Selected motor, the motor is turning faster than highest allowed speed due to incorrectly set minimum/maximum speed, insufficient braking torque or changes in load when in torque control.
Check:
− The settings of 30.11 M1 minimum speed, 30.12 M1 maximum speed and 31.30 M1 overspeed trip margin.
− The settings of the speed controller in group 25 Speed control.
− The setting of 46.02 M1 speed scaling actual.
− The torque control settings.
− For correct speed feedback when using an encoder or a tacho. Thus, compare the value of 90.01 Motor speed for control vs. the measured motor speed (hand held tacho).
− For proper connection of the speed feedback measurement.
− For correct field current.
− If the motor was accelerated by the load.
− If the DC-voltage measurement (C1, D1) might be swapped when EMF speed feedback is used.
− If the armature circuit is open (e.g. DC-fuses, DC-breaker,
...) when EMF speed feedback is used.