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Error handling of malfunction indication of OC.OL
When inverter display
malfunction indication
OC.OL.
Is the primary
ABNORMAL
circuit I.G.B.T.
normal?
NORMAL
Is the appearance
normal?
Switch ON power
supply
Is there any
malfunction indication
NO
Input operation
instruction
YES
Input frequency setting
NO
Is the output frequency
displayed?
YES
Is there output
NO
voltage on UVW
terminals?
YES
Connect motor and
proceed with operation.
YES
Is there any malfunction
indication
NO
Is output
NO
current of all phases in
balance condition.
YES
The inverter is
normal now.
Replace I.G.B.T.
Replace defective PCB
YES
YES
Replace control board
Replace control board
37
Is the current
ABNORMAL
detector normal?
NORMAL
Replace control board.
Is replacing
control board correct this
Problem?
Inverter is out of order.
Detail examination is required.
Replace detector.
NO
YES
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