Based on technical documentation, manual intervention is often required for startup, bypass transitions, and fault resets: : Close the input breaker .
Check the input rectifier/charger SCRs for shorts.
First, a quick note on your UPS's lineage. The is a high-end industrial UPS, built on an online double-conversion topology and designed for mission-critical environments like data centers, manufacturing plants, and process control systems. Its sophistication means many issues can be resolved through proper procedures, but always respect the high voltages involved. liebert hipulse d ups manual fix
"Over Temperature" alarms, intermittent shutdowns, or audible mechanical grinding noise.
Reseat all internal ribbon cables connecting the main control board to the gate drive boards. Dust and vibration can degrade these connections over time. The is a high-end industrial UPS, built on
| | Likely Cause | Recommended Action / Fix | | :--- | :--- | :--- | | INV. OFF | Inverter switched off or internal fault. | Check for other inverter alarms; seek service if fault persists. | | INV. OVERTEMPER. | Overheating due to poor ventilation. | Clean filters/fans, reduce ambient temp; load transfers to Bypass after 3 min. | | OVERLOAD PRESENT | Connected load exceeds 100%. | Reduce connected load immediately. | | RECT. OFF | Rectifier input failure or internal fault. | Check if Q1 is closed and input supply is normal. | | BATTERY: E.O.D. | Battery discharge beyond safe limit. | Initiate orderly shutdown; test/replace batteries. | | BYP. ABSENT | Bypass supply missing or failed. | Check if Q2 is closed and bypass input is stable. | | INV. UNSYNCHRONIZED | Bypass frequency out of acceptable range. | Check bypass source frequency; avoid switching off inverter. | | MANUAL BYPASS CLOSED | Load on unprotected maintenance bypass. | Follow procedure to transfer back to normal operation. | | BYP. SCR FAILURE | Static switch component failure. | Seek qualified assistance immediately. | | INV: PARALLEL ERROR | Incorrect load sharing in a parallel system. | Seek qualified assistance to investigate parallel board. |
Troubleshooting the Liebert HiPulse D industrial UPS involves addressing common alarms like input switch failures, rectifier issues, and inverter over-temperature by checking DC voltage levels, battery breakers, and cooling components. Safe operation requires adhering to maintenance bypass procedures and, due to high-voltage hazards, ensuring only qualified personnel conduct repairs. Detailed operational procedures are outlined in the manual available at 5.imimg.com Prasa Infocom & Power Solutions Pvt. Ltd. Liebert Hipulse D Industrial AC UPS 5-160KVA Reseat all internal ribbon cables connecting the main
If you're still unsure or uncomfortable with performing manual fixes, consider contacting Vertiv support or a certified UPS technician for assistance.
⚠️ The Hipulse D is a high-power (80–500 kVA) UPS with large DC bus capacitors that hold lethal voltage for many minutes after disconnecting power. Only qualified technicians should attempt internal fixes.
Step 2 — Restore safe state
This guide is for informational purposes, focusing on resolving common operator-addressable issues.