KEB COMBIVERT F5, Справочное руководство, Страница: 279 / 349

279
Diagnostics and Troubleshooting
*Additional information at end of section
Error/Message Alt. /
(NUM)
Description Cause/Solution/Troubleshoot
Error Over
Current
(continued) EOC
(4) 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
configuration to induction motor in US03 (if US03
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 Configuration to Drive in
US05. Program drive as needed from default for the
drive to output current when given an inspection run
command.
Set to LC01 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.
If the over current error stays with the inverter, then
one of the outputs may be shorted. See Appendix for
diode check measurements of inputs and outputs.
Notes:
Under normal operation, the drive would limit the output
to the current corresponding to the maximum torque in
LC30. Maximum Output Current = LC03 Motor Current x
LC30 Maximum 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.2.4
and 2.5. The Peak Current rating will be less than the
overcurrent.