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3.9.2 Parallel cable installation
Shielded and double insulated control cables available must be interconnected in a ring
configuration between UPS modules as shown below. The parallel control board is mounted
on each UPS module. The ring configuration ensures high reliability of the control.
3.9.3 Requirement for the parallel system
A group of paralleled modules behave as one large UPS system but with the advantage
of presenting higher reliability. In order to assure that all modules 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 Bypass and the Main input sources must be referenced to the same neutral
potential.
