9 COMMUNICATION
9.1 Communication Interface Port
The Liebert GXT3 UPS has a terminal block on the rear of the UPS unit. Several signals are provided on this port and are
assigned as follows.
9.2 Terminal Block
The terminal block includes eight pins, as shown in Figure 9.1 below.
Figure 9.1 Terminal block communication pin layout
9.2.1 Any-Mode Shutdown
The purpose of Any Mode Shutdown is to shut down the UPS output by turning Off the rectifier, inverter and static switch so
that there is no power to the loads.
Any Mode Shutdown can be operated locally or remotely:
• Local Any Mode Shutdown can be performed by shorting the pins in Set 3.
• Remote Any Mode Shutdown can be performed using a switch connected to the pins in Set 3 and mounted at a
remote location.
Activation of the Any Mode Shutdown will be logged as an event in the event history log.
NOTE: Remote Power Off will be performed either by NO or NC contact of Any Mode Shutdown. The current limited
source for the optocoupler (+12VDC, 50mA) will be available from UPS. The connection to UPS for remote connection
will be via terminal block connector. Any Mode Shutdown wiring must conform to all national, regional and local
wiring codes and laws.
WARNING! When the Auto-enable output option is selected and the UPS output is disabled using the pins in
Set 3, the Liebert GXT3’s output can turn On automatically and without warning if the connection of the pins
in Set 3 is changed.
9.2.2 Battery Mode Shutdown
Battery Mode Shutdown permits shutting down the UPS by turning off the rectifier, inverter and static switch so that there is
no power to the load when the UPS is On Battery. The auxiliary power for the UPS will still be active.
Battery Mode Shutdown can be performed locally or remotely:
• Local Battery Mode shutdown can be performed by shorting the pins in Set 4.
• Remote Battery Mode Shutdown can be performed using a switch connected to the pins in Set 4 and mounted
at remote location.
Activation of the Battery Mode Shutdown will be logged as an event in the event history log.
Vertiv | Liebert® GXT3 ™ Installer/User Guide | 43
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