1027212
UPS 225 - 275 kVA/300kVAPF0.8
41
Revision E
User’s and Installation Guide
4.8 Installing a remote EPO switch
NOTE
This switch must be a dedicated switch not tied into any other circuits.
This procedure is intended to be used for the installation of the Eaton remote EPO switch. If
installing another manufacturer’s switch, only use this procedure as a guide.
A remote EPO switch can be used in an emergency to shut down the UPS and remove power to the
critical load from a location away from where the UPS is installed. Figure 4-13 shows a remote EPO
switch.
1.
Securely mount the remote EPO switch. Recommended locations include operator’s consoles or
near exit doors. See Figure 3-7 on page 15 for enclosure dimensions and wiring knockouts.
2.
Verify the UPS system is turned off and all power sources are removed. See Chapter 7: “UPS
operating instructions” for shutdown instructions.
3.
Unfasten the front door latch and swing the door open (see Figure 4-2 on page 26).
4.
Remove the door. Remove the retaining screw located inside the door at the bottom hinge pivot
point, then lift the door off. Retain the hardware for later use.
5.
If installing interface wiring through the left interface entry conduit landing, proceed to Step 6;
otherwise, proceed to Step 8.
6.
If not already accomplished, remove one top screw and two bottom screws securing the UPS left
front panel (see Figure 4-2 on page 26). Lift the panel straight up to remove it from the panel
hanger bracket at the top of the cabinet.
7.
Remove the screws securing the protective cover panel and remove the panel. Retain the
hardware for later use.
Figure 4-13. Remote EPO switch
8.
To gain access to terminal blocks TB1 and TB2 and the interface entry plates, loosen the screws
securing the protective cover panel and remove the panel. This panel is to the right of the X-Slot
communication bays (see Figure 4-8 on page 35).
9.
Remove the UPS cabinet interface entry plates to drill or punch holes (see Figure 4-4 on page 30).
10. Reinstall the interface entry plates.
11. To locate the appropriate terminals and review the wiring and termination requirements, see
Table 4-1 on page 38, and Figure 4-8 through Figure 4-10.
12. Route and connect the wiring as shown in Table 4-2 and Figure 4-14.
13. If the normally-closed Remote EPO TB1 connection in the UPS is not used, connect a jumper wire
between pins 1 and 2 on TB1.
