Eaton Powerware 9390 Specifications download pdf (Page 57)

4-1

EATON Powerware

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

Chapter 4 Understanding IAC Operation

The Integrated Accessory Cabinet (IAC) can be configured for maintenance bypass, parallel

redundant, or parallel redundant with maintenance bypass operation.

4.1 Maintenance Bypass Configuration

4.1.1 UPS Mode

When the maintenance bypass switch (MBP) is open and the maintenance isolation switch

(MIS) is closed, conditioned and protected power from the UPS is routed through the MIS

to the critical load.

If the optional bypass input breaker (BIB) is installed, power is supplied to the UPS through

the BIB, and the UPS rectifier and bypass input terminals are jumpered together. If the

optional BIB and rectifier input breaker (RIB) are installed, the UPS rectifier is supplied

power through the RIB and the UPS bypass is supplied power through the BIB, for a dual

feed system. In a single feed system, the BIB and RIB input terminals are jumpered together

and power is supplied to the UPS rectifier and bypass input terminals from a single source.

Figure 4-1 shows the path of electrical power through the IAC when operating in UPS

mode.

AC INPUT TO

UPS FROM

UTILITY

OUTPUT TO

CRITICAL LOAD

IAC

RIB

(OPTIONAL)

BIB

(OPTIONAL)

MIS

MBP

AC INPUT TO

BYPASS FROM

UTILITY

TO UPS RECTIFIER

INPUT

FROM UPS OUTPUT

TO UPS BYPASS

INPUT

MAIN POWER FLOW IN UPS MODE

MAIN POWER FLOW IN MAINTENANCE BYPASS MODE

Figure 4-1. Path of Current Through the IAC in UPS Mode

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Eaton Powerware 9390 Specifications Page 57