Overcurrent Trip During Acceleration

What does E.OC1 mean?

An excessive current condition has been detected while the inverter is accelerating the motor. This can be caused by an abnormally high load, a short circuit between phases, or a ground fault on the inverter's output side, potentially leading to damage if not resolved.

Complete Troubleshooting Guide

1. 1

   Increase the acceleration time setting in the inverter parameters to reduce current spikes. For vertical lift applications, consider shortening the downward acceleration time.

2. 2

   Disconnect the motor from the inverter and restart the inverter; if E.OC1 still appears, the inverter itself may be faulty. Contact your sales representative.

3. 3

   Thoroughly inspect all output wiring (U, V, W) for any short circuits between phases or ground faults to the motor or frame.

4. 4

   Verify that Pr. 3 Base frequency is correctly set to match the rated motor frequency (e.g., 50Hz for a 50Hz motor).

5. 5

   Adjust the stall prevention operation level or enable the fast-response current limit operation (Pr.156) to better manage motor load during acceleration.