Frequently asked questions
What can cause an OCL short circuit fault on the ATV21 or ATV212 drives?
28 September 2021Issue:
OCL fault on the ATV21/ATV212 drives
Altivar ATV21 and ATV212 including the S-Flex enclosed drives.
The ATV212 drive is tripping on OCL fault when they try and run the motor.
OCL means phase to phase output short circuit. The motor impedance to ground is low.
Try dropping the motor leads and meggering out the motor with a 1kv meggering if the motor checks out ok
If you need to run the drive open circuit without the motor connected:
Turn off the Drive and wait until the DC bus caps have discharged.
Turn off OPL ( F605) , set to 0 then set up F307 to 2
Now with the motor disconnected you can run the VFD open circuit at 20 40 and 60hz. Check your output voltage at each stage.