Emerson GXT2U - Manual (Page 10)

6
DC-to-DC Converter
The DC-to-DC converter utilizes energy from the battery system and raises
the DC voltage to the optimum operating voltage for the inverter. This allows
the inverter to operate continuously at its optimum efficiency and voltage,
thus increasing reliability.
Battery
The Liebert GXT2U utilizes valve-regulated, nonspillable lead acid batteries.
To maintain battery design life, operate the UPS in an ambient temperature
of 68°F to 77°F (20°C to 25°C). Optional external battery cabinets are
available to extend battery run times.
Dynamic Bypass
The Liebert GXT2U provides an alternate path for utility power to the
connected load in the unlikely event of a UPS malfunction. Should the UPS
have an overload, overtemperature, or 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
button once.
NOTE
The bypass power path does NOT protect the connected equipment
from disturbances on the utility supply.