Emerson 30-200kVA Manuel D’Utilisation

Multi-module UPS are formed by several “single unit” UPS modules to constitute “1+N”system where 

groups of one or more, up to six, single units operate together for the purpose of providing additional 

power or reliability or both. The load is equally shared between any paralleled UPS.

Further, single unit or 1+N groups may be configured as “distributed redundant” systems with inde-

pendent outputs that nevertheless are synchronised through a Load Bus Synchroniser (LBS) so that 

critical loads can be seamlessly transferred from one system to another. See 6.3 - Modes of Opera-

tion for more information.

1. The hardware and firmware of single module UPS units is completely compatible with the 

requirements of a multi-module system. Multi-module configuration is achieved merely through 

settings in configuration software and control cables. 

2. Parallel control cables are connected in a ring, providing both performance and redundancy. 

Dual-bus control cables are connected between any two UPS modules of each bus. The intelligent 

paralleling logic provides the user with maximum flexibility. For example, shutting down or 

starting up UPS modules in a parallel system can be done in any sequence. Transfers between 

Normal and Bypass modes of operation are synchronised and self –recovering e.g. following 

overloads and their clearance. 

3. The total load of the multi-module system can be queried from each module’s LCD.