TSC 900 TRANSFER SWITCH CONTROLLER
PM 151 REV 1 15/10/08 Thomson Power Systems
5.10.17. OPEN TRANSITION IN-SYNC TRANSFER (ATS MODEL X)
The Open Transition Transfer setting will appear if the ATS is ordered with an Open
Transition Transfer option (i.e. ATS Model Code Digit #13 “Operation Type” X, Open
Transition In-sync Transfer). When the option is set to YES, the ATS will operate in an
Open Transition In-sync transfer sequence dependent upon if both sources are
available. Note: the ATS will automatically revert to open transition transfer with
neutral delay should only 1 source of power be available at time of transfer. When the
option is set to NO, the ATS will only operate in Open Transition transfer mode.
5.10.18. CLOSED TRANSITION TRANSFER (CTTS MODEL 3 & 4)
When the ATS is ordered with a Closed Transition Transfer option (i.e. ATS Model
Code Digit #13 “Operation Type” 3 or 4) the ATS can be selected for closed transition
operation. When the option is set to YES, the ATS will operate in a Closed Transition
transfer sequence dependent upon if both sources are available and the specific
setting of the GHC Home Page or via external control switch (if fitted). Three operation
mode settings are provided as follows:
Fast Transfer: The two sources will be permitted to stay in parallel for a maximum
of 100 milliseconds only. Note: the ATS will automatically revert to open transition
transfer mode should only 1 source of power be available at time of transfer.
Soft-Load: The two sources will be permitted to stay in parallel for a maximum of
10 seconds only to allow loads to be ramped between the sources by an external
controller Note: the ATS will automatically revert to open transition transfer mode
should only 1 source of power be available at time of transfer.
Extended Parallel: Under normal operation, the two sources will be permitted to
stay in parallel continuously following a closed transition transfer operation. Note:
the ATS will automatically revert to open transition transfer mode should only 1
source of power be available at time of transfer.
When the option is set to NO, the ATS will only operate in Open Transition transfer
mode, irrespective of GHC Home Page or via external control switch settings.
5.10.19. NEUTRAL DELAY BYPASS
The TSC 900 transfer switch controller contains “NEUTRAL DELAY BYPASS” logic,
which allows a shorter neutral delay timer period during transfer if the load bus voltage
falls to safe levels before the transfer sequence is completed. This feature is user
programmable and allows 2 different functional settings which are described below:
NO (DISABLED): The transfer switch neutral delay period will operate as per
the Neutral Delay Timer setting.
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