Nidec & Control Techniques Unidrive M700, M600, M400, HS30 & HS70 Drive
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Apr 13, 2024 5:24 am
Cause : Motor speed has exceeded the over speed threshold comes when in open loop mode, if the Output Frequency (05.001) exceeds the threshold set in Over Speed Threshold (03.008) in either direction an Over Speed trip is produced.
In RFC-A and RFC-S mode, if the Speed Feedback (03.002) exceeds the Over Speed Threshold in Pr 03.008 in either direction an Over Speed trip is produced. If Pr 03.008 is set to 0.0 the threshold is then equal to 1.2 x the value set in Pr 01.006.
- Check the motor is not being driven by another part of the system.
- Reduce the Speed Controller Proportional Gain (03.010) to reduce the speed overshoot (RFC-A, RFC-S modes only).
- If an SSI encoder is being used set Pr 03.047 to 1.
