Liebert Hipulse D Ups Manual Fix May 2026

Symptom: Manual or automatic battery test fails within seconds; alarm log shows “Battery End Voltage” or “High DC Ripple.”

Common Fix:

Symptoms: Under a partial load (e.g., 40%), the inverter trips. The load is stable but includes power factor correction (PFC) capacitors or server power supplies (crest factor 3:1). liebert hipulse d ups manual fix

Root Cause: The Hipulse D has a "Neutral Current Protection" feature. If the third harmonic content on the output exceeds 30% of the fundamental current, the software falsely detects a ground fault.

The Manual Fix – The Filter Bypass (Only for IT Loads): Symptom: Manual or automatic battery test fails within

Hardware Fix (Advanced): Add a K-factor rated isolation transformer between the UPS output and the load to absorb the neutral current.

Symptoms: "Over Temperature" alarms, intermittent shutdowns, or audible mechanical grinding noise.

The Fix: The Hipulse D uses forced-air cooling. Ball-bearing failure is common in dusty environments. Hardware Fix (Advanced): Add a K-factor rated isolation

Symptoms: The UPS will not transfer to bypass during maintenance, or it reports "SSW short circuit."

Manual-Guided Repair: