WAVEGUIDE PRESS/HUMID
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
Waveguide Pressurization Unit UD6 supplies
dry air for the waveguide and Spectrum filter. Waveguide pressure
and humidity (equipped with a solid state humidity
alarm system) sensors detect malfunctions or conditions that offset
pressurization and sends these detected faults to the Control and Monitoring
circuits. This alarm is set whenever the pressure or humidity are
out of tolerance. This alarm will show up on the Fault Display Panel
as a Maintenance Required alarm, it will not shutdown the transmitter.
SIGNAL SOURCE
The source of the Waveguide Press/Humid signal (W/G HUMIDITY FAULT)
originates at the Waveguide Pressurization Unit UD6. The signal W/G
HUMIDITY FAULT leaves UD6 via Utilities Junction Box 7A1 and continue on
to the Data Acquisition Unit (DAU), where it is routed to the Transmitter
UD3 at J3.
SIGNAL DESTINATION
W/G HUMIDITY FAULT enter Control and Monitoring at J21-5 on the Control
Card Rack A3 as WGHUMAL (see figure 11-7 sheet 10). It then change
its name to W/G HUMIDITY as it enter the RMS Interface card A3A3 where
it is place on the Fault Bus during Port06EN- as Transmitter Data (TDATA).
It also leaves the RMS Interface card at bubble 1021-1 and goes to the
Fault Display Panel A1A1 (see figure 11-7 1) at bubble 1021 to light the
lamp for Maintenance Required Waveguide Press/Humid.
LIMITS AND FAULTS
The Pressurization Unit puts out dried air with a
pressure of 3 psi nominal for
use in other waveguide applications beside the Spectrum filter. This
alarm is set whenever the pressure on the waveguide decline to 1.5 psi,
or the humidity for any reason rise to 2% RH (relative humidity).
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