4 Chapter 1 Product Description
Liebert GXT4 UPS 700VA ~ 3000VA (230V) User Manual
Battery
The Liebert GXT4 UPS uses valve-regulated, nonspillable, lead acid batteries. To maintain the battery design life,
operate the Liebert GXT4 UPS 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 time.
Dynamic bypass
The Liebert GXT4 UPS provides an alternate path for utility power to the connected loads in the unlikely event of a
UPS malfunction. Should the Liebert GXT4 UPS 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 power.
1.5 Operating Mode
The UPS operation modes include: Utility (AC) mode, Manual Bypass mode, Battery mode, Battery Recharge mode,
Frequency Converter mode and Green mode.
For the descriptions of indicators and control buttons in this section, refer to Chapter 3 Operation And Display
Panel.
Utility (AC) mode
During Utility (AC) mode, utility power provides energy to the Liebert GXT4 UPS. The filters, PFC circuit and the
inverter process this power to provide computer-grade power to connected loads. Meanwhile, the UPS maintains the
batteries in a fully charged state.
Manual Bypass mode
Manual bypass mode occurs when you select Main Menu -> 3 CONTROL -> 1 TURN ON & OFF to enter the TURN
ON & OFF screen, and select ‘TURN UPS BYPASS’ while the Liebert GXT4 UPS is in Utility (AC) mode. Bypass
operation is indicated by an audible alarm and an illuminated bypass indicator. “UPS in Bypass operation” will be
displayed in the LCD display panel. During manual bypass mode, utility power bypasses the inverter and provides
energy to the connected load.
Caution
Turning off the UPS in Bypass mode will result in loss of output power and dropped loads.
Battery mode
The Liebert GXT4 enters Battery mode when utility power fails or is outside acceptable values. The battery system
supplies power through the DC-to-DC converter to the inverter to generate clean AC power for the connected loads.
When the Liebert GXT4 enters Battery mode, the UPS sounds a half-second beep at 10-second intervals. When
approximately 2 minutes of run time remains, the beeps sound every 5 seconds to warn that the battery is getting low
(This Low Battery Warning is user-configurable).
In Battery mode, the battery indicator will illuminate, and “Utility power not available” will be displayed in the LCD
display panel.
For approximate battery run time, refer to Table 9-5 in Chapter 9 Specifications. The battery run time is based on
resistive load and an ambient temperature of 77°F (25°C). To increase the time, turn off non-priority loads (such as
idle computers and monitors) or add optional external battery cabinets.
Caution
1. Turning off the Liebert GXT4 when it is in Battery Mode will result in loss of output power.
2. If the UPS is turned off manually, it must be manually restarted after utility power returns.
3. If the UPS is turned off by a communication signal or because the batteries are depleted, it will operate as selected in the
configuration program for Auto-Restart (Refer to Configuration program in 5.2 USB Port Communication).
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