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 page37.
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 to 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 if necessary, press the input circuit breaker
reset buttons at the rear of the UPS.
4. Close all output breakers on the rear of the UPS (or in an external panel board, if used).
5. If external battery cabinets are attached, close the breakers on the rear of each cabinet.
6. 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.
7. 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 page37.
4 Operating the UPS Proprietary and Confidential ©2024 Vertiv Group Corp. 33
Vertiv™ Liebert® GXT5 UPS Installer/User Guide
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