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Master/Battery/Alt Field vs. Master/Battery and Alt Fiel

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nuckolls.bob(at)aeroelect
Guest

Posted: Fri Jul 05, 2013 9:54 am Post subject: Master/Battery/Alt Field vs. Master/Battery and Alt Fiel

At 11:34 AM 7/5/2013, you wrote:

 	  Quote: 	
		  



I'm using the LR3C-14 external regulator and fuse blocks from B&C. 

My field supply includes a fuse in my fuse block but I cannot pull 

the fuse during flight.


	


   then you have not followed instructions for the LR3C-14

   for supplying field power through a breaker. This is to

   accommodate the regulator's built in crowbar OV shutdown

   system.



 	  Quote: 	
		  It sounds like I should either move the field supply to a breaker on 

the panel that I can pull, or use the 3-position switch.


	


   You need the breaker anyhow. After that, a 2 or 3 position

   switch as you wish.



 	  Quote: 	
		  Another question. All of my 250 hours of flight are in a 1959 C172, 

which has a generator. There is a master switch with two positions. 

My question is under what conditions would one operate "battery only"?


	


   Ground maintenance operations. Getting the

   ATIS and Clearance delivery before starting

   the engine.  Shutting the generator/alternator

   off for some kind of mis-behavior - voltage jumping

   around but not so vigorously as to trip the OV

   system.

   Bob . . .

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mburbidg(at)gmail.com
Guest

Posted: Fri Jul 05, 2013 10:28 am Post subject: Master/Battery/Alt Field vs. Master/Battery and Alt Fiel

Bob,

Thanks. Glad I asked. I see the note about the breaker in bold. I had read the instructions at one point, and had ordered the 5 Amp breaker. So I have it. But I had not revisited the instructions when I started the wiring. It seems like a lot of non-TSO'ed equipment comes with almost no instructions and you get used to figuring it out on your own with help from forums and mailing lists. The B&C instructions are quite complete. A good reminder for me to use the instructions when they are supplied!

Thanks,

Michael-

On Jul 5, 2013, at 10:53 AM, "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com> wrote:

 	  Quote: 	

 At 11:34 AM 7/5/2013, you wrote:

> 

> 

> I'm using the LR3C-14 external regulator and fuse blocks from B&C. My field supply includes a fuse in my fuse block but I cannot pull the fuse during flight.

  then you have not followed instructions for the LR3C-14

  for supplying field power through a breaker. This is to

  accommodate the regulator's built in crowbar OV shutdown

  system.

> It sounds like I should either move the field supply to a breaker on the panel that I can pull, or use the 3-position switch.

  You need the breaker anyhow. After that, a 2 or 3 position

  switch as you wish.

> Another question. All of my 250 hours of flight are in a 1959 C172, which has a generator. There is a master switch with two positions. My question is under what conditions would one operate "battery only"?

  Ground maintenance operations. Getting the

  ATIS and Clearance delivery before starting

  the engine.  Shutting the generator/alternator

  off for some kind of mis-behavior - voltage jumping

  around but not so vigorously as to trip the OV

  system.

  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

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