The Hipulse D’s default battery test is a "load step" test. It ramps the inverter to pull current from the batteries while still online. If the battery internal resistance is slightly high (but not dead), the voltage dips below the "Boost Charge Threshold," causing an auto-abort.
Reduce the connected load immediately. The UPS may transfer to bypass if the overload continues. liebert hipulse d ups manual fix
The UPS runs on mains, but self-test fails immediately. The LCD shows "Battery low voltage" or "Battery under load fail." The Hipulse D’s default battery test is a "load step" test
If the UPS requires internal repair, you must manually transfer the load to maintenance bypass to ensure continuous power: liebert hipulse d ups manual fix