Matronics Email Lists :: View topic - Loss of essential bus

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

Loss of essential bus

Matronics Email Lists Forum Index -> AeroElectric-List

View previous topic :: View next topic

Author Message

ronschreck

Joined: 04 Aug 2006
Posts: 192
Location: Gold Hill Airpark, NC (NC25)

Posted: Thu Aug 16, 2007 1:16 pm Post subject: Loss of essential bus

I have an intermittent loss of the essential bus in  my RV-8.  I have wired it similar to Bob's Z-11 Generic Light Aircraft  Electrical System except that I have added an aux battery as depicted in his  Z-30  diagram, as I have dual electronic ignition.  I suspect that the  problem is in the diode that prevents reverse current when the essential bus  alternate feed switch is turned on.  My question: Is it possible that this  diode is defective and could cause intermittent loss of the essential bus?   When it occurs, the current is almost immediately restored without any action on  my part, but it does cause all the avionics to reboot.  It occurs without  warning and I cannot trust it in IFR conditions.  Any suggestions?   Thanks.

  

 Ron Schreck

 RV-8, "Miss Izzy"

 Gold Hill Airpark, NC

   [quote][b]

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

nuckollsr(at)cox.net
Guest

Posted: Sat Aug 18, 2007 7:14 am Post subject: Loss of essential bus

At 05:14 PM 8/16/2007 -0300, you wrote:



 	  Quote: 	
		  I have an intermittent loss of the essential bus in my RV-8.  I have wired 

it similar to Bob's Z-11 Generic Light Aircraft Electrical System except 

that I have added an aux battery as depicted in his Z-30  diagram, as I 

have dual electronic ignition.  I suspect that the problem is in the diode 

that prevents reverse current when the essential bus alternate feed switch 

is turned on.  My question: Is it possible that this diode is defective 

and could cause intermittent loss of the essential bus?


	


   I've never seen a diode go intermittently open . . .

   but that doesn't mean it absolutely cannot happen

   however it's hard to imagine how.



 	  Quote: 	
		     When it occurs, the current is almost immediately restored without any 

 action on my part, but it does cause all the avionics to reboot.  It 

 occurs without warning and I cannot trust it in IFR conditions.  Any 

 suggestions?  Thanks.


	


   I'd suspect a loose connection first. There's not

   many. Check them all. As long as your crawling around

   under there . . . you could consider replacing both

   wires (fresh crimps) and a new diode. In any case,

   the problem cannot be terribly difficult, it doesn't

   involved much hardware.



   Bob . . .

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

Display posts from previous:

	Matronics Email Lists Forum Index -> AeroElectric-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum