WAVEGUIDE PRESSURE

• BACKGROUND
• SIGNAL SOURCE
• SIGNAL DESTINATION
• LIMITS AND FAULTS

 

 
 
 

BACKGROUND


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The Waveguide Pressurization Unit UD6  supplies dry air for the waveguide and Spectrum filter to decrease chances for it to arc.  It consist of a compressor and pressure tank with supporting controls and valves.  It is capable of producing very dry air at an output rate of 5 SCIM (Standard Cubic Inches per Minute) at a pressure of 5 PSIG (Pounds per Square Inch Gauge).  It is a Lightweight unit (58 lbs.) designed for wall mounting and is used to keep the waveguide components internal dry.
 

SIGNAL SOURCE


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The source of the Waveguide Pressure signal (W/G PRESSURE FAULT) originates at the Waveguide Pressurization Unit UD6.  The signal W/G PRESSURE FAULT leaves UD6 via Utilities Junction Box 7A1 and  continue on to the Digital Analog Unit (DAU), where it is routed to the Transmitter UD3 at J3.
 

SIGNAL DESTINATION


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W/G PRESSURE FAULT  enter Control and Monitoring at  J21-4 on the Control Card Rack A3 as WGPRESSAL (see figure 11-7 sheet 9).  WGPRESSAL then change its name to W/GPRESS as it enter the RMS interface card A3A3 where it is place on the Fault Bus  during Port02EN- as Transmitter Data (TDATA).  At bubble 905-11 W/GPRESS- is used to disable the transmitter.  It also leaves the RMS interface card at bubble 912-1 and goes to the Fault Display Panel A1A1 (see figure 11-7 sheet 1) at bubble 912 to light the lamp for Waveguide pressure.
 

LIMITS AND FAULTS


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The Waveguide Pressurization unit pressurizes the Spectrum Filter to 25 psi nominal for the purpose of ensuring that moist atmospheric air which could cause arcing is excluded by a positive pressure from the interior of the Spectrum Filter.  The alarm is set when the pressure drop below 20 psi, and will be display on the Man Machine Interface (MMI) as Spectrum Filter low pressure.
 
 

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