GE Industrial Solutions ISM - Manual (Page 8)

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OPM_ISM_OPT_10K_M50_0GB_V021.doc Operating Manual ISM – Intelligent Synchronization Module
2 DESCRIPTION
2.1 SCB - SYNCHRONIZATION OF CRITICAL BUSES
Fig. 2.1-1 SCB – Synchronization of Critical Busses block diagram
The UPS configuration in Fig. 2.1-1 enhances security, reliability and safety of a system for the power
supply to extremely critical loads.
Basically it is composed of 4 major blocks, see Fig 2.1-1:
• UPS Group A: this group can be minimum 1, maximum 6 units.
• UPS Group B: this group can be minimum 1, maximum 6 units.
• ISM – Intelligent Synchronization Module.
ISM (Intelligent Synchronization Module) allows synchronizing of two independent groups of parallel
UPS’s, each having a maximum of 6 UPS units of equal rating from 10 – 500 kVA.
• STS – Static Transfer Switch.
A Static Transfer Switch can select between 2 sources (UPS groups).
As standard the Static Transfer Switch will supply the load from the preferred source.
In case the source would fail it will transfer the load to the second source.
A condition is that both sources are synchronized continuously, also on battery operation.
Each group of UPS’s are independent and capable to supply the full load, eventually redundant.
Each unit in the group is synchronized to its Master, which in return synchronizes to the utility voltage, if
available.