N3 OC and OL errors
Replace IGBT modules
No
Apply power
No
Yes
Is the Fwd LED on ?
Yes
The inverter is faulty.
Perform a detailed check.
Yes
Inverter is functioning normally
No
Fig. 22.2 OC and OL Error Troubleshooting
Are the IGTB modules
functioning ?
Replace control board
Yes
Is there motor output voltage at
terminals U, V & W ?
Input frequency command
No
Yes
Does the inverter function
normally after replacement
?
Yes
Any faults displayed ?
Are there any visual
abnormalties ?
Replace faulty parts
Are there any
abnormal indications ?
Input operational command
Yes
Are the current
detectors ok ?
Replace current controller
Yes
No
No
Replace control board
Is the output frequency displayed
on the digital operator ?
Yes
Replace control board
No
No
Replace control board
Connect the motor and run
Yes
Are the current
detectors ok ?
No
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