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Chapter 4:
Troubleshooting Procedures
4.1
Indication of OC.OL
When inverter display
malfunction indication
OC.OL.
Switch ON power
supply
Is the output frequency
displayed?
YES
Is the primary
circuit I.G.B.T.
normal?
Input operation
instruction
Replace I.G.B.T.
Is the current
detector normal?
NO
YES
NO
ABNORMAL
Is there any
malfunction indication
Input frequency setting
Is there output
voltage on UVW
terminals?
Connect motor and
proceed with operation.
Is there any malfunction
indication
Is output
current of all phases in
balance condition.
Inverter is out of order. Detail
examination is required.
Contact Drivecon for further
instructions.
The inverter is
normal now.
Replace defective PCB
Replace control board.
Replace detector.
Replace control board
Replace control board
Is replacing
control board correct this
Problem?
ABNORMAL
NORMAL
NO
YES
YES
NO
NO
YES
YES
NO
Is PCB
appearance
normal?
NO
YES