TSC 80e TRANSFER SWITCH CONTROLLER
PM091 Rev 1 09/02/27 Thomson Technology
17
Transfer Neutral to Source– “Find Neutral/Source Timer” starts timing as soon
as the Neutral Delay timer times out. During this period the motor is energized
and moves the mechanism from the neutral to the alternate source. The power
to the ATS motor will be de-energized when either the mechanism’s limit switch
activates (i.e. external logic to the TSC 80e) or the “Find Neutral/Source Timer”
times out (whichever occurs first). Note: During the above 2 sequences the
“Transfer Fail Alarm” logic is inhibited. Once the 2 sequences have been
completed, the “Transfer Fail Alarm” logic will be re-enabled and will only be
triggered if conditions as described in item A (Normal Steady State Condition)
are sensed (limit switch and/or loss of load voltage).
For example, if the ATS mechanism fails to move (i.e. due to broken rod, motor
failure or manual release plunger not re-engaged), the total time before a
transfer fail will be initiated is 31 seconds (i.e. Find Neutral/Source Timer” (10
sec) + Find Neutral/Source Timer” (10 sec) + Limit Switch Failure & Loss of
Load Voltage <80VAC (11 sec) = 31 seconds Total).
3.1.2.6.SERVICE ENTRANCE ATS
For Service Entrance Rated transfer switch applications, the transfer switch
control logic will include external wiring from the TSC 80e to signal the transfer
switch mechanism to move to the “Service Disconnected” position. In this mode
the TSC 80e transfer control outputs and Transfer Fail feature is disabled.
3.2. TEST MODES
3.2.1. UTILITY POWER FAIL SIMULATION (LOAD TEST)
To simulate a utility power failure condition, press and hold the “UTILITY
POWER FAIL SIMULATE” pushbutton on the Lexan faceplate until the LED
light above the pushbutton changes state, approximately 5 seconds. Once the
mode is initiated, the engine start will be activated, when the engine
accelerates to nominal voltage and frequency levels, the load will automatically
transfer to the generator supply. To terminate the Utility Power Fail Test Mode,
the Test pushbutton must be held until the LED light above the pushbutton
changes state, approximately 5 seconds. When the pushbutton is released the
LED light will go out and, the load will re-transfer back to the utility supply
following expiry of the Utility Return delay timer.
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