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JOHN TIPTON

Joined: 17 Sep 2006
Posts: 239
Location: Torquay - England

Posted: Tue Nov 07, 2017 6:22 am Post subject: Fuse link

Hi - My A/p control unit is placed on the left panel, the wire call-out is 22AWG with 5amp fuse or C/b, I'm going to put a C/b on the right panel, to serve as isolation or quick disconnect from co-pilot side, with the total run about 4 feet, C/b at mid point, do I up the wire to 18AWG, and put a 22AWG fuse link at the un-fused bus - regards: John

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nuckolls.bob(at)aeroelect
Guest

Posted: Tue Nov 07, 2017 9:58 am Post subject: Fuse link

At 08:22 AM 11/7/2017, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "JOHN TIPTON" <jmtipton(at)btopenworld.com>



 Hi - My A/p control unit is placed on the left panel, the wire call-out is 22AWG with 5amp fuse or C/b, I'm going to put a C/b on the right panel, to serve as isolation or quick disconnect from co-pilot side, with the total run about 4 feet, C/b at mid point, do I up the wire to 18AWG, and put a 22AWG fuse link at the un-fused bus - regards: John 	


   The a/p control head doesn't have a power switch on it?

   Don't understand the need for pressing breakers into

   service as failure mitigation devices. What kind of a/p

   are we talking about?



 

 

   Bob . . .

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JOHN TIPTON

Joined: 17 Sep 2006
Posts: 239
Location: Torquay - England

Posted: Tue Nov 07, 2017 4:27 pm Post subject: Fuse link

As mentioned, the C/b was going to be there to isolate the A/p on the copilot side, the pilots stick has a servo disconnect button - the A/p is a Trio ez-pilot

John



Sent from my iPad



     ----x--O--x----

On 7 Nov 2017, at 3:18 pm, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:

 	  Quote: 	
		    At 08:22 AM 11/7/2017, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "JOHN TIPTON" <jmtipton(at)btopenworld.com (jmtipton(at)btopenworld.com)>



 Hi - My A/p control unit is placed on the left panel, the wire call-out is 22AWG with 5amp fuse or C/b, I'm going to put a C/b on the right panel, to serve as isolation or quick disconnect from co-pilot side, with the total run about 4 feet, C/b at mid point, do I up the wire to 18AWG, and put a 22AWG fuse link at the un-fused bus - regards: John 	


   The a/p control head doesn't have a power switch on it?

   Don't understand the need for pressing breakers into

   service as failure mitigation devices. What kind of a/p

   are we talking about?



 

 

   Bob . . .

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nuckolls.bob(at)aeroelect
Guest

Posted: Tue Nov 07, 2017 6:15 pm Post subject: Fuse link

At 06:24 PM 11/7/2017, you wrote:

  	  Quote: 	
		  As mentioned, the C/b was going to be there to isolate the A/p on the copilot side, the pilots stick has a servo disconnect button - the A/p is a Trio ez-pilot

  	  Quote: 	
		  	
	
 

   Not sure what 'isolate' means . . . is it your desire

   to place an a/p disconnect feature in reach of the

   copilot? 



 

 

   Bob . . .

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JOHN TIPTON

Joined: 17 Sep 2006
Posts: 239
Location: Torquay - England

Posted: Wed Nov 08, 2017 12:51 am Post subject: Fuse link

Hi Bob

Yes: the C/b

John



Sent from my iPad



     ----x--O--x----

On 8 Nov 2017, at 2:14 am, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:

 	  Quote: 	
		    At 06:24 PM 11/7/2017, you wrote:

  	  Quote: 	
		  As mentioned, the C/b was going to be there to isolate the A/p on the copilot side, the pilots stick has a servo disconnect button - the A/p is a Trio ez-pilot

  	  Quote: 	
		  	
	
 

   Not sure what 'isolate' means . . . is it your desire

   to place an a/p disconnect feature in reach of the

   copilot? 



 

 

   Bob . . .

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zwakie

Joined: 03 Aug 2009
Posts: 157

Posted: Wed Nov 08, 2017 7:03 am Post subject: Re: Fuse link

Hi John, I don't understand why you would want to use a c/b (in the power feed line?!?) of the Trio where it has a pin dedicated that disconnects the A/P when connected to ground.



I don't have the pin number readily available, but all you would need is a normally open momentary switch that you can wire in parallel to the switch you already have. Wire-size is not critical because of the NO characteristic of the switch...

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_________________
Marcel Zwakenberg
Europa XS TG || 912ULS || PH-SBR

nuckolls.bob(at)aeroelect
Guest

Posted: Wed Nov 08, 2017 7:30 am Post subject: Fuse link

At 02:49 AM 11/8/2017, you wrote:

  	  Quote: 	
		  Hi Bob



 Yes: the C/b



 John 	


   I sense that you are perhaps putting too

   much weight on an a/p failure. First, the

   the most likely failure is simple shut down

   (quits and relaxes) or, if it uses stepper

   motors, freezes up. The least likely failure

   is a hard-over runaway.



   Should a runaway occur, the first thing

   you do is grab the stick and regain control.

   The a/p is physically incapable of forces 

   you cannot manage manually. Once control is

   achieved, getting it shut down is no big deal.

   I would resist adding any more hardware or holes

   in the panel just to effect a/p shutdown when

   the event being managed is not an emergency.



 

 

   Bob . . .

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JOHN TIPTON

Joined: 17 Sep 2006
Posts: 239
Location: Torquay - England

Posted: Wed Nov 08, 2017 10:25 am Post subject: Fuse link

Hi Marcel



Yes: I've got the servo disconnect available ready for the pilots stick grip, my thought is to put a breaker over on the right, so the copilot can have a 'disconnect' (that side will only have a PTT).



John



Sent from my iPad



     ----x--O--x----



 	  Quote: 	
		   On 8 Nov 2017, at 3:04 pm, zwakie <mz(at)cariama.nl> wrote:

 

 

 

 Hi John, I don't understand why you would want to use a c/b (in the power feed line?!?) of the Trio where it has a pin dedicated that disconnects the A/P when connected to ground.

 

 I don't have the pin number readily available, but all you would need is a normally open momentary switch that you can wire in parallel to the switch you already have.

 

 --------

 Marcel Zwakenberg

 XS TG || 912ULS || PH-SBR

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=474621#474621

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JOHN TIPTON

Joined: 17 Sep 2006
Posts: 239
Location: Torquay - England

Posted: Wed Nov 08, 2017 10:35 am Post subject: Fuse link

Hi Bob

Yes, you have summed it all up, what has been in my mind.

22AWG wire, 5amp fuse on the fuse block - no C/b --- 

Thank you

John



Sent from my iPad



     ----x--O--x----

On 8 Nov 2017, at 3:30 pm, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:

 	  Quote: 	
		    At 02:49 AM 11/8/2017, you wrote:

  	  Quote: 	
		  Hi Bob



 Yes: the C/b



 John 	


   I sense that you are perhaps putting too

   much weight on an a/p failure. First, the

   the most likely failure is simple shut down

   (quits and relaxes) or, if it uses stepper

   motors, freezes up. The least likely failure

   is a hard-over runaway.



   Should a runaway occur, the first thing

   you do is grab the stick and regain control.

   The a/p is physically incapable of forces 

   you cannot manage manually. Once control is

   achieved, getting it shut down is no big deal.

   I would resist adding any more hardware or holes

   in the panel just to effect a/p shutdown when

   the event being managed is not an emergency.



 

 

   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:

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