Too high voltage on the armature/DC side.

Check:

− If the setting of 31.50 Overvoltage level is suitable for the
system.
− The settings of the field current controller, EMF controller,
flux linearization in group 28 EMF and field current control.
E.g. field weakening is not activated.
− For too high field current (e.g. problems with field
weakening).
− If the motor was accelerated by the load.
− For overspeed.
− For proper speed scaling. See 46.02 M1 speed scaling
actual.
− For proper armature voltage feedback.
− The cutting of the voltage coding resistors on the SDCS-
PIN-H51.