Cause : Overcurrent trip during acceleration comes when the inverter output current reaches or exceeds approximately 220% of the rated current during acceleration, the protective circuit is activated to stop the inverter output.

1. Check for sudden speed acceleration.
2. Check if the downward acceleration time is too long in a lift application.
3. Check for output short-circuit.
4. Check that the Pr.3 Base frequency setting is not 60 Hz when the motor rated frequency is 50 Hz.
5. Check if the stall prevention operation level is set too high. Check if the fast-response current limit operation is disabled.
6. Check that the regenerative driving is not performed frequently. (Check if the output voltage becomes larger than the V/F reference voltage at regenerative driving and overcurrent occurs due to increase in the motor current.)
7. Check that the power supply for RS-485 terminal is not shorted (under vector control).
8. Check that the encoder wiring and the specifications (encoder power supply, resolution, differential/ complementary) are correct.
9. Check also that the motor wiring (U, V, W) is correct (under vector control).
10. Check that the rotation direction is not switched from forward to reverse rotation (or from reverse to forward) during torque control under Real sensorless vector control.
11. Check that the inverter capacity matches with the motor capacity. (PM sensorless vector control)
12. Check if a start command is given to the inverter while the motor is coasting. (PM sensorless vector control)