Marathon TSC 900 - Under Frequency Dropout; Under Frequency Pickup; Over Frequency Delay (Pickup); Over Frequency Dropout

TSC 900 TRANSFER SWITCH CONTROLLER
PM 151 REV 1 15/10/08 Thomson Power Systems
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YES (ENABLED): The transfer switch neutral delay period will be bypassed if
the load bus voltage falls to safe levels before the transfer sequence is
completed.
Note: the neutral delay timer will be bypassed in either “Enabled” or “Disabled” modes
should the originating source voltage be in a de-energized (i.e. blackout) state prior to
transfer.
5.10.20. REVERT TO OPEN TRANSITION
For transfer switches equipped with close 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.
5.10.21. ENABLE TRANSFERS TO UTILITY
The TSC 900 transfer switch controller contains “ENABLE TRANSFERS TO UTILITY”
logic. This feature is user programmable and allows 2 different functional settings
which are described below:
NO (DISABLED): The transfer switch will be inhibited from transferring to the
Utility position.
YES (ENABLED): The transfer switch will be permitted to transfer to the Utility
position.
5.10.22. ENABLE TRANSFERS TO GENERATOR
The TSC 900 transfer switch controller contains “ENABLE TRANSFERS TO GEN”
logic. This feature is user programmable and allows 2 different functional settings
which are described below:
NO (DISABLED): The transfer switch will be inhibited from transferring to the
Generator position.