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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

PostPosted: Sun Nov 08, 2009 6:43 pm    Post subject: Failure Detection and Annunciation question Reply with quote

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
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