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8.0 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 mains power from the
UPS.
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 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 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 manual breaker to the Inverter position. The output terminal block will be powered at
this time.
13. Connect all loads for normal operation.
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.