Eaton Powerware 9390 Specifications download pdf (Page 59)

Understanding IAC Operation

4-3

EATON Powerware

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

4.2 Parallel Redundant Configuration

Refer to the applicable Powerware 9390 Installation and Operation manual, listed in

paragraph 1.5, for detailed parallel theory of operation.

4.2.1 Redundant Operation

The IAC in redundant configuration allows two UPMs to be c onnected with the outputs in

parallel (tied together) to provide redundancy in a 1+1 configuration. Each UPM shares the

load equally. If one UPM should fail, the remaining UPM assumes the entire load. In a 1+1

redundant configuration the maximum load is equal to the maximum load of one UPM

only.

The module output breakers (MOBs) provide a method of isolating one UPM when service

or maintenance is required. The system load breaker (SLB) provides c onvenient control of

the output to the critical load.

Figure 4-3 shows the path of electrical power through the IAC during redundant operation.

OUTPUT TO

CRITICAL LOAD

IAC

MOB 1

MOB 2

SLB

(OPTIONAL)

FROM UPM 1

OUTPUT

MAIN POWER FLOW

FROM UPM 2

OUTPUT

Figure 4-3. Path of Current Through the IAC during Redundant Operation

1 2 ... 54 55 56 57 58 59 60 61 62 63 64 ... 145 146

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Eaton Powerware 9390 Specifications Page 59