Eaton 9355 - Page 74

Parallel Communication
66 Eaton 9355 UPS (20/30kVA) Installation and Operation Manual 164201626—Rev F www.eaton.com/powerquality
11. Wire the pull-chain wiring to Signal Input 2 on each UPS and daisy chain the wiring to each UPS as shown
in Figure 52. Be sure to check correct polarity:
l
Connect Pull-Chain Output Contact Pin 1 to Signal Input 2 Pin 1 on each UPS.
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Connect Pull-Chain Output Contact Pin 2 to Signal Input 2 Pin 2 on each UPS.
CAUTION
If polarity or wiring is not correct, the parallel system does not operate normally. For example, when
shutting down one UPS, the remaining UPS transfers the load to bypass instead of supporting the load.
Verify all CAN Bridge Card wiring is correct for proper operation.
Note: Signal Input 2 can still be used for building alarms; it is automatically rerouted to the CAN Bridge
Card.
12. Reinstall the communication wiring access plate on each UPS.
13. Replace the UPS front door on each UPS.