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4.7.4
Generator Interface Connections
If ESS is enabled and the UPS will be fed by a site generator at any time, the On Generator building alarm must
be wired and configured to a Building Alarm Input. Wiring the On Generator sensing circuit to a building alarm
allows the UPS to optimize its operation with the generator by transferring the UPS from ESS mode to Normal
(double conversion) mode.
NOTE 1
NOTE 2
NOTE 3
NOTE 4
NOTE 5
To Install wiring:
1.
Verify the UPS system is turned off and all power sources are removed. See Chapter 6, "UPS Operating
Instructions, " for shutdown instructions.
2.
If not already opened, open the front door by lifting the latch from the bottom and turning to the right
(counterclockwise) and swing the door open.
3.
If wiring the interface terminals from the bottom of the UPS, proceed to Step 8; otherwise, proceed to
Step 4.
4.
Top Entry Wiring. Remove the top interface entry conduit landing plates to drill or punch holes (see
Figure 4-4).
5.
Reinstall the interface entry plates and install the conduit.
6.
Route the UPS building alarm interface wiring through the top interface entry conduit landing plates to the
UPS building alarm terminals. See Figure 4-4 for wiring access information, and Figure 4-9 and Figure 4-10
for UPS interface terminal locations.
7 .
Proceed to Step 13.
8.
Bottom Entry Wiring. Remove the bottom interface entry conduit landing plates to drill or punch holes
(see Figure 4-11).
9.
Reinstall the interface entry plates and install the conduit.
10. Route the UPS building alarm interface wiring through the bottom interface entry conduit landing plates to
the bottom access interface wiring channel along the inside of the front door (see Figure 4-11).
11. Route the wiring along the interface wiring channel (see Figure 4-11) to the UPS building alarm terminals.
See Figure 4-9 and Figure 4-10 for UPS interface terminal locations.
12. Secure the wiring to the wire tie anchors provided (see Figure 4-12) using Zip ties.
13. Connect the building alarm interface wiring to the building alarm terminals. See paragraph 3.2.4 and
Table 4-1 for wiring and termination requirements, and Figure 4-13 for terminal assignments.
14. If wiring external parallel CAN connections, proceed to paragraph 4.7 .5; if wiring external parallel pull chain
connections, proceed to paragraph 4.7 .6; if wiring Minislot connections, proceed to paragraph 4.7 .7; if
wiring REPO connections, proceed to paragraph 4.8; otherwise, proceed to Step 15.
15. Close the UPS outside door and secure the latch.
Eaton 93PM UPS (20–50 kW, 480V Four Wire – 50 kW Frame) Installation and Operation Manual P-164000540—Rev 4
An UPS building alarm input is used to indicate On Generator.
Any pair of unused building alarm terminals may be used for On Generator
connections.
Program the building alarm to read On Generator and for either Normally Open
(default) or Normally Closed as required by the generator sensing output.
If installing interface wiring connections between standalone cabinets, conduit
must be installed between cabinets.
Disconnect terminal block plugs from terminal blocks to wire plugs.
UPS System Installation
www.eaton.com/powerquality
4-23
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