Maintenance Bypass Procedure; Return From Maintenance Bypass Procedure; Functional Test - Liebert GXT3-10000T230 User Manual

4.6

Maintenance Bypass Procedure

1. Press the Menu button, select Control and press OK.
2. Select UPS ON/OFF and press OK.
The LCD displays To BYPASS.
3. Press OK to switch Off the inverter and transfer to internal bypass.
4. Remove the safety cover from the Maintenance switch, and turn On the Maintenance Bypass
Breaker.
NOTE
At this point, the load is no longer protected against interruptions and disturbances of the
mains.
5. Switch output and input switches to the Off position.
6. The UPS is now switched Off, all LEDs are Off and the load is supplied directly from the mains.
4.7

Return from Maintenance Bypass Procedure

1. Ensure all switches and circuit breakers upstream of the UPS are closed.
2. Switch both input switches to the On position.
3. Wait at least 30 seconds until the output voltage has stabilized (the yellow LED is lit).
4. Switch the Maintenance switch from BYPASS to UPS and replace the cover. The load is now
supplied via internal bypass.
5. Press the Menu button, select Control and press OK.
6. Select UPS ON/OFF and press OK.
The LCD displays UPS to ON.
7. Press OK to switch On the inverter.
4.8

Functional Test

NOTE
Supply to the load is not guaranteed during this test. The test should not be carried out if a
critical load is connected to the UPS.
The Liebert GXT3-10000T230's controls permit testing the UPS to ensure that the load will be sup-
plied in the event of a mains failure.
Before beginning, ensure that the batteries are fully charged.
Simulate a mains failure by interrupting the mains supply to the UPS. You can do this by switching
Off the input power circuit breaker on the rear panel of the UPS. If the mains supply to the Liebert
GXT3-10000T230 is protected by an external circuit breaker, opening that circuit breaker will inter-
rupt the mains supply and simulate a power failure.
The Liebert GXT3-10000T230 is operating properly and the batteries are charged if:
• An audible signal is heard at four-second intervals
• The UPS On LED indicator turns Off
When the interval between the audible signals decreases to 10 seconds, the UPS has battery reserve
energy to supply the load for a maximum of two more minutes. After two minutes, the Liebert GXT3-
10000T230 will automatically shut down.
If the batteries do not supply the load during the simulation, refer to 7.0 - Troubleshooting. To end
the simulated mains failure, restore the input power supply to the UPS. The UPS is now ready for
operation.
NOTE
The batteries must be recharged before the complete emergency supply period is again
available.
21
Operation