2.5.5 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.
2.5.6 Battery
The GXT4 uses valve-regulated, non-spillable, lead acid batteries. To maintain battery design life, Operate
the GXT4 in an ambient temperature of 32°F to 77°F (0°C to 25°C).
Optional external battery cabinets are available to extend battery run times.
2.5.7 Dynamic Bypass
The GXT4 provides an alternate path for utility power to the connected loads in the unlikely event of a
UPS malfunction. Should the GXT4 have an overload, over-temperature or UPS failure condition, the UPS
automatically transfers the connected loads to bypass.
NOTE: The bypass power path does not protect the connected loads from disturbances on the utility.
2.5.8 Battery Cabinet
Optional battery cabinets are available for the Liebert® GXT4, shown in Battery cabinet on the next
page.The battery connectors and input breaker are on the battery cabinet’s rear panel, as shown in the
figure. For battery cabinet specifications, refer to Specifications on page53. The GXT4 may be equipped
with a maximum of 6 extension battery packs.
For battery run times, refer to Battery run times (continued) on page60.
WARNING! Do not contact the battery connectors and ground to avoid electrical shock. The
battery loop and AC input are not insulated, which may cause a dangerous voltage between the
battery connectors and ground.
NOTE: External Battery Connectors are wired in parallel. Either connector can be connected to the UPS
or to another battery cabinet.
NOTE: The standard battery cable delivered with the battery cabinet is 0.65m (2.13ft) long.
2 GXT4 Description
17
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