Liebert Vertiv GXT5, Installer/User Manual

Page: 55 / 136

Vertiv | Liebert® GXT5™ | Installer/User Guide 47
Chapter 3:
Operating the UPS
3.1. 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 53 .
3.2. 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.