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E-bus feed switch rating

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ChrisJ

Joined: 10 Jun 2015
Posts: 1

Posted: Wed Jun 10, 2015 2:15 pm Post subject: E-bus feed switch rating

I'm using the Z-12 electrical schematic to wire my airplane, and I had a question about the E-bus feed switch rating. My E-bus will draw 22-30 amps depending on transient loads like flaps or boost pump. My diode will handle that just fine, but the toggles I bought from B&C are only rated to 15A. Do I need to hunt down an appropriately rated switch for this application?  I searched the archives and didn't really find the answer. I can't be the first guy to put a few too many things on the E-bus can I??

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user9253

Joined: 28 Mar 2008
Posts: 1913
Location: Riley TWP Michigan

Posted: Wed Jun 10, 2015 3:36 pm Post subject: Re: E-bus feed switch rating

Wire the eBus per Z-32

http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdfs/Z32K.pdf

Notice that the relay has a diode arc suppressor.  An external diode can be connected.  Or buy a relay with a built in diode.  If the relay has a built-in diode, then polarity matters.

http://www.digikey.com/product-detail/en/1432793-1/PB1773-ND/1236843

The advantages of using a relay are remote control (shut off power at the source instead of running a hot wire into the cockpit).  And a relay can be used to handle more current than a small switch can handle.

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_________________
Joe Gores

rossmickey(at)comcast.net
Guest

Posted: Wed Jun 10, 2015 7:53 pm Post subject: E-bus feed switch rating

What does the arc suppressor do? 



Ross Mickey

541-954-7521

 	  Quote: 	
		   On Jun 10, 2015, at 4:36 PM, user9253 <fransew(at)gmail.com> wrote:

 

 

 

 Wire the eBus per Z-32

 http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdfs/Z32K.pdf

 Notice that the relay has a diode arc suppressor.  An external diode can be connected.  Or buy a relay with a built in diode.  If the relay has a built-in diode, then polarity matters.

 http://www.digikey.com/product-detail/en/1432793-1/PB1773-ND/1236843

 The advantages of using a relay are remote control (shut off power at the source instead of running a hot wire into the cockpit).  And a relay can be used to handle more current than a small switch can handle.

 

 --------

 Joe Gores

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=443373#443373

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jmjones2000(at)mindspring
Guest

Posted: Thu Jun 11, 2015 2:34 am Post subject: E-bus feed switch rating

I used one of these. 



http://www.aircraftspruce.com/catalog/elpages/pbcircuitbrkr2.php?clickkey=11597



 



 	  Quote: 	
		   On Jun 10, 2015, at 14:15, ChrisJ <dangerplane(at)mac.com> wrote:

 

 

 

 I'm using the Z-12 electrical schematic to wire my airplane, and I had a question about the E-bus feed switch rating. My E-bus will draw 22-30 amps depending on transient loads like flaps or boost pump. My diode will handle that just fine, but the toggles I bought from B&C are only rated to 15A. Do I need to hunt down an appropriately rated switch for this application?  I searched the archives and didn't really find the answer. I can't be the first guy to put a few too many things on the E-bus can I??

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=443368#443368

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user9253

Joined: 28 Mar 2008
Posts: 1913
Location: Riley TWP Michigan

Posted: Thu Jun 11, 2015 3:53 am Post subject: Re: E-bus feed switch rating

 	  Quote: 	
		  What does the arc suppressor do? 

Ross Mickey 	


When current though an inductor (coil) is shut off, the collapsing magnetic field induces a high voltage that makes current flow in SAME direction as it was originally flowing.  This principle is used to power spark plugs in engines.  An analogy is to quickly shut off the flow of water in a pipe.  The water tends to keep flowing due to inertia.  Without some type of shock absorber, the pipes will hammer and bang.  This principle is used to pump water without external power (hydraulic ram pump).

  Anyway, when current to a relay is shut off, the high induced voltage will arc across the open switch contacts, shortening the life of the switch.  A diode connected across the coil will short out induced current and limit the voltage to about 1V.  The arrow on the diode should point towards positive.  The diode will not conduct while the relay is energized, but it will conduct induced current when the relay is de-energized.

Joe

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_________________
Joe Gores

nuckolls.bob(at)aeroelect
Guest

Posted: Thu Jun 11, 2015 5:09 am Post subject: E-bus feed switch rating

At 05:15 PM 6/10/2015, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "ChrisJ" <dangerplane(at)mac.com>



 I'm using the Z-12 electrical schematic to wire my airplane, and I had a question about the E-bus feed switch rating. My E-bus will draw 22-30 amps depending on transient loads like flaps or boost pump. My diode will handle that just fine, but the toggles I bought from B&C are only rated to 15A. Do I need to hunt down an appropriately rated switch for this application?  I searched the archives and didn't really find the answer. I can't be the first guy to put a few too many things on the E-bus can I?? 	




   That is NOT an E-BUS . . .



   E stands for 'endurance'. The e-bus is intended

   to offer a fast-configuration to Plan-B . . . battery

   only, alternator-out operations . . .or perhaps

   reduced capabilities supported by a standby alternator

   like Z-13/8.



   The e-bus alternate feed offers a means by which

   the airplane can be powered-down to the minimum

   equipment needed for comfortable continuation of

   flight . . . preferably to the airport of intended

   destination. It's an energy management tool that

   must calls for (1) developing the minimalist list

   of support equipment and (2) planning for the energy

   needed. If you're battery-only, then your well advised

   to install and maintain a battery of KNOWN capacity

   that will support your e-bus loads for the endurance

   design goals.  I like to plan to run out of fuel before

   I run out of watt-seconds.



   With no standby alternator, the typical ebus loads

   are 2-5 amps. With an SD-8 second alternator,

   e-bus can run 8+ amps . . . perhaps more and still

   SAVE the battery for descent and approach to landing.

   

   With an SD-20, you install Z-12 and don't even

   need an e-bus.



 

   Bob . . .    [quote][b]

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nuckolls.bob(at)aeroelect
Guest

Posted: Thu Jun 11, 2015 5:29 am Post subject: E-bus feed switch rating

At 05:33 AM 6/11/2015, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: Justin Jones <jmjones2000(at)mindspring.com>



 I used one of these. 



  http://www.aircraftspruce.com/catalog/elpages/pbcircuitbrkr2.php?clickkey=11597 

 	


    Why a breaker/switch?  Those are loaded with mechanical

    monkey motion to combine the functions. Rube Goldburg

    would be proud . . . if you don't NEED the circuit

    protection, then a plain vanilla switch is the better

    choice.



 [img]cid:7.1.0.9.0.20150611082213.0205e990(at)aeroelectric.com.0[/img] 



 

 

   Bob . . .

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