Eaton Powerware 9390 Specifications download pdf (Page 60)

Understanding IAC Operation

4-4

EATON Powerware

9390 IAC-B and IAC-T Installation and Operation Manual S 164201590 Rev C powerware.com

4.2.2 Redundant Operation with Maintenance Bypass – UPS Mode

The MOBs provide redundant power to the critical load through the MIS. The wraparound

MBP is open.

Figure 4-4 shows the path of electrical power through the IAC during redundant operation

when bypass is in UPS mode.

OUTPUT TO

CRITICAL LOAD

IAC

MIS MBP

MAIN POWER FLOW IN UPS MODE

MAIN POWER FLOW IN MAINTENANCE BYPASS MODE

MOB 1

MOB 2

FROM UPM 1

OUTPUT

FROM UPM 2

OUTPUT

AC INPUT TO

BYPASS FROM

UTILITY

Figure 4-4. Path of Current Through the IAC during Redundant Operation in UPS Mode

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Eaton Powerware 9390 Specifications Page 60