: 1.0 mv accuracy: ±10 mv ±...

  • Page 16

    6 c hapter 1: introduction model 648 electromagnet power supply 1.11 ordering information model 648 part number description 648-200 model 648 ±135 a ±76 v, 9.1 kw, 200 vac 648-208 model 648 ±135 a ±76 v, 9.1 kw, 208 vac 648-220 model 648 ±135 a ±76 v, 9.1 kw, 220 vac 648-230 model 648 ±135 a ±76 v, ...

  • Page 18

    8 c hapter 1: introduction model 648 electromagnet power supply prevent cooling water condensation do not operate the power supply when cooling water temperature is at or lower than the dew point for local atmospheric conditions. Condensation on cooling water lines inside the power supply can cause ...

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    10 chapter 2: magnet system design, installation, and operation model 648 electromagnet power supply 2.3 magnet construction the magnet consists of two water-cooled coils surrounding adjustable iron poles, which are fitted into an iron frame. The frame supports the poles and coils, and improves the ...

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    12 chapter 2: magnet system design, installation, and operation model 648 electromagnet power supply 2.4.3 temperature switches and flow switches as discussed in section 2.4.1, water-cooling for the magnet is essential. To protect the magnet from damage resulting from an interruption in cooling wate...

  • Page 24

    Maximum current output vs. Resistance typical curves of field vs. Current for 6 inch pole face on the em7 typical curves of field vs. Current for 4 inch pole face on the em10 14 chapter 2: magnet system design, installation, and operation model 648 electromagnet power supply figure 2-5 figure 2-6 fi...

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    16 chapter 2: magnet system design, installation, and operation model 648 electromagnet power supply.

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    18 chapter 3: installation model 648 electromagnet power supply 3.2.1 moving and handling casters are installed on the base to allow the unit to be rolled around. Four lifting lugs are provided for ease of moving and handling the model 648. Always use all four lift- ing lugs when lifting the unit. B...

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    20 chapter 3: installation model 648 electromagnet power supply 3.4.1 line voltage selection the model 648 has seven ac line voltage configurations covering seven different input voltages. The nominal voltage and voltage tap setting and the circuit breaker current setting for each configuration is s...

  • Page 32

    22 chapter 3: installation model 648 electromagnet power supply failure to install a strain-relief bushing is a hazard and could cause injury or death to the operating personnel in the event of a fault. Lake shore reserves the right to void the warranty of any instrument not properly installed. Typi...

  • Page 34

    24 chapter 3: installation model 648 electromagnet power supply 3.4.6 wiring cover when the power wiring, voltage setting and current setting are complete, install the wiring cover with the four 6-32 × 3/8, and the two 10-32 × 5/i screws provided. The wiring cover installation is shown in figure 3-7...

  • Page 36

    Typical auxiliary connector wiring enable stop remote chassis emergency fault com fault no fault nc chassis remote enable emergency stop fault nc fault no fault com chassis remote enable emergency stop fault com fault no fault nc no switches emergency stop and remote enable alarm contacts to remote ...

  • Page 38

    28 chapter 3: installation model 648 electromagnet power supply 3.9 magnet cable connections magnet cable connections are made at the output + and - terminals on the rear panel. These plated copper bus bars accommodate m8 ( 5/bg in) mounting hardware. Two m8 bolts, nuts, and belleville washers are p...

  • Page 40

    30 chapter 3: installation model 648 electromagnet power supply 3.11.2 ieee-488 interface connection an ieee-488 port has been provided to allow remote computer control of the power supply. Refer to chapter 5, computer interface operation. 3.12 chassis connection a 10-32 screw has been provided for ...

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    Model 648 power push buttons 32 chapter 4: operation model 648 electromagnet power supply when the model 648 is turned on, the display shows the lake shore logo and the alarm beeper sounds briefly. After a few seconds, a “checking hardware” message will appear in the center of the logo display while...

  • Page 44

    Model 648 key descriptions magnet water selects the magnet water setup menu. 4.13 internal water selects the internal water setup menu. 4.14 display setup sets the display brightness. 4.6 escape exits from parameter setting sequence without changing the parameter value. Press and hold to reset param...

  • Page 46

    36 chapter 4: operation model 648 electromagnet power supply 4.9 ramp segments the magnetic field produced by electromagnets is not linear with the current setting. The best way to compensate for this is to use closed loop field control, but if absolute accuracy is not necessary, then some of this n...

  • Page 48

    38 chapter 4: operation model 648 electromagnet power supply bring the magnet temperature to equilibrium. The off menu selection can be used to turn it off. D disabled mode: the model 648 assumes that no valve is installed and the line for magnet water status will not be displayed. The magnet water ...

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    40 chapter 4: operation model 648 electromagnet power supply 4.18 computer interface there are two computer interfaces on the model 648, a usb interface and an ieee- 488 interface. These interfaces are used to connect the instrument to a computer for automated control or data taking. Refer to chapte...

  • Page 52

    42 chapter 5: computer interface operation model 648 electromagnet power supply 5.2.1 changing ieee- 488 interface parameters the ieee-488 address must be set from the front panel before communication with the instrument can be established. Menu navigation: interface q enabled q ieee-488 interface q...

  • Page 54

    44 chapter 5: computer interface operation model 648 electromagnet power supply 5.2.4 status system overview the model 648 implements a status system compliant with the ieee-488.2 standard. The status system provides a method of recording and reporting instrument informa- tion and is typically used ...

  • Page 55

    Model 648 status system (image 1 of 2) service request name bit not rqs = service request mss = master summary status bit esb = event status sumary bit mav = message available summary bit osb = operation summary bit oesb = operational error summary bit hesb = hardware error summary bit used 6 comp =...

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    Model 648 status system (image 2 of 2) name name name used not used not 7 6 5 4 3 2 1 0 bit used used erst? Not used 7 not used 6 5 condition register error status 7 not 6 5 not 4 3 2 1 0 bit 4 3 2 1 0 bit dac osp osp osp ocf oov ooc tf oov ocf dac ooc tf oov ocf dac ooc tf and and and and and event...

  • Page 58

    48 chapter 5: computer interface operation model 648 electromagnet power supply 5.2.5.1 standard event status register set the standard event status register reports the following interface related instru- ment events: power on detected, command syntax errors, command execution errors, query errors,...

  • Page 59

    Operation event register to bit 7 (osb) of status byte register (see figure 5-1.) or and used not not not not not opste, used opste? Used used used event enable operation register 7 5 6 4 prlm ramp comp name and 2 3 0 1 and bit used not not used not used register opstr? Operation event 7 not not not...

  • Page 60

    Hardware error status register to bit 2 (hesb) of (see figure 5-1.) status byte register not not event register 5 used used erste, erste? Error status enable register not 7 6 not erstr? Used used name ocf ooc tf oov dac and and 4 2 3 0 1 bit and dac and and oov and tf ooc ocf name or 5 5 6 7 conditi...

  • Page 61

    Operational error status register ref pff name cal th epe mff hlv llv mff mff 5 5 error status enable register erste, erste? 6 7 ref pff ref pff erstr? And and error status erst? Event register 7 6 or and and epe 2 3 4 llv hlv th bit 0 1 cal name and and and cal th epe llv hlv name and 4 2 3 1 0 bit...

  • Page 62

    52 chapter 5: computer interface operation model 648 electromagnet power supply d message available (mav), bit (4): set summary bit indicates that a message is available in the output buffer. D bit (3): not used. D hardware errors summary (hesb), bit (2): set summary bit indicates that an enabled ha...

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    54 chapter 5: computer interface operation model 648 electromagnet power supply the *opc? Query has no interaction with bit 0 (opc) of the standard event status reg- ister. If the *opc? Query is sent at the end of a command sequence, the bus will be held until the instrument completes the operation ...

  • Page 66

    56 chapter 5: computer interface operation model 648 electromagnet power supply for windows vista® and windows 7®: 1. Right click on the file and click extract all. 2. An extract compressed (zipped) folders dialog box will appear. It is recom- mended the default folder is not changed. Take note of t...

  • Page 68

    58 chapter 5: computer interface operation model 648 electromagnet power supply 5.3.4 communication communicating via the usb interface is done using message strings. The message strings should be carefully formulated by the user program according to some simple rules to establish effective message ...

  • Page 70

    Command summary command function page command function page q cls clear interface cmd 61 limit limit output settings cmd 65 q ese event status enable register cmd 61 limit? Limit output settings query 65 q ese? Event status enable register query 61 lock keyboard lock cmd 65 q esr? Standard event sta...

  • Page 72

    62 chapter 5: computer interface operation model 648 electromagnet power supply opc? Operation complete query opc?[term] returned 1[term] remarks has no interaction with bit 0 (opc) of the standard event status register. If sent at the end of a command sequence, the bus will be held until the instru...

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    64 chapter 5: computer interface operation model 648 electromagnet power supply erstr? Error status register query input erstr?[term] returned , [term] format nnn,nnn remarks the integers returned represent the sum of the bit weighting of the error bits. These error bits are latched when an error co...

  • Page 76

    66 chapter 5: computer interface operation model 648 electromagnet power supply mode? Ieee interface mode query input mode?[term] returned [term] format n (refer to command for description) opst? Operational status query input opst? [term] returned [term] format nnn remarks the integer returned repr...

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    68 chapter 5: computer interface operation model 648 electromagnet power supply seti? Output current setting query input seti?[term] returned [term] format ±nnn.Nnn (refer to command for description) stop stop output current ramp command input stop[term] remarks this command will stop the output cur...

  • Page 80

    70 chapter 6: service model 648 electromagnet power supply 6.3 ieee interface troubleshooting this section provides ieee interface troubleshooting for issues that arise with new installations, old installations, and intermittent lockups. 6.3.1 new installation 1. Check the instrument address. 2. Alw...

  • Page 82

    Voltage change detail 72 chapter 6: service model 648 electromagnet power supply 6.6 circuit breaker setting the main three-phase input power is protected by an automatic-reset circuit breaker within the instrument. A smaller, start-up power supply is fused separately and discussed in section 6.7. I...

  • Page 84

    Fuse drawer 74 chapter 6: service model 648 electromagnet power supply 6.8 factory reset menu it is sometimes necessary to reset instrument parameter values or clear the contents of curve memory. Both are stored in nonvolatile memory called novram, but they can be cleared individually. Instrument ca...

  • Page 86

    76 chapter 6: service model 648 electromagnet power supply 6.11 connector and cable definitions all non-power electrical connections to the rear of the model 648 are detailed in this section. 6.11.1 analog i/o connector the analog i/o connector provides the connections for the external programming v...

  • Page 88

    78 chapter 6: service model 648 electromagnet power supply 6.11.4 power supply water connectors this section describes the flow switch and the water control valve. 6.11.4.1 flow switch the flow switch connector provides the means to connect the mandatory water flow switch (closed during flow) to pro...

  • Page 90

    80 chapter 6: service model 648 electromagnet power supply 6.12.2 return of equipment the electromagnet power supply is packaged to protect it during shipment. The user should retain any shipping carton(s) in which equipment is originally received, in the event that any equipment needs to be returne...