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Failure Detection and Annunciation question

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Allen Fulmer

Joined: 10 Jan 2006
Posts: 79
Location: Alexander City, AL

Posted: Sun Nov 08, 2009 6:43 pm Post subject: Failure Detection and Annunciation question

Bob,  

   

Was reviewing your article: http://www.aeroelectric.com/articles/Failure_Detection_and_Annunciation.pdf  

   

I want to annunciate the failure of a 12v scavenge pump to draw current.  You mention such a circuit being used on a heated pitot but I was wondering if it mattered if the load was a pump motor?  Full load would be approximately 5 amps and it needs to be running whenever the engine is running.  I figured the LED would come on whenever I put power to the ECU and Ignition and would quickly go out if the scavenge pump was pulling power as it should.  Thus, even if I “forgot” to flip the switch for the scavenge pump, the LED would illuminate until I did AND the pump was pulling power.  

   

Any problem with a motor as opposed to a resistance load?  Any other things I should consider?  

   

Thanks.  

   

Allen Fulmer  

RV7 Eggenfellner Turbo normalized 6 cyl.  

Finishing up the wiring  

       [quote][b]

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_________________
RV7 QB Fuselage
Eggenfellner H6 on orde
N808AF reserved
Alexander City, AL

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