The "fix" almost always begins with the LCD display. The HiPulse D manual categorizes issues into three levels:
Disconnect all AC and DC sources (batteries) before servicing. Qualified Personnel: liebert hipulse d ups manual fix
The UPS starts, the fans run, but the rectifier contactor (K1) never closes. The LCD shows E04. The "fix" almost always begins with the LCD display
Note any active alarms on the display (e.g., Inverter Failure, DC Overvoltage, Fan Failure) [1, 3]. the fans run
The UPS will not transfer to bypass during maintenance, or it reports "SSW short circuit."
: Continuous earth connection is essential before connecting input supply due to high leakage currents. 2. Common LCD Messages and Troubleshooting Vertiv Liebert Hipulse D
(component swap, fuse, fan, capacitor):