Ametek Amrel PLA Series Operation Manual page 22

User-Defined Over Current, Voltage, and Power Protection:
Over Voltage (OVP):
OVP is a programmable voltage trip point. Limits can be programmed to "shut down" the electronic load input if the
voltage exceeds pre-programmed value (default to off). The default programmable over voltage (OVP) trip point is 105%
of full voltage rating
Over Current (OCP):
Over Current Protection (OCP) is a programmable current trip point. Limits can be programmed to "shut down" the
electronic load input if the current exceeds pre-programmed value for longer than the pre-set time interval (default to off).
The default programmable over current (OCP) trip point is 105% of full current rating.
Overpower (OPP):
The overpower protection (OPP) is a programmable power trip point. If the input power exceeds the overpower limit, the
electronic load input will shut down and display an OPP alarm message. The default programmable overpower trip point
is 110% of full power rating for PLW Models and 105% of full power rating for PLA Models.
User-Defined Under Current, Voltage, and Power Protection
For flexible customer application, AMETEK's electronic load provides a user-defined under current (UCP), under voltage
(UVP) and under power protection (UPP). If there are any applications that require a minimum voltage, current or power
level for normal operation, the system will shut down when the level drops below the set value.
Custom Max/Min Value Setting
The maximum and minimum value for each mode and range is programmable.
Note: The max and min value settings must be within the limits of each individual range and mode
Low Voltage (LV) Protection
When the input voltage drops below 1.5% of the maximum voltage, a "LV" message will appear to indicate the electronic
load is operating under a low voltage condition. During "LV" mode, the load will automatically switch to a slower slew
time to soften high in-rush currents by limiting the speed of the current rise. The "LV" message notifies the user of a
change in the slew time, so they can modify their settings to ensure proper test operation.
Self-Diagnostic Capability
Based on the system error message displayed on the front panel, certain troubleshooting analysis can be concluded and
may be fixed accordingly. The error messages or alarms displayed due to "over limit" faults or erroneous operation will
trigger an internal relay that shuts off the system input. For more serious failures, such as "VPP", "VNP" or "INF," the
system has permanently shut down and will need to be shipped back to AMETEK for repair as there are other faults.
M470039-01 REV-F Page 21