Disconnect all AC and DC sources before servicing. Check for residual voltage using both AC and DC voltmeters.
The following procedures provide a step-by-step guide to common manual fixes for the Liebert Hipulse D UPS: liebert hipulse d ups manual fix
The following manual fix procedures can be used to repair common issues with the Liebert Hipulse D UPS: Disconnect all AC and DC sources before servicing
The Hipulse D is extremely sensitive to phase rotation and voltage harmonic distortion. Often, the utility voltage is within spec, but the phase sequence is wrong or the DC bus pre-charge resistor (R01-R03) has failed. Often, the utility voltage is within spec, but
The Hipulse E’s LCD showed a red "General Alarm," but the active fault log only listed: "Phase Rotation Error – Source 1 (Mains)."
For faults that can be cleared by the operator, follow these procedures.
Before turning a wrench, look at the front Mimic Panel and Liquid Crystal Display (LCD). The Hipulse D categorizes issues using LED indicators and text alarms. Common Alarm Indicators