Over-current during acceleration (ocA)

Output current exceeds 2.4 times of rated current during acceleration. When ocA occurs, the drive closes the gate of the output immediately, the motor runs freely, and the display shows an ocA error.

Acceleration time is too short

1. Increase the acceleration time
2. Increase the acceleration time of S curve
3. Set auto-acceleration and auto-deceleration parameter (Pr.01-44)
4. Set over-current stall prevention function (Pr.06-03)
5. Replace the drive with a larger capacity model.

The load is too large - Check if the output current during the whole working process exceeds the AC motor drive’s rated current. If yes, replace the AC motor drive with a larger capacity model.

The ocA occurs due to short circuit or ground fault at the output side of the drive. Check for possible short circuits between terminals with the electric meter: B1 corresponds to U, V, W; DC- corresponds to U, V, W; corresponds to U, V, W.

Check drive rectifier & IGBT using multimeter.
Check wiring.
Check drive hardware using multimeter.