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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.
3.11.1 Cabinet installation
Connect all the UPS needed to be put into parallel system as below picture.
Make sure each UPS input switch is in "off" position and there is no any output from each
UPS connected. Battery groups can be connected separately or in parallel, which means the
system itself provides both separate battery and common battery.
CAUTION!
A group of parallel systems is equivalent to a large capacity UPS, but it
has higher reliability. In order to ensure that all UPS machines are
current sharing, and comply with the relevant wiring rules, the following
requirements should be met:
◆ All UPS must be the same rated and connected to the same way bypass power supply.
◆ Bypass and the mains input power must be received with the same neutral.
◆ The output of all UPS machines must be connected to a common output bus.
◆ All bypass input cables and UPS output cables should be of the same length and
specification, which is to make the machine operate in the bypass mode and compare the
current sharing
3.11.2 Parallel cable installation
Shielded and double insulated control cables available must be interconnected in a ring
.
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