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OPF1 fault on an ATV61 or ATV71 drive.
Altivar ATV61 and ATV71
All ATV61 and ATV71 drives
1 phase loss between the drive and motor.
This fault is triggered when the drive detects one of the motor phases has been lost (or has very low current) for more than 500 msec.
Check the connection between the drive and motor.