How to fix oc3 fault in fuji drive?

An OC3 fault on a Fuji (Fuji Electric) VFD usually means overcurrent during deceleration. This often happens when the deceleration time is too short and the motor can’t slow down smoothly. Increasing the deceleration time parameter is the first thing to try.

Another common cause is mechanical load issues—like a jammed motor sudden load change or incorrect motor parameters. Double-check motor ratings wiring and ensure the drive’s motor settings match the actual motor.

If the fault keeps coming back adding a braking resistor or enabling dynamic braking (if supported) usually solves it. Fuji Electric’s manuals are very detailed on OC faults and parameters: https://www.fujielectric.com/.