TSC 900 TRANSFER SWITCH CONTROLLER
PM 151 REV 1 15/10/08 Thomson Power Systems
3.5.5. ALARMS PAGE
The alarms page displays any active alarms during operation of the ATS. A button is
provided on this page to reset all activated alarms.
The following Alarms are provided on the TSC 900
Fail to Transfer to Utility (SRC 1)
Alarm is activated if a transfer from generator (SRC 2) to utility (SRC 1) fails to
connect to the utility (SRC 1) supply within the pre-defined time period. Time delay is
programmable –see Section 5.11.16.
Fail to Transfer to Gen (SRC 2)
Alarm is activated if a transfer from utility (SRC 1) to generator (SRC 2) fails to
connect to the generator (SRC 2) supply within the pre-defined time period. Time
delay is programmable –see Section 5.11.16.
Alarm is activated if the “Load On Utility” (SRC 1) ATS signal to the TSC 900 is lost
during normal operation, while the Utility is supplying the load.
Alarm is activated if the “Load On Generator” (SRC 2) ATS signal to the TSC 900 is
lost while the Generator is running and is supplying the load.
Loss of Load Voltage -SRC 1
Contacts Open
Alarm is activated if the ATS is in the Utility (SRC 1) position and its power switching
device contacts open causing a loss of ATS load voltage.
Loss of Load Voltage -SRC 2
Contacts Open
Alarm is activated if the ATS is in the Generator (SRC 2) position and its power
switching device contacts open causing a loss of ATS load voltage.
Generator Failed to Start
Alarm is activated if the genset fails to start and reach nominal voltage and frequency
within 60 seconds from the time an engine start signal was initiated.
Alarm is activated if a transfer to alternate source is initiated and the two sources fail
to reach acceptable synchronization limits within the pre-defined time period. Time
delay is programmable –see Section 5.15.2. Alarm is only active on Transfer switches
configured for Open Transition-in Sync (Model X) or Closed Transition (Fast or Soft-
load Models 3 / 4)
Fail to External Sync Timeout
Alarm is activated if a transfer to alternate source is initiated and the two sources fail
to reach acceptable synchronization limits within the pre-defined time period. Time
delay is programmable –see Section 5.15.3. Alarm is only active on Transfer switches
configured with an external automatic synchronizer used in Closed Transition (Fast or
Soft-load (Models 3 / 4) applications.
Fail to Unload Utility (SRC 1)
Alarm is activated if during a Closed Transition Transfer sequence, the utility supply
(SRC 1) fails to unload within the pre-defined time period. Time delay is
programmable –see Section 5.15.8. Alarm is only active on Transfer switches
configured with an external load sharing controller used in Closed Transition Soft-load
(Model 4) applications.
Fail to Unload Gen (SRC 2)
Alarm is activated if during a Closed Transition Transfer sequence, the generator
supply (SRC 2) fails to unload within the pre-defined time period. Time delay is
programmable –see Section 5.15.8. Alarm is only active on Transfer switches
configured with an external load sharing controller used in Closed Transition Soft-load
(Model 4) applications.
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