181
Diagnostics and Troubleshooting
*Additional information at end of section
Error/Message Description Cause/Solution/Troubleshoot
EOC
Error Over
Current
(continued)
Meg tests to check motor winding insulation can
only be performed with the motor disconnected
from the inverter. Failure to do so will result in
damage to the output section of the inverter due to
high voltage from the meg tester.
The inverter can be operated in open loop induction
mode without being connected to the motor:
Power off and after appropriate discharge time,
disconnect the motor leads from the inverter.
If not an induction motor, change motor
con guration to induction motor in US10 (if US10
was previously set to a PM synchronous motor,
performing this step will erase and default all
parameters; make note of settings as needed
before continuing), then Write Con guration to
Drive in US04. Program drive as needed from
default for the drive to output current when given
an inspection run command.
Set to LF.30 Control Mode = Open Loop V/Hz
Run the system with the motor leads disconnected
in open-loop. If the over current error occurs, then
the inverter output is faulty. If an overcurrent error
does not occur, then the fault may be in the motor,
motor cabling or motor contactor.
Notes:
Under normal operation, the drive would limit the output
to the current corresponding to the maximum torque
in 0.LF36. Maximum Output Current = LF.12 Motor
Current x 0.LF.36 Maximum Torque / LF.17 Motor Torque.
The drive would also limit the output current to the
hardware current limit, listed as the Peak Current
(30sec.) rating in the Technical Data tables in Sec.2.1
and 2.2. The Peak Current rating will be less than the
overcurrent.
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