Cause : High Slip Braking oL comes when he output frequency stayed constant for longer than the time set to n3-04 during High Slip Braking.

1. Reduce deceleration times in parameters C1-02, C1-04, C1-06, and C1-08 for applications that do not use High Slip Braking.
2. The overload time during High Slip Braking is too short. Use a braking resistor to shorten deceleration time.