American Power Conversion 240-320kW 400V manual Intersystem Synchronization Unit

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6.3Intersystem Synchronization Unit

Intersystem Synchronization Unit System (ISU System)

The ISU system consists of inter-connected ISUs. One ISU system may consist of up to 5 ISUs, regardles of ISU configuration. The ISU system synchronizes the voltage of parallel operation systems running in battery operation.

The ISU system may also include one or more external synchronization sources, e.g. a gen-set or a non-APC Silcon UPS system.

Synchronization accuracy of the ISU is better than 2o.

Schematic overview of ISU system (example):

UPS 1A

UPS 3A

UPS 1B

Parallel

Operation

System 1

ISU

1

ISU

3

Parallel

Operation

System 3

UPS 1C UPS 2A

ISU System

UPS 3C

UPS 2B

Parallel

Operation

System 2

ISU

2

ISU

4

ISU

5

UPS 2C

UPS 4

Ext. sync Source

UPS 3B

Intersystem Synchronization Unit (ISU)

The ISU is an active part of an ISU system, serving as the interface to the sources and the ISU system.

The ISU can be connected to a parallel UPS configuration, using the standard parallel communication controller in the parallel operation system.

(See Intersystem Synchronization Unit User’s Manual for further details.)

990-4045a

56 Installation Guide APC Silcon 240-320kW 400V UPS