Vertiv | Liebert® GXT5™ | Installer/User Guide 15
1.7.2. Bypass Mode
Bypass mode supplies power to the load from the bypass source (utility power) if an overload or fault occurs
during normal operation. On the front-panel display, the run indicator (green) is On, the alarm indicator (yellow)
is On, and the buzzer beeps once each seconds. The LCD “Current” screen displays “On Bypass.” Figure 1-14 on
the facing page, shows a diagram of bypass mode.
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 1-14 Bypass-mode Operation
ITEM. DESCRIPTION
1 Mains/Utility input (by-pass input)
2 Rectier/PFC
3 Inverter
4 Battery charger
5 Battery
6 Bypass static switch
7 UPS output
1.7.3. 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 “Current” screen displays “On Battery.” Figure 1-15 on the next
page, shows a 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, charge the batteries for at least 8 hours before rst
start-up.
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