3 | P a g e
The following subsections provide environmental, electrical, and physical characteristics for the SPS MEDIUM POWER
Series power supplies.
ENVIRONMENTAL CHARACTERISTICS
PARAMETER SPECIFICATION
TEMPERATURE COEFFICIENT
0.02%/°C of maximum output voltage rating for voltage set point. 0.03%/°C of
maximum output current rating for current set point.
AMBIENT TEMPERATURES
Operating 0 to 50°C
Storage -25° to 65°C
COOLING
Internal fans; vents on sides and rear. (Units may be stacked without clearance
above or below).
HUMIDITY
95% maximum, non-condensing, 0 to 50°C; 45°C maximum wet-bulb
temperature
ALTITUDE
Operating full power available up to 5,000 feet (1,524m), derate 10% of full
power for every 1,000 feet higher; non-operating to 40,000 feet (12,192m)
OZONE CONCENTRATION
Recommended long-term exposure limit is 0.1 PPM (0.2 mg/m3).
ELECTRICAL CHARACTERISTICS
PARAMETER SPECIFICATION
INPUT POWER
Voltage (Standard) 208/220 VAC±10% (allowed range 187-242 VAC)
Voltage (Options)
380/400 VAC±10% (allowed range 342-440 VAC) 440/480 VAC±10%
(allowed range 396-528 VAC)
Frequency 47 to 63 Hz
Phases 3–phase, 3–wire plus ground. Not phase rotation sensitive. Neutral not used.
Power Factor
0.9 typical for 208/220VAC input0.78 typical for 380/400VAC input0.7 typical
for 440/480VAC input
Efficiency 87% typical at full load, nominal line
FRONT PANEL METER ACCURACY
Voltage ±0.15% of full-scale
Current ±0.4% of full-scale
LOAD REGULATION
(Specified at no load to full load, nominal AC input)
Voltage 0.02% of maximum output voltage
Current 0.1% of maximum output current
LINE REGULATION
(Specified ±10% of nominal AC input, constant load)
Voltage 0.01% of maximum output voltage
Current 0.05% of maximum output current
TRANSIENT RESPONSE
A 50% step load will recover to within 0.75% of original value within 1 ms.
DOWN PROGRAMMING
With no load the output will program from 100 to 10% in less than 1.5
seconds
STABILITY
±0.05% of set point after 8–hr. warm-up at fixed line, load, and temperature
using remote sense
REMOTE CONTROL/MONITOR
On/Off control via contact closure, 6-120 VDC or 12-240 VAC, and TTL or
CMOS switch, output voltage and current monitor, OVP limit set, summary
fault status
PARAMETER SPECIFICATION
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