Vertiv Liebert GXT5 - Silencing the Audible Alarm; Starting-up the UPS; Transferring to Battery Mode; Normal to Bypass Mode Transfer

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4 Operating the UPS

4.1 Silencing the Audible Alarm

The audible alarm may sound during UPS operation. To silence the alarm, press and hold the ESC button for 2 seconds. The

button is located on the front panel display, see Operation and Display Panel on page55.

4.2 Starting-up the UPS

IMPORTANT! Do not start the UPS until after the installation is finished, the system is commissioned by an authorized

engineer, and the external input circuit breakers are closed.

CAUTION: Starting the UPS applies mains/utility power to the output terminals. Make sure that the load

power is safe and ready to accept power. If the load is not ready, isolate the load with the output terminal.

The UPS starts in Normal Mode.

To start the UPS:

1. If included on your UPS model, make sure the maintenance bypass switch is in the open (off) position and that

the guard is secured in place.

2. Ensure that the REPO connector on the rear of the unit has a jumper between pins 7-8 or that it is properly wired

to an Emergency Power off circuit (normally closed).

3. Make sure the breaker supplying power to the UPS is closed and close the input breaker on the rear of the UPS if

included on your UPS model or if necessary press the input circuit breaker reset buttons at the rear of the UPS.

4. If included on your UPS model, close the bypass breaker on the rear of the UPS.

5. Close all output breakers on the rear of the UPS (or in an external panel board, if used).

6. If external battery cabinets are attached, close the breakers on the rear of each cabinet.

7. Power on the UPS by pressing and holding the Power button on the operation and display panel until the

confirmation dialog appears. Use the Up/ Down arrows to select YES, then press Enter.

8. If this is the first time start-up of the UPS, the Start-up guidance wizard opens to set the basic parameters of the

UPS. Follow the prompts.

For detailed description of UPS display functions and settings, see Operation and Display Panel on page55.

4.3 Transferring to Battery Mode

The UPS operates in Normal mode unless the mains/utility power fails or it is performing a battery self test, then it

automatically transfers to Battery mode for the back-up time available or the mains / utility power is restored. Once input

power is restored, the UPS returns to Normal mode.

NOTE: Battery back-up run times are listed in Battery Run Times on page99.

4.4 Transferring from Normal to Bypass Mode

Press and hold the Power button for 2 seconds.

If the bypass power is within normal operating range, the option to continue to turn-on or turn-off the UPS displays:

Vertiv™ Liebert® GXT5 UPS Installer/User Guide

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