NOTE: If utility power fails or if the utility voltage goes outside of the permissible range during bypass mode
operation, the UPS shuts down and no output is supplied to the load.
Figure 2.15 Bypass Mode Operation
Item Description
1 Mains/Utility input (bypass input)
2 Rectifier/PFC
3 Inverter
4 Battery charger
5 Battery
6 Bypass static switch
7 UPS output
2.7.3 Battery Mode
Battery mode supplies battery power to the load if utility power fails or if the utility voltage goes outside of the permissible
range. On the front panel display, the run indicator (green) is ON, the alarm indicator (yellow) is ON, and the buzzer beeps
once each second. The LCD Flow screen displays On Battery. Figure 2.16 on the next page shows the diagram of battery
mode.
NOTE: The batteries are fully charged before shipment. However, transportation and storage inevitably cause some
loss of capacity. To ensure adequate back-up time, it is recommended to charge the batteries for at least 8 hours
before first start-up.
NOTE: If utility power fails and the batteries are charged, you may cold-start the UPS in battery mode and use battery
power to extend system availability for a time.
2 Product Description Proprietary and Confidential ©2024 Vertiv Group Corp. 15
Vertiv™ Liebert® GXT5 UPS Installer/User Guide