Apc SILCON 990-4053 User Manual download pdf (Page 56)

56 Installation Guide APC Silcon 480kW 400V UPS

990-4053

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6.3 Intersystem 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 2

Schematic overview of ISU system (example):

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.)

ISU System

Parallel

Operation

System 3

Parallel

Operation

System 2

Parallel

Operation

System 1

Ext.

sync

Source

UPS 2C

UPS 2B

UPS 2A

UPS 1C

UPS 1A

UPS 1B

UPS 3C

UPS 3A

UPS 3B

UPS 4

ISU

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Apc SILCON 990-4053 User Manual Page 56