Overcurrent During Acceleration

What does E.OC1 mean?

When the inverter's output current rapidly increases to approximately 230% of the rated current during the acceleration phase, the internal protection circuit is triggered, leading to an immediate shutdown of the inverter output. This can indicate excessive load, improper acceleration settings, or an output short-circuit condition. Left unaddressed, this can cause repeated trips, motor damage, or inverter component stress.

Complete Troubleshooting Guide

1. 1

   Increase the acceleration time (Pr.0 to Pr.2, Pr.4 to Pr.8) to reduce current demand; for lift applications, shorten downward acceleration time.

2. 2

   Check for output short circuits by inspecting motor wiring and connections. If fault persists, disconnect the motor and re-test the inverter; contact support if it still appears.

3. 3

   Verify the motor and inverter capacities are matched and adjust Pr.3 (Base frequency) if needed (e.g., 50Hz for 50Hz motor).

4. 4

   Lower the stall prevention operation level or activate the fast-response current limit function.

5. 5

   Confirm encoder and motor wiring/specifications are correct, especially when using Vector control.