AMETEK PLA-PLW - Manual (Page 19)

In Fault Protection (INF)
If the eLOAD is forced to sustain too much power, current or voltage in a short amount of time, the internal
power stage may have been damaged. If the damage is serious enough, the system hardware will shutdown
and the display will show an “In_Fault” error message. When this message occurs, please contact
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customer service. The eLOAD most likely has a power stage malfunction and will no longer operate normally.
Note: For INF failure, please refrain from repairing the unit, for it may inflict further damage.
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 eLOAD 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 eLOAD 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.
Over Power (OPP):
The over power protection (OPP) is a programmable power trip point. If the input power exceeds the OPP limit,
the eLOAD input will shutdown and display an OPP alarm message. The default programmable over power
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, AMREL’s eLOAD provides a user-defined under current (UCP), under
voltage (UVP) and under power protection (UPP). For applications that require a minimum voltage, current or
power level for normal operation, the input will shut off 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. To prevent accidental
erroneous settings, the Max/Min will limit the programmable values.
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% of the maximum voltage, a “LV” message will appear to indicate the
eLOAD 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 shutdown and will need to be shipped back to
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for repair. There are other fault protections that could occur under different applications, for an in-
depth analysis of the system errors, please refer to the protection features section. The eLOAD also provides
error bit for the different types of error. Utilizing any of the interfaces, the fault condition can be diagnosed
based on the returned error bit.
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