Manual de operaciones
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5.8 UPS parallel Installation
A group of paralleled UPS behaves as one large UPS system but with the advantage of presenting higher
reliability. In order to assure that all UPS are equally utilized and comply with relevant wiring rules, please follow
the requirements below:
1.
All UPS must be of the same rating and be connected to the same bypass source.
2.
The outputs of all the UPS must be connected to a common output bus.
3.
The length and specification of power cables including the bypass input cables and the UPS output
cables should be the same. This facilitates load sharing when operating in bypass mode.
The basic installation procedure of a parallel system comprising of two or more UPS modules is the same as that
of single module system. The following sections introduce the installation procedures specified to the parallel
system.
Cabinet installation
Connect all the UPS needed to be put into parallel system as below picture (Fig. 5-6).
Fig. 5-6 Parallel system
Battery groups can be connected separately or in parallel, which means the system itself provides both separate
battery and common battery.
Parallel cable installation
Shielded and double insulated control cables available must be interconnected in a ring configuration between
WARNING
Before start the module, the module_ON switch must on the "ON" status and the red indicator must flash or
off.
Before remove the module, the module_ON switch must on the "OFF" status and the red indicator must light.
modules starts.
