Powerware 9355 User Manual

Page 35

INSTALLING OPTIONS

EATON Powerware

9355 Parallel UPS (10/15 kVA) User’s Guide

S 164201601 Rev A www.powerware.com

Strip shielded, four-wire, twisted-pair wire for CAN Bridge Card
wiring. Recommended wire size is 18 AWG maximum.

Install the CAN Bridge Card wiring between each UPS (see
Figure 24). Be sure to check correct polarity for Pins 8 and 9:

Connect SHIELD Pin 10 on all cards together.

Connect CAN H Pin 9 and CAN L Pin 8 (twisted pair) on all cards
together.

Connect COM Pin 4 and NC Pin 3 (twisted pair) on all cards
together.

Wire the factory-installed pull-chain wiring to Signal Input 2 on each
UPS and daisy chain the wiring to each UPS as shown in Figure 24.
Be sure to check correct polarity:

Connect COM Pin 4 to Signal Input 2 Pin 1 on each UPS.

Connect NC Pin 3 to Signal Input 2 Pin 2 on each UPS.

C A U T I O N

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.