TSC 900 TRANSFER SWITCH CONTROLLER
PM 151 REV 1 15/10/08 Thomson Power Systems
5.15.8. FAIL TO UNLOAD TIMER (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 time delay feature is
available. When the Fail to Unload alarm feature is enabled (refer to Section #5.10.3),
this timer is programmed to allow the desired amount of time for a normal soft-unload
process to occur following a closed transition transfer operation. Should the pre-
programmed time expire before the source “unloaded” confirmation digital input signals
are received transfer during a closed transition, an alarm will be posted. The alarm
shall also activate the common TSC 900 "Transfer Fail" alarm output.
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