Dc-To-Dc Converter; Battery; Internal Bypass; Maintenance Bypass - Emerson GXT4-5000RT230 User Manual

Product Description
1.6.5

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.
1.6.6

Battery

The Liebert GXT4 utilizes valve-regulated, nonspillable, lead acid batteries. To maintain battery design life,
operate the UPS 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. For run times, see Table 8-8.
1.6.7

Internal Bypass

The Liebert 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, overtemperature 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
1.6.8

Maintenance Bypass

The Liebert 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.

1.7 Operating Mode

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 3.0 - Operation and Display Panel for details about the operating mode indicators and control
buttons.
1.7.1

Mains Mode

During Mains Mode, the mains provides input power to the Liebert 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.
1.7.2

Manual Bypass Mode

Manual Bypass Mode occurs when the unit is manually placed in internal bypass by navigating the LCD
menu to select 3 Control > 1 Turn On & Off > Turn UPS Bypass. Bypass operation is indicated by an
audible alarm and illuminated amber bypass indicator. (If other indicators are illuminated, refer to 7.0 -
Troubleshooting). During Bypass Mode, mains power bypasses the inverter and provides energy to the
connected load.
NOTICE
Risk of loss of power to the connected load. Can cause equipment damage.
Turning Off the UPS in Bypass Mode will result in loss of output power to the connected load.
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Liebert GXT4 User Manual 10