Cause : Overacceleration Detection comes when the acceleration of the elevator car exceeds the overacceleration detection level (S6-10).

1. The encoder offset (E5-11) is incorrect. Set E5-11 to the encoder offset value written on the motor nameplate.
2. The encoder offset needs to be adjusted whenever the encoder is replaced or when reversing the direction of the motor.
3. Noise along the encoder cable.
4. Cables for the motor encoder are not wired properly, or the PG option card (or the encoder itself) is damaged.
5. Check the encoder wiring for any loose connections.
6. Make sure that the shielded line is properly grounded.