Cause : Speed Deviation comes when the deviation between the speed reference and speed feedback is greater than the setting in F1-10 for longer than the time in F1-11.

1. Load is too heavy Reduce the load.
2. Accel/decel ramp is too short.
3. Increase the acceleration and deceleration times (C1-01 through C1-08).
4. The load is locked up.
5. Check the machine.
6. Parameter settings are inappropriate.
7. Check the settings of parameters F1-10 and F1-11.
8. The motor brake is not applied.
9. Ensure the motor brake operates properly with a brake control command from the drive.