Emerson GXT2-10000RT208 Manuel D’Utilisation

The final step of installation may require custom configuration of your UPS using the enclosed config-

uration program. Some configuration settings may be changed only while the UPS is off. These should 

be set before the UPS is put into full time service powering the critical load.
For most users operating with 120VAC L-N, the factory default settings will be adequate. This section 

illustrates the features available for modification, as well as the factory default setting. 
The factory default L-N setting is 120 VAC. When first powered by the AC input, the UPS will auto-

sense the utility phase angle between L1 and L2, setting the UPS to operate as either a 120/208 VAC 

system (120 degrees, leading or lagging) or a 120/240 VAC system (180 degrees).
If your application requires that the L1-N, L2-N voltages be set at 100, 110, 115 or 127VAC, the corre-

sponding phase angle between L1 and L2 is restricted. The VAC settings of 100, 110 and 115 may 

work only with a phase angle of 180 degrees. A VAC setting of 127 VAC will work only with a phase 

angle of 120 degrees (leading or lagging).
To confirm the phase angle of the utility input, measure the L1-N, L2-N and L1-L2 VAC of the utility 

input that is intended for the UPS. If the measured L1-L2 voltage is equal to the average L-N voltage 

times 2.0, then the phase angle is 180 degrees and the L-N VAC may be set at 100, 110, 115 or 120 

VAC. The nominal L1-L2 voltages for these four settings will be 200, 220, 230 or 240 VAC, respec-

tively.
If the measured L1-L2 voltage is equal to the average L-N voltage times 1.73, then the phase angle is 

120 degrees and the L-N VAC may be set at either 120 or 127 VAC. The nominal L1-L2 voltages for 

these two settings will be 208 or 220 VAC, respectively.
Selecting an L-N nominal voltage that is not compatible with the L1-L2 phase angle detected by the 

UPS when AC input is applied will result in a fault alarm and the UPS will not operate from utility 

power.

The configuration program enables the user to perform the following functions:

• Select one of five input/output voltages to match voltages found around the world
• Disable the line-neutral-reversed/missing-ground receptacle wiring alarm (120VAC, single-phase 

models only)

• Select frequency converter operation with a fixed output frequency of 50 or 60Hz
• Enable or disable the audible alarm
• Set the Low Battery Warning alarm time from 2 to 30 minutes
• Enable or disable the Auto-Battery test
• Enable or disable the Auto Restart function
• Set the Auto-Battery test to 7, 14, 21 or 28 days
• Select the number of external battery cabinets connected to the UPS to adjust the remaining run-

time calculations reported by the UPS Liebert software products

• Modify the shutdown setting of DB-9 pin 6 (for information on pin assignments, see 11.0 - Com-

In addition to the UPS, you will need the configuration program CD (or installation file) and serial 

cable included in the UPS accessory box. A Windows 95

®

 -or-later based operating system is also 

required to run the configuration program.

www.liebert.com

For use with Liebert GXT2U model 
UPS systems.
Version 1.6

For Windows XP, 2000 NT, 98