INFOSEC UPS SYSTEM – 15, Rue du Moulin – 44880 Sautron – France – www.infosec-ups.com
Hot Line Tel : +33 (0)2 40 76 15 82 – fax : +33(0)2 40 94 29 51 – hotline@infosec.fr – 02 19 AA 59 203 07
Make sure the utility input & output wiring is correct. The current spec, color, position, connection and
conductance reliability of wire must be checked carefully. Make sure the L/N terminal is correct, not
reverse or short-circuited. Make sure the sequences are correct.
2-6. UPS Installation for Parallel System
Warning
The input harmonic current distortion will be between 3% and 4.5% in parallel UPS operation.
You need one parallel kit for every two UPS systems.
2-6-1. Input and output wiring
1. When installing the system in parallel, the length of the input wires (R, S, T, N) in one of the UPS parallel
system must be equal to the length of the input wires of the other UPS. Likewise, the length of output wires
(R, S, T, N) must also be in equal length. Otherwise, it will generate an unbalanced current on the output
load.
2. Refer to section “2-5. Single UPS Installation” for the input and output wiring and battery wiring methods.
Dual input wiring in parallel system
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