180
Diagnostics and Troubleshooting
*Additional information at end of section
Error/Message Description Cause/Solution/Troubleshoot
E.OC
Error Over
Current
Occurs when the
speci ed peak
output current is
exceeded or if
there is a ground
fault.
The current and peak current may be viewed in LF.93
and LF.94. To reset the logged peak value, press enter
Causes for over current errors:
If the error occurs instantly at the start of each run, the
issue may be:
Ground fault on motor leads.
Damaged or slow to close motor contactor.
Shorted output transistor.
Motor failure.
If the error is intermittent, the issue may be due to:
Damaged or slow to close motor contactor.
Loose motor connections.
Electrical noise, faulty grounding.
To determine if the over current is caused by the
inverter, motor, or intermediate component (e.g. motor
contactor), systematically remove these items from the
system.
Start by bypassing the motor contactor (do not simply
jumper !).
Checking of the motor and motor cables for short
circuits or opens:
Resistance checks should be done with the motor
disconnected from the inverter. With the motor
cable disconnected from the inverter, make a
resistance check from phase to phase. This should
read the winding resistance, as speci ed by the
motor manufacture. Phase to ground resistance
should read an open circuit. If measurements
indicate a fault, disconnected cables at motor side
and remake the test to determine if the fault is with
the motor or cabling.
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