8 OPERATION
This section describes checks to be made before starting the UPS, how to start the UPS, manual battery test, manual
bypass, shutting down the UPS and disconnecting the utility power from the UPS.
NOTE: The Liebert GXT3’s battery has been fully charged before delivery, but some charge will be lost during storage
and shipping. To ensure that the battery has adequate reserve power to protect the connected load, charge the
battery for three hours before putting the UPS into service.
8.1 Startup Checklist for the Liebert GXT3
Before starting the UPS, perform these checks:
1. Check that the input plugs and loads are connected properly and reliably.
2. Check that the battery cable is connected properly.
3. Check that the communication cables are connected properly.
8.2 Initial Startup and Electrical Checks
1. Verify that the Input/Output circuit breakers are off.
2. During initial system checks, disconnect all loads (open load disconnects).
3. Inspect all wiring, cables and connection.
4. If external battery cabinets are used, verify that the battery interconnect cables are fully inserted in the sockets.
5. Place the manual bypass breaker in BYPASS position.
6. Turn on the branch circuit disconnect to apply voltage to the input terminal block.
7. Using a voltmeter, verify the expected L1-N (L2) voltage.
Verify that the same voltages appear at the Output terminals. The Bypass lamp by the switch will light.
8. After verifying proper input voltage to the UPS terminal block, turn off the branch circuit power, close all
access panels to the distribution box and reapply input power.
9. Close the Input circuit breaker located on the distribution box. The green AC INPUT lamp should illuminate on
the front panel.
10. Press the ON button and hold it for four seconds. After several seconds, the UPS ON lamp will turn on
continuously. If the batteries are determined to be charged above 80%, an automatic battery test will run for
about 15 seconds.
11. Close the Output circuit breaker on the rear of the power distribution box. The light by the input breaker will
illuminate.
12. Return the breaker to the Inverter position. The output terminal block will be powered at this time.
13. Connect all loads for normal operation.
8.3 Manual Battery Test
To initiate a manual battery test, press the On/Alarm Silence/Manual Battery Test button for at least half a second while the
UPS is operating from utility power with no alarm conditions present.
• If only the first two of the five LED segments illuminate, allow the UPS to recharge the batteries for 24 hours.
• Retest the batteries after 24 hours of charging.
• After the batteries have been retested, if only two of the five Battery LEDs illuminate, contact your local
Emerson representative or Emerson Network Power Channel Support.
• If none of the five Battery LEDs illuminate during a manual battery test, check the battery connection and allow
the UPS to recharge the batteries for 1 hour, then initiate a manual battery test again.
• If none of the five Battery LEDs illuminate during the second manual battery test, replace batteries and contact
your local Emerson representative or Emerson Channel Support.
Vertiv | Liebert® GXT3 ™ Installer/User Guide | 41
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