E.FnEt fault in KEB COMBIVERT R6 Drive indicates a line frequency error. This means the main line frequency is out of the acceptable tolerance range (e.g., 57-60Hz) or is suffering from severe generator swing.
Cause:
Main line frequency variations.
- Line frequency out of range (57-60Hz, based on 60Hz nominal line).
- Generator power operation causes voltage frequency swing.
- High electrical Noise/EMI.
Remedy:
Monitor Main Line Frequency at CP.2. Output frequency from generator may be too high/low and may change as various other loads come on/offline. Refer to Noise/EMI in Section 6.2.2.
