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Non-switchable devices

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recapen(at)earthlink.net
Guest

Posted: Mon Feb 23, 2015 9:25 am Post subject: Non-switchable devices

I have a number of devices without a built-in 'off' switch that I would like to segregate and control with a single switch or relay.



They are currently activated when the master is turned on...fuel gauges, altitude encoder, trim indicators, and other similar items.

They are already separated to their own mini fuse block.



Here's my question:



Power the mini fuse block with a switch or with a switch controlling a relay...or don't bother?



Works pretty well as is - just thinking that I should have full-power-available to crank the engine till it starts.



Anyone out there fixed this and how?  Or is it a non-problem - looking for complexity?



Ralph Capen

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Bob McC

Joined: 09 Jan 2006
Posts: 258
Location: Toronto, ON

Posted: Mon Feb 23, 2015 9:53 am Post subject: Non-switchable devices

The minuscule amount of power drawn by the items you mentioned are a complete non-issue. Don't add a single point of failure.



Bob McC



 	  Quote: 	
		   Date: Mon, 23 Feb 2015 12:24:21 -0500

 From: recapen(at)earthlink.net

 To: aeroelectric-list(at)matronics.com

 Subject: AeroElectric-List: Non-switchable devices

 

 --> AeroElectric-List message posted by: "Ralph E. Capen" <recapen(at)earthlink.net>

 

 

 I have a number of devices without a built-in 'off' switch that I would like to segregate and control with a single switch or relay.

 

 They are currently activated when the master is turned on...fuel gauges, altitude encoder, trim indicators, and other similar items.

 They are already separated to their own mini fuse block.

 

 Here's my question:

 

 Power the mini fuse block with a switch or with a switch controlling a relay...or don't bother?

 

 Works pretty well as is - just thinking that I should have full-power-available to crank the engine till it starts.

 

 Anyone out there fixed this and how?  Or is it a non-problem - looking for complexity?

 

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

&gt=
	


 	  Quote: 	
		   

 

 


	


 		 	   		  

  [quote][b]

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_________________
Bob McC
Falco #908
(just starting)

jmjones2000(at)mindspring
Guest

Posted: Mon Feb 23, 2015 10:11 am Post subject: Non-switchable devices

Ralph,



I'm sure you will get some feedback asking why you want to turn those devices off so I will skip that part. 



Beechcraft uses a relay (for avionics master) that when powered, holds the contacts open.  It's a little backwards thinking but when the avionics master switch is in the "off" position, the relay is powered and opens the circuit. When the avionics master switch is in the "on" position, the relay is not powered and closes the contacts allowing electrons to flow. It is a spst or spdt nc relay like this one pc795-1c-c-12c-rn-x ( http://www.waytekwire.com/manf/141/PICKER-COMPONENTS/ )

It's a fail safe design. 



Hope this helps



Justin. 

 



 	  Quote: 	
		   On Feb 23, 2015, at 08:24, Ralph E. Capen <recapen(at)earthlink.net> wrote:

 

 

 

 

 I have a number of devices without a built-in 'off' switch that I would like to segregate and control with a single switch or relay.

 

 They are currently activated when the master is turned on...fuel gauges, altitude encoder, trim indicators, and other similar items.

 They are already separated to their own mini fuse block.

 

 Here's my question:

 

 Power the mini fuse block with a switch or with a switch controlling a relay...or don't bother?

 

 Works pretty well as is - just thinking that I should have full-power-available to crank the engine till it starts.

 

 Anyone out there fixed this and how?  Or is it a non-problem - looking for complexity?

 

 Ralph Capen

- 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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jmjones2000(at)mindspring
Guest

Posted: Mon Feb 23, 2015 11:29 am Post subject: Non-switchable devices

I should clarify the statement. The relay that Beechcraft uses is not physically like the one listed. The Beechcraft relay is much larger and heavier. Electrically it is similar in function. 

Justin

 	  Quote: 	
		   On Feb 23, 2015, at 09:10, Justin Jones <jmjones2000(at)mindspring.com> wrote:

 Ralph,

 I'm sure you will get some feedback asking why you want to turn those devices off so I will skip that part. 

 Beechcraft uses a relay (for avionics master) that when powered, holds the contacts open.  It's a little backwards thinking but when the avionics master switch is in the "off" position, the relay is powered and opens the circuit. When the avionics master switch is in the "on" position, the relay is not powered and closes the contacts allowing electrons to flow. It is a spst or spdt nc relay like this one pc795-1c-c-12c-rn-x ( http://www.waytekwire.com/manf/141/PICKER-COMPONENTS/ )

 It's a fail safe design. 

 Hope this helps

 Justin. 

> On Feb 23, 2015, at 08:24, Ralph E. Capen <recapen(at)earthlink.net> wrote:

> 

> 

> 

> 

> I have a number of devices without a built-in 'off' switch that I would like to segregate and control with a single switch or relay.

> 

> They are currently activated when the master is turned on...fuel gauges, altitude encoder, trim indicators, and other similar items.

> They are already separated to their own mini fuse block.

> 

> Here's my question:

> 

> Power the mini fuse block with a switch or with a switch controlling a relay...or don't bother?

> 

> Works pretty well as is - just thinking that I should have full-power-available to crank the engine till it starts.

> 

> Anyone out there fixed this and how?  Or is it a non-problem - looking for complexity?

> 

> Ralph Capen

- 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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