Powerware 9315 User Manual download pdf (Page 39)

Po werware 9315 P arallel Redundant System I & O

164202013 Rev. D 041599

Understanding Parallel

Redundant Operation

With the parallel redundant system, the UPS system continues to function

automatically to supply AC electrical power to the critical load. There are three

operation modes in this system:

· In Normal mode, the UPS system functions normally as described in the

PowerwareR 9315 Operation manual provided with the UPS system. In the

parallel redundant system, power leaves the UPS module from its AC output

and is routed into the designated MOB in the parallel cabinet. As the system is

in Normal mode, the MOBs are closed and clean power is routed directly to the

AC output of the parallel cabinet and then to suppl y the critical load.

· In Battery mode, the battery cabinet supplies DC power, which maintains UPS

operation. The battery supports the critical load through the parallel cabinet’s

AC output.

· In Bypass mode, interunit signaling is used by each UPS to determine if its

designated MOB is closed and if the redundant module is on bypass or normal.

This information causes differences to the usual bypass operation of the UPS

system.

The following description provides the operating mode differences between the

parallel redundant and single UPS module systems.

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Powerware 9315 User Manual Page 39