3.4.3. DUAL SOURCE ATS
ATS may be supplied with the following 3 types of optional Dual Source system
configurations:
• DU - Dual Utility ATS: Used for systems consisting of one ATS connected to two
utilities with at least one source continually energized to the ATS. ATS will
automatically switch to the alternate source upon failure of the preferred source.
• DPG - Dual Prime Gen ATS: Used for systems consisting of one ATS connected to
two generators with one generator continually energized to the ATS. ATS will
automatically switch to the alternate generator upon failure of the preferred source.
• DSG - Dual Standby Gen ATS (Slave ATS): Used for systems consisting of two
ATS's in a Master/Slave Configuration. Refer to the following diagram. Only the
"Slave" ATS is to be ordered and configured with the “DSG” option. The Master ATS
is to be ordered as a standard ATS. The "Slave" ATS will be connected to two
generators which are normally de-energized and are signaled to start from the Master
ATS.
3.4.3.1. DUAL UTILITY ATS
A Dual Utility application allows an operator to select which source is “preferred”
(i.e. Either source may be selected as Preferred), therefore, the alternate source
will act as the standby source. The “PREFERRED” selected source will
continuously operate on load. The non-selected preferred source (standby) will
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