E.PUCI fault in KEB COMBIVERT F5 Drive indicates a Power Unit Invalid error. This means the drive’s control card could not correctly identify the power circuit during initialization, often due to electrical noise or poor connection.
Cause:
Initialization recognition failure. This error could occur from electrical noise.
Remedy:
- Disconnect the terminal strip, encoder cable, and serial communication (if used), then power cycle the drive.
- Check phase-to-phase and phase-to-ground line voltages to make sure they are balanced and not causing noise.
- Re-seat the ribbon cable connecting the control card to the power stage.
