UPS 450 - 550 kVA (2x225 - 2x275 kVA)
User’s and Installation Guide
1027574
Revision B
38
Note Remote EPO switch rating is 24 Vdc, 1 A minimum.
Note Remote EPO normally-open and normally-closed return terminals are separated on the terminal board, but are
electrically in common.
Figure 3-13. Normally-Open remote EPO switch wiring
10. If you are installing multiple remote EPO switches, wire additional switches in parallel with
the first remote EPO.
11. If required, install wiring from the remote EPO switch to the trip circuitry of the upstream
protective devices. A normally-open (NO) contact is provided between terminals 6 and 7
of the remote EPO switch, as shown in Figure 3-12. Remote EPO switch wiring must be in
accordance with UL Class II requirements.
12. When all wiring is complete, reinstall the small top internal safety shield panel and secure
with the cabinet mounted screws.
13. Reinstall the center front panel removed in previous steps and secure with the retained
hardware.
14. Figure 3-14 and Figure 3-15 show alternative methods of connecting a remote EPO switch if
using another manufacturer’s switch.
Note Remote EPO switch rating is 24 Vdc, 1 A minimum.
Note Remote EPO normally-open and normally-closed return terminals are separated on the terminal board, but are
electrically in common.
Figure 3-14. Normally closed remote EPO switch wiring
