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What are possible causes for over braking faults OBF in the ATV61 or ATV71 drives?
Braking too sudden or driving load
If the drive trips while running, monitor for voltage surges and spikes, you may need to install a line reactor or a surge suppressor.
If the drive is tripping while decelerating, increase deceleration time. You may need to add a Dynamic Braking resistor.
If the drive trips on a Start command, check to see that the Catch on the Fly parameter is enabled in the Fault Management menu (if application allows). Also verify wiring between drive and motor as well as motor connections.