CIRCULATOR TEMP
CONTENTS
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BACKGROUND
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SIGNAL SOURCE
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SIGNAL DESTINATION
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LIMITS AND FAULTS
BACKGROUND
The Circulator Waveguide assembly protects
the transmitter from excessive reflected power by shunting reflected power
into a medium power termination designed to dissipate the reflected power
as heat. A thermal sensor switch is attached to the power termination
and if reflected power becomes excessive, the switch opens, removing the
28 volt input to the transmitter causing a shutdown.
SIGNAL SOURCE
The source of the +28 volts signal originate at the Data Acquisition
Unit's (DAU). The Circulator Overtemperature signal (CIRCO/TIL) from
the DAU enter Control and Monitoring at the Transmitter RMS Interface A3A3
(see figure 11-7 sheet 9).
SIGNAL DESTINATION
Signal CIRCO/TIL leaves bubble 924-17 and appears on figure 11-7 sheet
17 where it goes to figure 11-11 sheet 2. When 28 volts is removed, K5
relay will de-energized. K5 is one of four relays needed to
energize the three phase relay K1 such supplies power the A2 (280 volt
power supply) and the RF ampilier. CIRCO/TIL will also be placed
on the Fault Bus at Port02EN-, as Transmitter Data (TDATA), it also exit
bubble 905-11 to remove Transmitter Available at 905 (see figure 11-7 sheet
11). After changes it's name to CIRC O/T and ANTSFTYSW- on the backplane
it leaves at bubble 911-1 for the A1A1 Fault Display Panel (see figure
11-7 sheet 1). There at bubble 911 signal CIRC O/T goes out to light
the Circulator Temp lamp.
LIMITS AND FAULTS
There is one adjustment on the Medium Power
Terminator which is not addressed in any of the EHBs. If you
are having a problem with Circulator Temp alarms and the Waveguide system
are correct (no damage parts), try turning the adjustment in a clockwise
direction for approximately one quarter turn to ensure you are able to
fire the transmitter using RDASOT. Next, ensure you are measuring
700 KW +/- 50 KW in long and short pulse at the output of the Klystron
as described in the EHB 6-511 transmitter alignment procedure. While
firing the transmitter, turn adjustment on the Medium Power Terminator
in a Counter-clockwise until the fault lamp for Circulator Temp comes on.
Then turn it back clockwise for approximately a quarter of a turn from
the threshold.
Transmitter Start
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