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ground power deep discharge of battery

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nuckolls.bob(at)aeroelect
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Posted: Thu Feb 10, 2022 10:10 am Post subject: ground power deep discharge of battery

 	  Quote: 	
		  If the polarity is backwards, the diode that is across the contactor coil will conduct a large current and blow the fuse that you are going to install.

 Hopefully that will happen quick enough to prevent damage to expensive avionics. 	


   Nothing 'hopeful' about it. The diode, being FORWARD

   biased, will not have a voltage drop not exceeding

   1 volt or so while the fuse is in the process of

   melting it's brains out . . . a couple milliseconds.



   The voltage impressed on the contactor coil during

   this interval is too short and too low for the

   contactor to even think about closing.



 

   Bob . . .



   Un impeachable logic: George Carlin asked, "If black boxes

   survive crashes, why don't they make the whole airplane

   out of that stuff?"

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