E.UP fault in KEB COMBIVERT R6 Drive indicates an undervoltage condition. This means the DC bus level is too low, pointing to poor power quality, a loss of phase, or sagging line input voltage.
Cause:
DC bus level is too low.
Remedy:
Likely indicates poor power quality. Verify line input voltage. Sagging voltage or loss of phase could cause E.UP error. Check all grounding including X0 of transformer.
