Verify that no battery cables are loose or damaged. D. System Shutdown and Restart (Hard Reset)
Once the manual fixes are applied or maintenance is finished, use this step-by-step sequence to safely return your Liebert HiPulse D from maintenance bypass back to normal, double-conversion UPS protection:
Inspect the power blocks for bulging AC or DC capacitors or scorched metal oxide varistors (MOVs). If you spot oily residue beneath a capacitor or a charred black spot on a circuit board, that component must be replaced. 4. System Restart: Returning to Normal Operation liebert hipulse d ups manual fix
Check the torque on all DC busbar connections. Loose connections create resistance, leading to voltage drops and false sensing readings.
The UPS will not transfer to bypass during maintenance, or it reports "SSW short circuit." Verify that no battery cables are loose or damaged
Static switch fault or bypass source out of synchronization sync. Verify bypass input voltage and frequency tolerances. Step 2: Diagnostic and Manual Fix Workflows 1. Resolving "Inverter Fault" or "Inverter Off"
Before attempting a manual fix, identify the exact fault code or message on the 2x20 character display panel. Common messages include: If you spot oily residue beneath a capacitor
Always keep a copy of the . Mixing control board revisions (e.g., P/N 540-0091 rev C with rev E) can cause bypass desynchronization and inter-module comms faults.
These messages indicate a critical issue that will cause, or has already caused, the UPS to shut down. The load will typically transfer to bypass power if it's available.
If you can tell me the , I can provide a more tailored troubleshooting step for your situation. Share public link