Emerson Dual Conversion Online UPS GXT3-6000RT208 User Manual

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 con-

nection 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 batter-

ies and contact your local Emerson representative or Emerson Channel Support.

Press the Standby/Manual Bypass button and hold it for about 2 seconds while the UPS is in Utility 

(AC) Mode. The UPS will transfer the connected loads to the internal bypass. If the internal bypass is 

not available because of utility power problems, pressing this button once will be ignored. Bypass 

operation is indicated by an audible alarm and illuminated amber Bypass indicator. (If other indica-

tors are illuminated, refer to 11.0 - Troubleshooting.)

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.

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.

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.