TSC 80 TRANSFER SWITCH CONTROLLER
PM063 Rev 7 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 80) 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 = 31 seconds).
3.1.2.6.SERVICE ENTRANCE ATS
For Service Entrance Rated transfer switch applications, the transfer switch
control logic will include external wiring to signal the transfer switch mechanism
to move to the “Service Disconnected” position. In this mode the TSC 80
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 the UTILITY POWER FAIL
SIMULATE pushbutton on the Lexan faceplate. Hold the pushbutton on for
approximately 5 seconds until the LED light above the pushbutton changes
state. Once the mode is initiated, the engine start will be activated, once 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 on for approximately 5
seconds until the LED light above the pushbutton changes state. 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.
Содержание TSC 80
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