CFS SERIES OPERATION MANUAL
SECTION 4: TECHNICAL SPECIFICATIONS
Entire Contents Copyright
2016 by Adaptive Power Systems, Inc. (APS) • All Rights Reserved • No reproduction without written authorization from APS.
APS CFS300 Series Power Source Operation Manual
Page 18 of 156
3.5
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 mode 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 CFS300 will fault and open the output relay when
the load current exceeds the set current limit value for some period
of time. This time period depends on the amount of load current. At
current levels slightly above the set value, this time may be fairly
long. At load currents significantly higher than the set current level
– i.e. a short circuit condition - , this period will be very short.
The protection mode selection is available in the System setup menu under “OC Fold”.
Available settings are:
•
OC Fold = ON Enables voltage fold back mode
•
OC Fold = OFF Disables voltage fold back mode