Vertiv Liebert GXT4-3000RT120 User Manual

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Liebert®

GXT4™ UPS

Installer/User Guide

120V/208V, 500VA – 3000VA

Table of Contents

Questions and Answers:

S
Stephanie WebsterAug 9, 2025
Why does my Vertiv UPS have reduced battery backup time?
- K
  Karen LeonAug 9, 2025
  The Vertiv UPS might have reduced battery backup time because the batteries are not fully charged. To resolve this, keep the UPS plugged in continuously for at least 24 hours to recharge the batteries. Alternatively, the UPS could be overloaded, so check the load level indicator and reduce the load. Lastly, the batteries may not be able to hold a full charge due to age, in which case you should replace them.
M
marycoxAug 14, 2025
Why is the battery indicator illuminated on my Vertiv UPS?
- M
  Melissa ScottAug 14, 2025
  The battery indicator illuminates when the Vertiv UPS is operating from battery mode. This can occur if the UPS is not securely plugged into the wall receptacle, so ensure it is properly connected. It can also happen if the UPS input protection fuse has blown or opened, in which case you should save data, close applications, replace the UPS input fuse, and then restart the UPS. Finally, the mains power may be out of tolerance, so you should ensure the mains supply voltage is within acceptable limits for the UPS, and save data and close applications.
K
Kevin SchultzAug 20, 2025
How to fix a Vertiv Liebert GXT4-3000RT120 that fails to start?
- T
  Thomas AbbottAug 20, 2025
  The Vertiv UPS might fail to start because it is short-circuited or overloaded. Ensure the UPS is off, disconnect all loads, and make sure nothing is lodged in the output receptacles. Also, verify that the loads are not defective or shorted internally. Another reason could be that the batteries are not charged enough or not connected. Check to ensure the internal battery is connected; if not, make the connection and try to start the unit. If the battery is connected, leave the UPS connected to input power for 24 hours to recharge the batteries, then try to start the unit.
J
Jennifer BrownAug 27, 2025
What to do if the battery indicator is flashing on my Vertiv Liebert GXT4-3000RT120 UPS?
- M
  Martha PorterAug 27, 2025
  The flashing battery indicator on your Vertiv UPS indicates that the battery source is not available, which is accompanied by a continuous horn. Check the battery connections, completely power down, and then restart the UPS. If the battery circuit opens while the UPS is running, it will be detected during the next battery test.
A
Ariel KelleySep 2, 2025
Why is the bypass indicator flashing on my Vertiv UPS?
- J
  John JohnsonSep 2, 2025
  The bypass indicator flashes on the Vertiv UPS because the voltage or frequency is outside acceptable limits, disabling the bypass. The AC input powers the PFC input and serves as the bypass source. If the AC is present but the voltage or frequency exceeds the acceptable range for safe operation with a load, the bypass will be disabled, and this indicator will flash, indicating that the bypass is unavailable.

Vertiv Liebert GXT4-3000RT120 Specifications

General

Brand	Vertiv
Model	Liebert GXT4-3000RT120
Category	UPS
Language	English

Summary

1 IMPORTANT SAFETY PRECAUTIONS

2 GXT4 DESCRIPTION

2.5 Major Components

Explains the core internal components and their functions within the UPS architecture.

2.6 Operating Modes

Outlines the different operational states the UPS can enter, such as Mains, Battery, and ECO modes.

3 INSTALLATION

3.4.1 Tower Installation

Details the procedure for installing the UPS in a vertical tower configuration.

3.4.2 Rack Installation

Guides on installing the UPS in a standard equipment rack.

3.4.4 Connecting to AC Mains and Loads

Guides on connecting the UPS to the power source and connected equipment.

3.4.5 Connecting Battery Cables

Instructions for connecting the UPS to external battery cabinets.

4 OPERATION AND DISPLAY PANEL

4.4 Menu Structure Details

Outlines the navigation hierarchy and options available on the UPS LCD menu.

4.7 Fault List

Lists common faults, their causes, and corrective actions for troubleshooting.

5 OPERATION

5.1 Startup Checklist for the GXT4

5.2 Starting the UPS

Step-by-step instructions for powering on and initiating the UPS.

5.3 Performing a Manual Battery Test

5.4 Performing Manual Bypass

5.5 Shutting Down the GXT4

5.6 Disconnecting Input Power from the GXT4

7 MAINTENANCE

7.1 Replacing the Internal Battery Pack

Provides part numbers for internal battery packs for GXT4 models.

7.1.1 Battery Replacement Procedures

Step-by-step guide for safely replacing the internal battery pack.

7.4 Checking UPS Status

7.5 Checking UPS Functions

8 TROUBLESHOOTING

8.1 Troubleshooting Symptoms

Identifies common symptoms indicating a potential UPS malfunction.

8.1.1 Faults

Lists displayed faults, their causes, and corrective steps for UPS issues.

8.1.2 Audible Alarm

8.2 UPS Issue Resolution

Provides a table to diagnose and resolve common UPS problems.

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