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EATON Powerware
®
9155 Parallel UPS (8–15 kVA) User’s Guide S 164201592 Rev C www.powerware.com
1
Chapter 1 Introduction
A parallel system with up to three uninterruptible power supplies (UPSs)
can be installed to provide a parallel capacity and/or redundant system.
This load sharing system provides more capacity than a single UPS and
can provide backup, depending on the load and configuration. In
addition, when one UPS is taken out of service for maintenance or is not
operating properly, a redundant UPS continues to supply uninterrupted
power to the critical load. A parallel Powerware
®
Hot Sync
®
Contoller
Area Network (CAN) Bridge Card provides connectivity for system
metering and operational mode control. The parallel system consists of
two or three UPSs, each with a CAN Bridge Card and a parallel tie
cabinet.
Figure 1 shows the Powerware 9155 UPS and an optional Extended
Battery Module (EBM).
Figure 1. The Powerware 9155 UPS and EBM (2-High Cabinets Shown)