Specifications

Output current and voltage
Model 665: ±100 A, ±50 V (5 kW)
Model 668: ±135 A, ±65 V (8.8 kW)

Ramp rate: up to 10 A/s

Load: resistive electromagnet or any equivalent resistive load; supplies are compensated for typical electromagnets—highly inductive loads may require tuning in the field

Nominal load
Model 665: 0.5 Ω
Model 668: 0.5 Ω

Minimum load (consult Lake Shore for other magnet load requirements)
Model 665: 0.25 Ω
Model 668: 0.35 Ω

Output current stability: ±(0.01% of reading + 0.01% of full scale range) under conditions of constant line voltage, load, and temperature

Output noise: ±(0.001% of reading + 0.001% of full scale range) peak to peak, between 0.01 Hz and 1 Hz

Voltage ripple: 5 mV RMS + 0.01% of full scale range

Output settings: Current setpoint, current limit, and voltage limit

Output programming: Local via two 10-turn potentiometers (100%, 1%); remote via ±10 V programming input (BR2 connector)

Output displays: Current and voltage outputs displayed with digital resolution of ≥0.1 A

Output voltage monitor: ±10 V full scale (BR2 connector)

Output current monitor: ±10 V full scale (BR2 connector)

Current output connections: 9.5 mm threaded studs with nuts

On/off control: Front panel separate on, off, and reset push buttons; remote on/off capable

Power supply fault detection circuitry

  • Transistor fault detect
  • Slew rate limit protection
  • Internal condensation protection
  • Overheat protection
  • Overpower protection
  • Overload protection
  • External interlocks

Input power

Model 665:
(7.6 kVA max)
21 A/phase with 208/220 VAC between phases
11 A/phase with 380/400 VAC between phases

Model 668:
(15.5 kVA max)
39 A/phase with 208 VAC between phases
19 A/phase with 400 VAC between phases

Custom voltage configurations are available

50 to 60 Hz; 3-phase plus ground (four wire)
Line voltage must be specified at time of order. Cable from power supply to facility power not included

Cooling water requirements (minimum at 0.5 Ω nominal load)

Model 665:
flow rate: 8 L/min (2.1 gal/min)
pressure drop: 0.12 MPa (17 psi)

Model 668:
flow rate: 8 L/min (2.1 gal/min)
pressure drop: 0.14 MPa (20 psi)

Cooling water connections

Model 665 and 668: ¼-inch NPT female thread; ¼-inch NPT male to 10 mm (~3/8 in) hose barb included

Operating environment

Ambient temperature: +10 ºC to +30 ºC (50 ºF to 86 ºF)
Humidity: 55% ±10% (non-condensing)
Cooling water: +15 ºC to +25 ºC (59 ºF to 77 ºF)
CAUTION: Internal condensation can cause damage to the power supply.

Mechanical outline: Free standing rack cabinet with locking wheels and 4 lifting eye bolts

Size and weight

Model 665: 135 cm high × 70 cm deep × 60 cm wide
(53.1 in × 27.6 in × 23.6 in); 250 kG (550 lb)
Model 668: 135 cm high × 70 cm deep × 60 cm wide
(53.1 in × 27.6 in × 23.6 in); 354 kG (780 lb)

Shipping Size and weight

Model 665: 152 cm × 84 cm × 76 cm (60 in × 33 in × 30 in);
295 kg (650 lb)
Model 668: 178 cm × 91 cm × 76 cm (70 in × 36 in × 30 in);
400 kg (880 lb)