Overcurrent trip during acceleration

What does E.OC1 mean?

This fault occurs when the inverter's output current reaches or exceeds approximately 200% of the rated current during the acceleration phase. This indicates an excessive load, a short circuit, or incorrect parameter settings, causing the protective circuit to trip. Repeated overcurrent events can lead to overheating and potential damage to the inverter's power components or the connected motor.

Complete Troubleshooting Guide

1. 1

   Increase the acceleration time (e.g., Pr. 7 or Pr. 8) to reduce peak current demands during motor startup. For vertical lift applications, shorten the downward acceleration time.

2. 2

   Inspect the motor and output wiring for any signs of short circuits or ground faults. Disconnect the motor and test the inverter if the fault persists at start-up to isolate the problem.

3. 3

   Verify the motor's rated frequency and ensure Pr. 3 (Base frequency) and Pr. 19 (Base frequency voltage) are set correctly, especially if operating a 50Hz motor on a 60Hz default setting.

4. 4

   Adjust stall prevention operation parameters (e.g., Pr. 156, Pr. 157) to ensure they are appropriate for the specific load conditions.