
Chapter 5 Trouble shooting and maintenance
5-9
Troubleshooting for OC, OL error displays
Is the main circuit
I.G.B.T. working
properly?
Any
abnormalities in
appearances?
Any abnormal
indications?
Replace the current sense
circuit
The inverter displays OC, OL errors
Apply the power
Input operation commands
Replace I.G.B.T
Replace faulty circuit boards
Is the current
detector OK?
Replace the control board
Replace the control board
NO
NO
YES
YES
Input frequency command.
Is the output frequency
of the operating unit
displayed?
Are there voltage
outputs at T1, T2, and
T3 output terminals?
Connect the motor to run.
Any abnormal
values displayed?
Are output
currents of each
phase even?
The inverter’s output is OK
Replace the control board
Replace the control board
Is the control board
working well after
replacement?
Perform detailed checks
The inverter faults
YES
YES
YES
YES
NO
NO
NO
NO
NO
YES
•
YES
YES
Yes
No
No
The output frequency
of the operating unit
display continue
shinning or display SP1
N
o
Yes
Содержание 7300EV
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