Inspect the DC capacitor bank for physical deformation, leaking electrolyte, or bulging tops. Replace failed capacitors in matched sets.
| | 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. | liebert hipulse d ups manual fix
Clean battery terminals showing white sulfate deposits with a mixture of baking soda and water, then torque the bolts to factory specifications. Inspect the DC capacitor bank for physical deformation,