CPS100 SERIES OPERATION MANUAL
SECTION 3: PRODUCT OVERVIEW
Entire Contents Copyright 2018 by Adaptive Power Systems, Inc. (APS) • All Rights Reserved • No reproduction without written authorization from APS.
APS CPS100 Series Power Source Operation Manual Page 20 of 231
Current Protection Modes
Current protection is an important feature on programmable power sources as it allows
protection of the unit under test against damage caused by over current conditions. The
default setting for current limit is the maximum supported value for the voltage range
selected. However, it should be set to a value appropriate for protecting the unit under
test, before applying power. Current limit set values are in Aac RMS for AC current and Adc
for DC mode.
Current protection mode is available using one of two modes of operation:
Current Fold-Back: In this mode, load current is limited to the set current limit value by
reducing the output voltage. Thus, while in fold back mode, the
output voltage will be less than the programmed (set) voltage. As
the load impedance increases and thus the load current decreases,
the voltage will go up until the load current is at or below the
programmed current limit value and the voltage is at the set value.
Current Fault Mode: In this mode, the CPS100 Series will fault and open the output relay
when the load current exceeds the set current limit value for some
period. This period depends on the amount of load current. At
current levels slightly above the set value, this time may be longer.
At load currents significantly higher than the set current level – i.e. a
short circuit condition - this period will be short.
Voltage & Current Output Profiles
The CPS100 Series provides higher load current at lower voltage as long as the total output
power is within its power band. This results in a constant power voltage/current profile as
shown in the following charts for each model by output mode (AC or DC), and voltage range
(high (300Vac/424Vdc) or low (150Vac/212Vdc)).
This provides greater versatility compared to point-rated AC or DC power sources that
provide maximum current and power only at full-scale output voltage.
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