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4.6 Return from Maintenance Bypass
1. Ensure all switches and circuit breakers upstream of the UPS are closed.
2. Ensure that both input circuit breakers are in the On position.
3. Turn the Maintenance breaker from BYPASS to UPS and replace the cover.
The load now is supplied via electronic bypass.
4. Press the Menu button, select Control and press the Enter key .
5. Select Turn UPS On/Off and press the Enter key .
The LCD displays Turn UPS to ONLINE.
6. Press the Enter key to switch on the inverter.
The UPS is now in online operation.
4.7 Maintenance Breaker, Off Position
• Move the breaker to the Off position to transfer the load from the UPS to utility.
4.8 Self-Tests
4.8.1 Lamp Test
1. With the Liebert GXT3-10000T220 connected to the utility, press the Menu button, select Control
and press OK.
2. Select Turn UPS On/Off and press OK.
3. The LCD will show Turn UPS to BYPASS.
4. Press OK to off the inverter to Bypass mode.
5. A single acoustic signal confirms the operation.
6. Select Turn UPS On/Off and press OK to place the UPS back in Normal Mode operation. The UPS
performs the test during Start-up.
4.8.2 Battery Test
1. Press the Menu button.
2. Select SETUP and press OK.
3. Select BATT TEST and press OK.
A single acoustic signal confirms the operation and the load will be supplied by the battery.
If the test is successful, the BATT LED will stop flashing and the UPS will return to Line mode. If the
UPS circuitry detects a battery malfunction, Liebert GXT3-10000T220 will display an alarm (see
4.2.1 - Controls and Messages).
!
WARNING
The output breaker on this unit does not protect every output configuration. Power to the load
could be supplied immediately when the output is enabled. (Figure 9 illustrates the location of
the output breaker in the output configuration.)
NOTE
This test involves putting the Liebert
®
GXT3-10000T220
™
into bypass mode. The load is not
protected against any utility disturbances or interruptions while the UPS is in bypass mode.
NOTE
During the test an acoustic signal will be heard as though the device is operating in battery
mode.