IV420E Rev.00 SIEL S.p.A.
Installation and user manual
Date of issue: 2019-01-29
Pag. 21 di 72+ FR
3.9.3 Requirement for the parallel system
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.
3.10 LBS installation
LBS system contains LCD set, commucation cable and STS device.
3.10.1 LCD setting
Set every UPS of the systems to be LBS Master or LBS Slave. For instance if the UPS
belongs to LBS master system, its LBS setting must be set to Master.
3.10.2 LBS cable installation
The two ports of one mesh wire should be plug into RJ45 interface of any one UPS of both
master and slave system.
Summary of Contents for 50-200kVA PF-1 UPS
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