Cause : Overfrequency - comes when maximum allowed output frequency exceeded due to Motor is turning faster than the highest allowed frequency due to incorrectly set minimum/maximum frequency or the motor rushes because of too high supply voltage or incorrect supply voltage.

1. Check minimum/maximum frequency settings, parameters 30.13 Minimum frequency and 30.14 Maximum frequency.
2. Check used supply voltage and voltage selection parameter 95.01 Supply voltage.