Liebert Vertiv GXT5, Installer/User Manual

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Installation 40
2.7.3. Connecting a Remote Emergency Power-off (REPO) Switch
The UPS includes an EPO connection in the dry-contact port. See the appropriate figure for your model in Rear
Panels on page 5 , for the location of the port.
UPS ships with a REPO jumper installed, allowing the UPS to operate as a normally-closed switch system (fail-
safe). Opening the circuit disables the UPS. To connect a REPO switch that opens the circuit to shut down the
rectifier and inverter and power-off the UPS, use a cable from the remote switch to plug into the REPO-port on
the UPS.
In normal conditions, the REPO switch cannot cut off the UPS input power. When the REPO switch trips, the
UPS generates an alarm and immediately cuts-off output power. When the emergency condition is resolved, the
UPS will not return to normal operation until you reset the REPO switch and manually power- on the UPS.
To make the cable for the REPO connection:
Figure 2-13 on the next page, shows the cable required to make the connection. We recommend using 18 AWG
to 22 AWG (0.82 mm
2
to 0.33 mm
2
) copper-core cable.
1. Remove the insulation from the end of two cables.
2. Insert the stripped end into the plug terminals 1 and 2 respectively, then press down the terminals. Make sure
that the cables are secure in the plug to prevent failure because of loose contact.
To connect a UPS to the REPO switch.
CAUTION
To maintain safety (SELV) barriers and electromagnetic compatibility, signal cables should be shielded and run
separately from power cables.
1. Connect one end of the cable to the remote switch, see Figure 2-13 .
2. Remove the factory-installed jumper from pins 7 and 8 of the dry-contact port on the UPS .
3. Connect the plug to pins 7 and 8.