OBF Fault on ATV61 and ATV71 | Schneider Electric Support

If it reaches the voltage trip threshold while the VFD is in running status, the VFD faults OBF. There are multiple causes to a high DC Bus voltage.

If the drive trips at starting:
Check that the Catch on the Fly parameter is enabled in the Fault Management menu (if application allows)

Review the power circuit for sources of a power disturbance. These are typically poor electrical connections at breaker/contactor contacts, wire terminations, fuse clips.

Consider arcing within windings of a transformer, line/load reactor, and motor.

Measure line voltage on the drive L1,L2,L3 terminals (phase to phase) and check for any high voltage.

Check mains voltage reading in the 1.2 Monitoring menu to see what the drive is seeing coming in.

Measure DC bus voltage to see if it's too high. Should be approximately 1.41 times the line voltage.

Consider adjusting acceleration time up or down.

Connect with Schneider Electric:

[MuhammadZubair-vnzo]

Hi in my VFD all Running time show this fault obf fault no time limit ...all parameters checked found normal.load normal .no used break Resisters. And DC bus threshold voltage found normal .
Motor Rating power .1.5 kw
Motor Rated current. 3, 5 amp
Hz . 50 Hz
Voltage.400