2. Optional rack-mount handles are shipped with the external battery cabinet and may be installed at this time if
desired.
3. Securing hardware and slide rails are sold separately. Please contact your local dealer or Emerson
representative for these additional options and any assistance needed. Fasten the slides into position with the
screws per the instructions included with the slide rails.
4. Use the enclosed support bases for the tower option to prevent tip-over. One additional set of support base
extensions ships with each external battery cabinet.
5. Put the UPS in Bypass Mode by pressing the bypass button on the front of the unit and holding it about 2
seconds.
6. Verify the External Battery Cabinet breaker is in the Off position.
7. Connect the supplied external battery cabinet cable to the rear of the external battery cabinet, then to the rear
of the UPS.
8. Turn the External Battery Cabinet breaker to the On position.
9. Press the On button on the front of the UPS for 4 seconds to return the unit to Inverter Mode.
10. Verify the circuit breaker on the External Battery Cabinet is in the On position.
11. Use the included configuration program to program the UPS for the number of external battery cabinets
connected. Instructions for the configuration program are in Configuration Program on page 35.
12. The UPS is now equipped with additional backup battery run time. For approximate battery run times, refer to
Table 12.8 on page63.
NOTE: When removing the External Battery Cabinet, the circuit breaker on the rear of the cabinet must be turned off
before disconnecting the cable.
NOTE: If the UPS is to be shipped or stored for an extended time, the connector should be disconnected. This will
minimize any standby current drain on the batteries and help attain their design life.
5.3 Connect Input/Output Power
WARNING! Risk of electric shock. Can cause injury or death.Disconnect all local and remote electric power
supplies before working within. Ensure that the Liebert GXT3 is shut down and power has been
disconnected before beginning any work on or in the unit.
The Liebert GXT3-5000RT208, Liebert GXT3-6000RT208 and Liebert GXT3-6000RTL630 are shipped with a power
distribution box attached. The Liebert GXT3-8000RT208 and Liebert GXT3-10000RT208 are shipped with a cover plate
over the power distribution connector.
Follow the instructions below for removal and installation.
NOTE: Do not operate the UPS with the power distribution box removed. To shut off all power to this box and to the
load, utility input power must be disconnected.
5.3.1 Remove the Power Distribution Box from 5000 and 6000VA Models
1. Put the Liebert GXT3 in maintenance bypass by pressing the Standby/Manual Bypass button while the UPS is
in Utility (AC) Mode and holding the button for about 2 seconds. (For help, refer to Put the Liebert GXT3 in
Manual Bypass on page 42.)
2. Loosen the captive screw over the maintenance bypass breaker (see Figure 5.7 on the next page for the
breaker’s location).
3. Turn the maintenance bypass breaker On.
NOTICE
The load is unprotected from disturbances in the power supply while the UPS is on bypass.
4. Turn the output and input breakers Off.
5. Loosen other captive screws until the power distribution box releases.
6. Remove the power distribution box from the UPS and set it aside.
7. Loosen the screws over the plastic cover for the connector on the rear of the panel.
8. Slide the plastic cover over the connector and tighten the screws.
Vertiv | Liebert® GXT3 ™ Installer/User Guide | 29
To Next Page