Initial Ups Startup Procedure; 4.4 - Ups Shutdown Procedure; Maintenance Bypass Procedure - Emerson Liebert GXT3-3000RT120 User Manual

4.3

Initial UPS Startup Procedure

1. Inspect all power connections to ensure they are correct and secure.
2. Open external circuit breakers/fused disconnects to the connected loads.
3. Close all upstream circuit breakers and fused disconnects.
4. Use a voltmeter to verify proper input voltage is present on the UPS and Bypass input terminals.
See Table 9 for the range.
5. Close the input breakers on the rear panel of the UPS (UPS input and Bypass input).
6. Turn the Maintenance Bypass Breaker to the Bypass position (remove the cover plate if
attached).
7. Use a voltmeter to verify that the proper output voltage is present on the UPS output terminals.
See Table 9 for the range.
8. Turn the Maintenance Bypass Breaker to the Off position and reinstall the cover plate..
NOTE
The maintenance bypass breaker cover must be installed behind the captive screw and the
screw must be tightened for the UPS to operate on inverter mode.
9. Use a voltmeter to verify the output voltage is NOT present on UPS output terminals.
10. Use the LCD display and control buttons to start the UPS, refer to 4.2.1 - Controls and
Messages.
11. Use a voltmeter to verify proper output voltage is present on UPS output terminals. See Table 9
for range.
CAUTION
!
Before reinstalling the hardwire terminal protective panel, follow the shutdown procedure in

4.4 - UPS Shutdown Procedure

12. Open all upstream circuit breakers and fused disconnects.
13. Reinstall the hardwire terminal protective panel.
4.4 UPS Shutdown Procedure
NOTE
Carrying out this procedure will interrupt the supply to the load.
1. Press the Menu button, select Control and press the Enter key
2. Select Turn UPS On/Off and press the Enter key
The LCD displays Turn UPS to BYPASS.
3. Press the Enter key
4. Open any external circuit breakers/fused disconnects connecting the load (if present).
5. Switch both Input circuit breakers to the Off position.
6. Ensure all circuit breakers/fused disconnects upstream of the UPS are open.
7. Ensure that all LEDs on the control panel are extinguished.
The UPS is now completely shut down.
4.5

Maintenance Bypass Procedure

1. Press the Menu button, select Control and press the Enter key
2. Select Turn UPS On/Off and press the Enter key
The LCD displays Turn UPS to BYPASS. The UPS is now on Internal Bypass Mode.
3. Press the Enter key
4. Remove the safety cover from the Maintenance Bypass Breaker and turn UPS to BYPASS.
NOTE
At this point the load is no longer protected against interruptions and disturbances on the
utility supply.
The UPS is now in Maintenance Bypass Mode. The Bypass LED on the front panel is illuminated
(amber) and the load is supplied directly from the utility.
to switch off the inverter.
to switch off the inverter (see Figure 10).
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Operation