Lakeshore Learning Materials 622 - Manual (Page 12)

Lake Shore Model 620/622/623/647 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
as a source or a sink in either polarity in current or voltage mode. Program current and compliance voltage via
the front panel, remote interfaces, or analog input. See Table 1-1 for DC Output Specifications.
Model 620
Model 622 Model 623: Model 647
Current: 0 to ±50 A Current: 0 to ±125 A Current: 0 to ±155 A Current: 0 to ±72 A
Voltage: 0 to ±5 V Voltage: 0 to ±30 V Voltage: 0 to ±30 V Voltage: 0 to ±32 V
Max Power: 250 VA contin. Max Power: 1 kVA contin. Max Power: 1 kVA contin. Max Power: 2 kVA contin.
Remote Sensing: Corrects for load lead drop of up to 0.5 V per lead. Operation with more drop per load lead
is possible with a degradation of the load effect specification.
Output Terminals: The two rear panel output bus bars are isolated from the chassis (earth) ground.
Multiple Unit Operation: Connect up to four units in an auto-parallel configuration for increased output
current capability.
Protection: Front panel annunciators, an audio indicator, and a contact closure indicate faults.
Remote Inhibit (RI): An active RI forces output settings to 0 A and 1 V until the RI is no longer active. To
continue normal operation, enter new output settings.
Output Inhibit (OI): Press the front panel OI key to force output settings to 0 A and 1 V. To continue normal
operation, enter new output settings.
Output Current Step Limit: The output current settings are forced to 0 A and 1 V if a preset current step limit
is exceeded. A key entry is required to continue operation.
Utility Low Line or Loss: Maintains operation until load is discharged or utility is restored.
Utility High Line: Turns off input and maintains operation until load is discharged.
Overvoltage: Crowbars output when output terminal voltage, induced by the load exceeds ±40 VDC.
Overtemperature: Crowbars output and turns off input when internal heat sink temperature exceeds 95 °C.
AC Input: Models 620/622/623 are factory set for operation from 100, 120, 200/208, 220, or 240 VAC
(–10%, +5%) 50 to 60 Hz single phase. Model 647 is factory set for operation from 200/208, 220, or 240 VAC
(–10%, +5%) 50 to 60 Hz single phase.
Input Protection: A front panel 20 A two-pole circuit breaker protects the AC input. The MPS turns off the
breaker in the event of a fault.
Remote Interfaces: Serial Interface is standard; IEEE-488 is optional. All front panel functions can be
controlled over the interfaces. In addition, interfaces output displayed quantities.
Input Current:
Table 1-1. Model 620/622/623 Input Current
Nominal Line
Voltage (VAC)
Line Voltage
Range (VAC)
Maximum Input
Current (A rms)
100 90 to 105 18
120 108 to 126 15
200/208 180 to 218 9
220 198 to 231 8
240 216 to 252 7
Table 1-2. Model 647 Input Current
Nominal Line
Voltage (VAC)
Line Voltage
Range (VAC)
Maximum Input
Current (A rms)
200 180 to 210 16
208 188 to 218 15
220 198 to 231 14
240 216 to 250 13