Mitsubishi FR-D700 Series, FR-CS80 Series & FR-XC Series Drive
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Apr 02, 2024 11:51 am
Cause : Overcurrent trip during acceleration comes when the inverter output current reaches or exceeds approximately 200% of the rated current during acceleration, the protection circuit is activated and the inverter output is shut off.
- Check for sudden speed acceleration.
- Check if the downward acceleration time is too long in a lift application.
- Check for output short-circuit.
- Check that the Pr.3 Base frequency setting is not 60 Hz when the motor rated frequency is 50 Hz.
- Check if the stall prevention operation level is set too high. Check if the fast-response current limit operation is disabled.
- 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.)
- Check that the encoder wiring and the specifications (encoder power supply, resolution, differential/ complementary) are correct.
- Check also that the motor wiring (U, V, W) is correct (under vector control).
- 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.
- Check that the inverter capacity matches with the motor capacity.
- Check if a start command is given to the inverter while the motor is coasting.