TSC 900 TRANSFER SWITCH CONTROLLER
PM 151 REV 1 15/10/08 Thomson Power Systems
4.8. MANUAL UTILITY RETRANSFER CONTROL
If the TSC 900 is pre-programmed to provide a Manual return to the utility supply following a
utility power failure, an operator can decide when to initiate the re-transfer sequence by
pressing the “”MANUAL RETURN” button when displayed on the GHC Home page as shown
below.
NOTE:
The manual re-transfer sequence will only be initiated if the
button is pressed and the utility supply (source 1) is at nominal
voltage and frequency levels.
4.9. SERVICE DISCONNECT MODE
For transfer switches equipped with the Service Entrance Mode option, the TSC 900 is
configured to provide additional logic for the application. When the TSC 900 controller
receives an input signal from the door mounted Service Disconnect switch to transfer to the
neutral position, the TSC 900 control outputs will change state to cause the ATS mechanism
to move to the neutral position. The ATS operator must wait ~2 seconds to allow the ATS to
move to the neutral position before selecting the “Disconnected” position. When the Service
Disconnect switch is moved to the “Disconnected” position, all transfer logic control outputs
from the TSC 900 are disconnected and the engine start signal is disabled. When the Service
Disconnect switch is returned to the “Energized position, the TSC 900 control outputs are re-
connected and will change state to cause the ATS mechanism to transfer back to the Utility
position.
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