Cause : Speed Deviation (when using a PG option card and AOLV/PM without PG) 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. Acceleration and deceleration times are set too short. Increase the acceleration and deceleration times.
3. The load is locked up. Check the machine.
4. Parameter settings are inappropriate. Check the settings of parameters F1-10 and F1-11
5. Incorrect speed feedback scaling when using terminal RP as speed feedback input in V/f Control.
   • Set H6-02 to value of the speed feedback signal frequency when the motor runs at the maximum speed.
   • Adjust the speed feedback signal using parameters H6-03 through H6-05.
   • Make sure the speed feedback signal frequency does not exceed the maximum input frequency of terminal RP.
6. The motor brake engaged. Ensure the brake releases properly.