• 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.
5.11.17. REVERT TO OPEN TRANSITION
For transfer switches equipped with closed transition transfer feature, the TSC 900
controller contains “REVERT to OPEN TRANSITION” logic. This logic allows the user to
select how the ATS operates should the closed transition transfer operation fail to
achieve an “in-sync” condition. This feature is user programmable and allows 2 different
functional settings which as described below:
NO (DISABLED): The ATS will not automatically revert to open-transition
transfer should the closed transition transfer operation fail to achieve an “in-sync”
condition. The ATS will remain in its last position in an alarmed state. If the alarm
is reset, the ATS will re-attempt a closed transition transfer operation sequence.
YES (ENABLED): The ATS will automatically revert to open-transition transfer
should the closed transition transfer operation fail to achieve an “in-sync”
condition for the allowed “in-sync wait” time delay period.
5.11.18. ENABLE FAIL TO UNLOAD ALARM (CTTS MODEL 4)
When the ATS is ordered with a Closed Transition soft-load option (i.e. ATS Model Code
Digit #13 “Operation Type” 4), a fail to unload alarm feature is available. When feature is
set to “Yes”, the TSC 900 controller will monitor the status of programmable inputs
configured for Utility unloaded (DI-12) and Generator unloaded (DI-13). When enabled,
it will post an alarm when the selected source fails to unload after expiry of the Fail to
Unload timer (programmable per Section 5.16.3) following a soft-load power transfer.
The alarm will also activate the common TSC 900 "Transfer Fail" alarm output.
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