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Low voltage problem resolved

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lgold(at)quantum-associat
Guest

Posted: Tue Jan 08, 2008 3:56 pm Post subject: Low voltage problem resolved

Bob,

I think I found the problem (but can't be sure until the weather clears and

I fly the plane). The fuselink between SW1-4 and the Alternator controller

was blown. It likely shorting out during construction because it isn't

shorting now.

After spending 9-hours trying to track-down the problem I have a concern

about fuselinks. Unlike a fuse, you can't see that a fuselink has blown. Had

I used a fuse rather than a fuselink I would have found the problem in

minutes. Since my fuse holder is right next to the fuselink and I won't

expose the circuit to extra lengths of non-fused wire, I plan to replace the

fuselink with a 1-AMP ATC (bayonet type) fuse on my main buss.

Regards,

Les    



[quote] --

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nuckolls.bob(at)cox.net
Guest

Posted: Wed Jan 09, 2008 12:50 am Post subject: Low voltage problem resolved

At 11:36 AM 1/8/2008 -0800, you wrote:



 	  Quote: 	
		  

<lgold(at)quantum-associates.com>



Bob,

I think I found the problem (but can't be sure until the weather clears and

I fly the plane). The fuselink between SW1-4 and the Alternator controller

was blown. It likely shorting out during construction because it isn't

shorting now.

After spending 9-hours trying to track-down the problem I have a concern

about fuselinks. Unlike a fuse, you can't see that a fuselink has blown. Had

I used a fuse rather than a fuselink I would have found the problem in

minutes. Since my fuse holder is right next to the fuselink and I won't

expose the circuit to extra lengths of non-fused wire, I plan to replace the

fuselink with a 1-AMP ATC (bayonet type) fuse on my main buss.

Regards,

Les


	


   I'm sorry that it took you so long to track this down but

   a fusible link was selected for this application because of

   its very long time constant. I you put a fuse in that slot,

   it will have to be much larger than the downstream breaker

   so that the crowbar system opens the breaker without opening

   the fuse.



   The usual approach to troubleshooting these kinds of

   issues is by judicious probing with a voltmeter. Only

   after the open circuit is isolated down to a manageable

   segment does the visual inspection mode of investigation

   kick in. I'll recommend you stay with the fusible link

   in this situation.



   Bob . . .

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