Vertiv GXT4-10000RT230, Installer/User Manual, Page: 17 / 66

2.7.5 DC-to-DC Converter
The DC-to-DC converter raises the DC voltage from the battery to the optimum operating voltage for the
inverter. This allows the inverter to operate continuously at its optimum efficiency and voltage, thus
increasing reliability.
2.7.6 Battery
The GXT4 uses valve-regulated, non-spillable, lead acid batteries. To maintain battery design life, Operate
the GXT4 in an ambient temperature of 15°C to 25°C (59°F to 77°F).
Optional external battery cabinets are available to extend battery run times.
2.7.7 Internal Bypass
The GXT4 provides an alternate path for mains power to the connected load in the unlikely event of a
UPS malfunction. Should the UPS have an overload, over-temperature or any other UPS failure condition,
the UPS automatically transfers the connected load to bypass. Bypass operation is indicated by an
audible alarm and illuminated amber Bypass LED (other LEDs may be illuminated to indicate the
diagnosed problem).
To manually transfer the connected load from the inverter to bypass, press the Standby/Manual Bypass
button once and hold it for about 2 seconds
2.7.8 Maintenance Bypass
The GXT4 provides a manual maintenance bypass in a removable section of the rear of the UPS. This
allows replacement of the UPS in the event of a UPS malfunction while keeping the connected equipment
powered with utility power.
NOTE: The bypass power path does not protect the connected equipment from disturbances in the
mains supply.
2.8 Operating Modes
The UPS operation modes include the following: Mains (AC) Mode, Bypass Mode, Battery Mode, Battery
Recharge Mode, Active ECO Mode and Frequency Converter Mode.
Refer to Operation and Display Panel on page 31 for details about the operating mode indicators and
control buttons.
2.8.1 Mains Mode
During Mains Mode, the mains provides input power to the GXT4. The filters, PFC circuit and inverter
process this power to provide high-quality sine wave power to connected loads. The UPS maintains the
batteries in a fully-charged state.
Vertiv | Liebert GXT4 Installer/User Guide | 17