Cause : Overspeed occurrence comes when the inverter trips when the motor speed exceeds the Pr.374 Overspeed detection level under encoder feedback control, Real sensorless vector control, vector control, and PM sensorless vector control. This protective function is not available in the initial status.

1. Check that the Pr.374 setting is correct.
2. Check that the number of encoder pulses does not differ from the actual number of Pr 369 Number of encoder pulses (under encoder feedback control or vector control).
3. Set the Pr.374 correctly.
4. Set the Pr 369 correctly (under encoder feedback control or vector control).