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field current supplied from B lead instead of from main bu

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nuckolls.bob(at)aeroelect
Guest

Posted: Sun Oct 04, 2020 8:47 am Post subject: field current supplied from B lead instead of from main bu

At 11:11 PM 10/3/2020, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "johnbright" <john_s_bright(at)yahoo.com>



 Hi Bob,



 Someone in my sphere suggested getting field current from the B lead instead of from the main bus.



 This way if the B lead shorts to ground and the fuselink opens, the field will be de-energized.



 Marked up snip of Z101B attached.



 Comments? 	


   If there is a fault that opens the fusible

   link, then the alternator is isolated from

   the ship's systems. While the field would

   still be energized, the resulting  condition

   is internal to the alternator and not a

   threat to the rest of the airplane.



   If the regulator senses bus voltage through

   the breaker, then you will depress bus voltage

   by whatever drop occurs in the b-lead. Further,

   the b-terminal to field breaker lead becomes and extension

   of the bus and would need to get a fusible

   link at the b-lead.



   Presently, I see no particular advantage

   for doing this.



 

   Bob . . .

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johnbright

Joined: 14 Dec 2011
Posts: 165
Location: Newport News, VA

Posted: Sun Oct 04, 2020 10:45 am Post subject: Re: field current supplied from B lead instead of from mai

 	  nuckolls.bob(at)aeroelect wrote: 	
		  At 11:11 PM 10/3/2020, you wrote:



   If there is a fault that opens the fusible

   link, then the alternator is isolated from

   the ship's systems. While the field would

   still be energized, the resulting  condition

   is internal to the alternator and not a

   threat to the rest of the airplane.



   If the regulator senses bus voltage through

   the breaker, then you will depress bus voltage

   by whatever drop occurs in the b-lead. Further,

   the b-terminal to field breaker lead becomes and extension

   of the bus and would need to get a fusible

   link at the b-lead.



   Presently, I see no particular advantage

   for doing this.



 

   Bob . . . 	




Thanks 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

_________________
John Bright, RV-6A, at FWF, O-360
Z-101 single batt dual alt SDS EM-5-F.
john_s_bright@yahoo.com, Newport News, Va
N1921R links

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