187
Diagnostics and Troubleshooting
*Additional information at end of section
Error/Message Description Cause/Solution/Troubleshoot
E.OP
Error Over
Voltage
(continued)
Measure DC bus directly and verify against DC bus
voltage read from the Diagnostics screen. The DC
bus should be approximately 1.41xAC Input phase-to-
phase.
If a braking resistor is used and there is an issue with
the braking transistor:
If there is an issue due to high frequency noise:
Verify proper mains grounding.
E.PU
Error Power
Unit
General power
circuit fault
Inverter must be inspected and repaired by KEB or
replaced.
E.PUCH
Error Power
Unit Changed
The control card
recognizes a new
power stage (the
control card was
changed).
This error should automatically clear itself.
E.PUCI
Error Power
Unit Invalid
During the
initialization the
power circuit could
not be recognized
or was identi ed
as invalid
This error could occur from noise.
Disconnect terminal strip, encoder cable and serial
comm. (if used) and power cycle the drive.
Check phase-to-phase and phase-to-ground line
voltages to make sure they are balanced and not
causing noise.
Re-seat ribbon connecting control card to power stage.
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