TSC 7320 Transfer Switch Controller
PM180 REV 0 23/02/10 Thomson Power Systems
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4.4.1. Open Transition IN-SYNC Transfer Operation (Model X)
If the ATS is supplied with ATS Model X feature (i.e. Open Transition – In-sync Transfer),
the ATS will operate as per automatic sequence of operation (open transition) however
all transfers will occur using in-sync transfer control sensing instead of neutral delay
control logic. All In-sync transfer operations will occur only when both sources of power
are available and within normal operating limits.
NOTE: Open Transition In-sync Transfer operation is only possible if the ATS
mechanism is equipped for in-sync operation and the wire connecting the controllers
input E (PIN 52) to the DC negative terminals is removed. see SECTION 5.6.1 for more
information
4.4.2. CLOSED TRANSITION REANSFER (FAST TRANSFER MODEL 3)
If the ATS is supplied with Closed Transition Transfer - Fast Transfer (i.e. Model 3)
features, the Closed Transition control selection will be provided using an External
Switch. The external switch has two positions and will allows the user to select between
closed transition operation, and open transition operation.
Note: changing the position of the switch will affect the following and subsequent
transfers.
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