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The Model 642 electromagnet power supply is obsolete and has been replaced by the new Model 643 electromagnet power supply.

Specifications

Output
Type
Bipolar, 4-quadrant, DC current source
Current generation

Fully linear regulation with digital setting and analog control
Current range
±70 A
Compliance
voltage (DC)
±35 V nominal
Power
2450 W nominal
Load resistance range
0.4 Ω to 0.6 Ω
Load inductance range
0 to 1 H
Nominal load
0.5 Ω, 0.5 H
Current ripple
5 mA RMS (0.007%) at 70 A into nominal load
Current ripple frequency
Dominated by the line frequency and its harmonics
Temperature coefficient
±15 ppm of full scale/°C
Line regulation
±60 ppm of full scale/10% line change
Stability (1 h)
1 mA/h (after warm-up)
Stability (24 h)

5 mA/24 h (typical, dominated by temp. coefficient and line regulation)
Isolation

Differential output is optically isolated from chassis to prevent ground loops
Slew rate

50 A/s into nominal load , 650 A/s minimum into a resistive load
Compliance voltage (AC)
±43 V nominal
Setting time

<1 s for 10% step to within 1 mA of output into nominal load
Modulation response


=0.17 Hz at ±70 A sine wave into nominal load, <0.02% THD; =10 Hz at ±10 A sine wave into nominal load, <0.10% THD
Attenuation
-0.5 dB at 10 Hz
Protection


Short circuit, line loss, low line voltage, high line voltage, output over voltage, output over current, and over temperature
Connector Two lugs with 6.4 mm (0.25 in) holes for M6 or 0.25 in bolts
Output Programming
Internal current setting
   Resolution 0.1 mA (20-bit)
   Settling time 600 ms for 1% step to within 1 mA (of internal setting)
   Accuracy ±10 mA ±0.05% of setting
   Operation Keypad, computer interface
   Protection
Programmable current setting limit
Internal current ramp
  Ramp rate 0.1 mA/s to 99.999 A/s (complaince limited)
   Update rate
23.7 increments/s
   Ramp segments 5
   Operation Keypad, computer interface
   Protection
Programmable ramp rate limit
External current programming
   Sensitivity 10 V/70 A
   Resolution Analog
   Accuracy
±10 mA ±1% of setting
   Input resistance 20 kΩ
   Operation Voltage program through rear panel, can be summed with internal current setting
   Limits Internally clamped at ±10.1 V and bandwidth limited at 40 Hz to protect output
   Connector Shared 15-pin D-sub
Readings
Output current
  Resolution 0.1 mA
   Accuracy ±5 mA ±0.05% of reading
   Update rate
2.5 rdg/s display, 10 rdgs/s interface
Output voltage (at supply terminals)
  Resolution 1 mV
   Accuracy
±5 mV ±0.05% of rdg
   Update rate 2.5 rdg/s display, 5 rdg/s interface
Front Panel
Display type
8-line by 40-character, graphic vacuum fluorescent module
Display readings
Output current, output voltage, and internal water temperature
Display settings
Output current and ramp rate
Display annunciators
Status and errors
LED annunciators
Fault, Compliance, Power Limit, Ramping, Remote
Audible annunciator
Errors and faults
Keypad type 26 full-travel keys
Keypad functions
Direct access to common operations, menu driven setup
Power White flush ON and black extended OFF push buttons
Interface
IEEE-488.2 interface
 
   Features SH1, AH1, T5, L4, SR1, RL1, PP0, DC1, DT0, C0, E1
   Reading rate To 10 rdg/s
   Software support National Instruments LabVIEW™ driver
(consult Lake Shore for availability)
Serial interface
   Electrical format RS-232C
   Baud rates
9600, 19200, 38400, 57600
   Reading rate To 10 rdg/s
   Connector
9-pin D-sub (DTE)
Output current monitor
   Sensitivity 7 V = 10 A
   Accuracy ±1% of full scale
   Noise
1 mV RMS
   Source impedence 20 Ω
   Connector
Shared 15-pin D-sub
Output voltage monitor
   Sensitivity 3.5 V = 35 V
   Accuracy 1% of full scale
   Noise 1 mV RMS
   Source impedence 20 Ω
   Connector
Shared 15-pin D-sub
Power supply cooling water
 
   Remote enable input TTL low or contact closure to enable output; jumper required if unused
   Valve power output 24 VAC at 1 A maximum, automatic or manual control
   Connector
Shared 4-pin detachable terminal block
   Flow switch and water valve optional
Magnet cooling water
   Remote enable input TTL low or contact closure to enable output; jumper required if unused
   Valve power output 24 VAC at 1 A maximum, automatic or manual control
   Connector
Shared 4-pin detachable terminal block
   Flow switch and water valve optional
Auxiliary
   Emergency stop Requires 1 A, 24 VAC normally closed contact closure to enable power-up; jumper required if unused
   Fault output
Relay with normally open or normally closed contact, 30 VDC at 1 A
   Remote enable input TTL low or contact closure to enable output; jumper required if unused
   Connector
Shared 8-pin detachable terminal block
Emergency stop and inhibit switches not included
General
Input power
   Power 5500 VA max
   Voltage & current 204/208 VAC ±10%, 13 A/phase; 220/230 VAC ±10%, 12 A/phase; 380 VAC ±10%, 7 A/phase; 400/415 VAC ±10%, 6.5 A/phase
   Protection 3-phase thermal relay with adjustable current setting. Two class CC ¼ A fuses. Over-voltage lockout circuit.
   Frequency 50 or 60 Hz
   Configuration 3-phase delta
   Connector
4-pin terminal block
Line voltage must be specified at time of order but is field reconfigurable; cable from power supply to facility power not included
Cooling water
 
   Flow rate 5.7 L (1.5 gal) per min minimum
   Pressure range
34 kPa (5 PSI) to 552 kPa (80 PSI)
   Pressure drop 10 kPa (1.5 PSI) at 5.7 L (1.5 gal) per min minimum for power supply only
   Temperature 15 °C to 30 °C (non condensing)
   Connection
Two 10 mm (0.375 in) hose barbs
CAUTION: Internal condensation can cause damage to the power supply
Enclosure type


7 U High, 19 in rack mount with integral rack mount ears, 25 mm (1 in) air space required on each side for ventilation
Size

48.3 cm W × 31.0 cm H × 57.2 cm D (19 in × 12.2 in × 22.5 in) with handles removed
Weight
74 kg (163 lb)
Shipping size

63.5 cm W × 55.9 cm H × 73.7 cm D (25 in × 22 in × 29 in)
Shipping weight
80 kg (175 lb)
Ambient temperature

15 °C to 35 °C at rated accuracy, 5 °C to 40 °C at reduced accuracy
Humidity

80% to 31 °C decreasing linearly to 50% at 40 °C, (non condensing)
Warm-up
30 min at output current setting
Approvals

CE mark–low voltage compliance to EN61010-3, EMC compliance to EN55022-1
Calibration schedule 1 year