KEB COMBIVERT F5 Operation Manual page 90

Drive Faults
Error/Message Alt.
(NUM)
Error Charge ELSF
Relay Fault (15)
90
/ Description
Load shunt fault
Cause/Solution/Troubleshoot
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 brak-
ing 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.