272
Diagnostics and Troubleshooting
*Additional information at end of section
Error/Message Alt. /
(NUM)
Description Cause/Solution/Troubleshoot
Error Charge
Relay Fault
ELSF
(15)
Load shunt fault Load-shunt relay has not picked up, occurs for a short
time during the switch-on phase, but would automatically
be reset immediately.
If the error message remains the following causes may
be applicable:
Load-shunt defective - Replace inverter
Input voltage incorrect or too low
Braking resistor connected to wrong terminals or
braking transistor defective (See Appendix on how to
test braking transistor).
Failure of the load shunt could result from excessive
power cycling of the inverter without allowing the unit to
fully power down, which may also be a result of frequent
brown-outs.
Use of a 230V single phase UPS power supply with a
480V drive is permitted and can be accomplished with
the input function UPS Operation to reduce the under
voltage error limit, although if the waveform is not a sine
wave then the DC bus voltage may be less than the
280VDC required to reset the fault. It is suggested to
let the drive power down completely before powering up
with the UPS supply.
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