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2.6.3 Battery Mode

The GXT4 enters Battery Mode when mains power fails or is outside acceptable limits. 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 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 the LCD will show the prompt utility power not

available.

Press either the Up or Down button once, then press the Enter button to clear the prompt and silence the

audible alarm. Once the alarm prompt has been acknowledged, the screen showing the estimated battery

run time and battery capacity will be visible. Refer to Troubleshooting on page49.

For approximate battery run times, refer to Table 9.5 on page60.

NOTICE

Risk of loss of power to the connected load. Can cause equipment damage.

Turning Off the GXT4 when it is in Battery Mode will result in loss of output power to the

connected load.

If the UPS is turned Off manually, it must be manually restarted after mains power returns.

If the UPS is turned Off by a communication signal or because the batteries are depleted, it will

operate as set in the configuration program for Auto-Restart (Refer to Configuration Program

on page39).

2.6.4 Battery Recharge Mode

Once mains power is applied to the GXT4, the Battery Charger begins charging the batteries.

2.6.5 Frequency Converter Mode

All models of the GXT4 are capable of frequency conversion. Frequency Conversion Mode can be selected

using the configuration program. Allowable frequency operating modes include:

• Auto Sensing - 50 Hz or 60Hz – Bypass Enabled

• Auto Sensing - 50 Hz or 60Hz – Bypass Disabled

• Frequency Converter - 50 Hz – Bypass Disabled

• Frequency Converter - 60Hz – Bypass Disabled

NOTE: The default for all models of the Liebert® GXT4 is “Auto Sensing - 50 Hz or 60Hz – Bypass

Enabled.”

2.6.6 Active ECO Mode

All Liebert® GXT4 models can operate in Active ECO Mode. In this mode, the connected equipment is

powered through the bypass path to increase efficiency, reducing the electrical costs.

2 GXT4 Description

Vertiv Liebert GXT4 Series User Manual

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