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Operation
Liebert
®
GXT3
™
24
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 operating from mains 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.
8.4 Put the Liebert GXT3 in Manual Bypass
Press the Standby/Manual Bypass button and hold it for about 2 seconds while the UPS is in Mains
(AC) Mode. The UPS will transfer the connected loads to the internal bypass. If the internal bypass is
not available because of mains power problems, pressing this button once will be ignored. Bypass
operation is indicated by an audible alarm and illuminated amber Bypass indicator. (If other
indicators are illuminated, refer to 11.0 - Troubleshooting.)
8.5 Shut Down the Liebert GXT3
1. Transfer the UPS to manual bypass by pressing the Standby/Manual Bypass button and holding
it for about 2 seconds.
If manual bypass is not available, disregard the first step.
2. Press the Standby/Manual Bypass button twice within four seconds, each time holding it for
about two seconds.
Power to the connected loads is now Off.
8.6 Disconnecting Input Power from the Liebert GXT3
1. After the UPS has been shut down as detailed in 8.5 - Shut Down the Liebert GXT3, turn off
the Output Circuit Breaker.
2. Wait 30 seconds and verify that all indicators have turned Off and the fan has stopped; this
indicates that the power-off is complete.
3. Turn the external battery cabinet breaker switch to the Off position if the UPS has an external
battery cabinet.
After powering off the UPS, the UPS ceases output and the load is powered Off.
8.7 Maintenance Bypass
Maintenance Bypass Mode is used when maintenance or replacement is required. To place the unit in
Maintenance Bypass:
1. Place the UPS on internal bypass. This may be done by either of the following methods:
a. Press the Off button on the front panel one time.
b. Slide the bracket away from the manual bypass breaker on the rear of the UPS. This requires
loosening the captive screw and sliding the bracket up and away from the Manual Bypass
Breaker.
2. Move the Manual Bypass Breaker on the rear of the UPS to the bypass position. This requires
loosening the captive screw and sliding the bracket up and away from the manual bypass breaker.