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GNS430W and TruTrak AP

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bbradburry(at)verizon.net
Guest

Posted: Fri Jun 26, 2015 10:58 am Post subject: GNS430W and TruTrak AP

What happens to the voltage on the essential buss if it is loaded too

heavily and the diode does not have a heat sink installed?  



I am having my radio and my autopilot reset from time to time in flight and

I suspect that the voltage on the essential buss is dropping to a level that

causes this.  I plan to check the voltage on the buss next time I am at the

airport to try and confirm the voltage idea.



What can cause the voltage to drop if that is the problem?  High resistance

connections?  What else should I check?



Bill

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user9253

Joined: 28 Mar 2008
Posts: 1921
Location: Riley TWP Michigan

Posted: Fri Jun 26, 2015 11:34 am Post subject: Re: GNS430W and TruTrak AP

If the diode is too hot to touch, it should have a heat sink.

It is unlikely that normal current through a diode will drop the voltage enough to cause avionics to reboot.  More likely is a loose connection.

Does the problem occur while the ebus switch is on?

Joe

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_________________
Joe Gores

nuckolls.bob(at)aeroelect
Guest

Posted: Fri Jun 26, 2015 12:05 pm Post subject: GNS430W and TruTrak AP

At 01:56 PM 6/26/2015, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "Bill Bradburry" <bbradburry(at)verizon.net>



 What happens to the voltage on the essential buss if it is loaded too

 heavily and the diode does not have a heat sink installed?  



 I am having my radio and my autopilot reset from time to time in flight and

 I suspect that the voltage on the essential buss is dropping to a level that

 causes this.  I plan to check the voltage on the buss next time I am at the

 airport to try and confirm the voltage idea.



 What can cause the voltage to drop if that is the problem?  High resistance

 connections?  What else should I check? 	


   Diodes don't do that. Your data acquisition and

   diagnosis problem is not unlike that described

   in another thread on this forum theorizing about

   root cause of an OV trip.



   Transient events are . . . just that . . .SHORT.

   Probability of capturing data with the ordinary

   shop tools that will flashlight a path to discovery

   is slim.



   Does your diode get too hot to touch? What is it

   mounted to and what kind of diode? Try flying with

   the alternate feed switch ON thus bypassing the

   normal feed through the diode.



   In the mean time, I'll continue a recently resurrected

   notion of devising some data capture tools that can

   be easily acquired or perhaps mailed around. Playing

   'swap-tronics' until the problem goes away is not

   very professional or satisfying.



 

   Bob . . .    [quote][b]

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