oc on DELTA inverters: Output over-current

DELTA inverters: VFD-EL

Disconnect the supply and wait for the capacitors to discharge before opening the inverter or touching its terminals.

Common causes

1. 1Short circuit in the motor cable or winding
2. 2Acceleration or deceleration time too short
3. 3Drive rating smaller than the motor or load
4. 4Jammed or suddenly heavy mechanical load
5. 5A contactor switching betwe

Try first

1. 1Disconnect U, V, W and run the drive without the motor: if the fault clears, check the cable and motor
2. 2Megger the motor and cable insulation
3. 3Increase Pr.01-09 (accel) and Pr.01-10 (decel)
4. 4Check the dr