IV404E Rev.000 SIEL S.p.A.
Issue date: 2017-06-05 Pag. 35 di 90 + FR
3.3.7 Dual Bus System
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UGS (optional)
Two independent systems may be configured with Dual Bus with a single source or a separate source.
The synchronization option (UGS) keeps the outputs of the two systems always synchronized, regardless of
the input variations and when the system is running from the battery. Each system may be made up of a
maximum of 4 parallel-connected UPSs. This system has been designed for configurations using STSs (Static
Transfer Switches) since this guarantees switching from one uninterruptible source to another without
affecting the loads.
