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Dual Shunts with Dynon EMS

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jvolkober

Joined: 29 Aug 2010
Posts: 12

Posted: Thu Sep 02, 2010 8:15 pm Post subject: Dual Shunts with Dynon EMS

I have an SD-8 auxiliary alternator.  I am using the Z-13 wiring scheme which has shunts for the primary and auxiliary alternator.  I will be using a Dynon EMS.  The Dynon has a single input for ammeter.  I want to access the both shunts in the Z-13 wiring scheme.  My initial design was to use a DPDT relay connected to the auxiliary alternator switch.  With the switch in the off position, the primary alternator shunt would be connected to the EMS.  With the switch in the on position the relay would disconnect the primary and connect the auxiliary alternator shunt.  

   

[img]cid:image001.gif(at)01CB4AE2.6EEE5AD0[/img]  

   

Question: Is a simpler alternative to hook both shunts to the single EMS input?  And if I did this, would the reading be the sum of the two, if both alternators were active at the same time?

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user9253

Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan

Posted: Fri Sep 03, 2010 3:08 am Post subject: Re: Dual Shunts with Dynon EMS

Do not connect the two shunts in parallel.  Doing that is the same as connecting the two alternators in parallel.  The Dynon would read the higher of the two voltages, not the sum.  Using a relay will work.

Joe

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Joe Gores

email(at)jaredyates.com
Guest

Posted: Fri Sep 03, 2010 4:41 am Post subject: Dual Shunts with Dynon EMS

I was planning to use a separate dpdt switch on the instrument panel, but I like the relay idea.  Which relay were you planning to use?



On Fri, Sep 3, 2010 at 7:08 AM, user9253 <fran4sew(at)banyanol.com (fran4sew(at)banyanol.com)> wrote:

 [quote]--> AeroElectric-List message posted by: "user9253" <fran4sew(at)banyanol.com (fran4sew(at)banyanol.com)>

  

 Do not connect the two shunts in parallel.  Doing that is the same as connecting the two alternators in parallel.  The Dynon would read the higher of the two voltages, not the sum.  Using a relay will work.

 Joe

 

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nuckolls.bob(at)aeroelect
Guest

Posted: Fri Sep 03, 2010 7:08 am Post subject: Dual Shunts with Dynon EMS

At 06:08 AM 9/3/2010, you wrote:

 	  Quote: 	
		  



Do not connect the two shunts in parallel.  Doing that is the same 

as connecting the two alternators in parallel.  The Dynon would read 

the higher of the two voltages, not the sum.  Using a relay will work.

Joe


	


    Right on. I'll also suggest that unless the

    relay is really desirable from the perspective

    of reducing numbers of wires at the panel controls

    you might consider using just a DPDT switch

    as shown on the third page of:



http://www.aeroelectric.com/Catalog/AEC/9007/AEC9007-700.pdf

   Bob . . .

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jvolkober

Joined: 29 Aug 2010
Posts: 12

Posted: Fri Sep 03, 2010 8:20 am Post subject: Dual Shunts with Dynon EMS

I thought about the using the switch directly and may still do that.  Using

the relay tied to the switch for the auxiliary alternator set it up so the

shunt selection would occur when the auxiliary alternator was turned on,

eliminating the need to toggle two switches. 



John



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Bob McC

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

Posted: Fri Sep 03, 2010 9:09 am Post subject: Dual Shunts with Dynon EMS

So use a 3PDT switch for turning on the aux alternator. One pole switches the alternator on/off the other two switch the shunts. ????????

  

 Bob McC

 

[quote] From: jvolkober(at)comcast.net

 To: aeroelectric-list(at)matronics.com

 Subject: RE: Re: Dual Shunts with Dynon EMS

 Date: Fri, 3 Sep 2010 09:15:21 -0700

 

 --> AeroElectric-List message posted by: "John Volkober" <jvolkober(at)comcast.net>

 

 I thought about the using the switch directly and may still do that. Using

 the relay tied to the switch for the auxiliary alternator set it up so the

 shunt selection would occur when the auxiliary alternator was turned on,

 eliminating the need to toggle two switches. 

 

 John

 

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_________________
Bob McC
Falco #908
(just starting)

jvolkober

Joined: 29 Aug 2010
Posts: 12

Posted: Fri Sep 03, 2010 1:13 pm Post subject: Dual Shunts with Dynon EMS

Like this:  

   

[img]cid:image001.gif(at)01CB4B70.F0CABD30[/img]  

   

I tend to have a habit of taking the long way around the bush.  

   

John  

   

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Bob McC

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

Posted: Fri Sep 03, 2010 4:32 pm Post subject: Dual Shunts with Dynon EMS

John;  

   

The drawing is a little small to see the detail clearly but……….  

Yes, I think you’ve got it. (you’ve depicted a four pole switch, one pole of which you aren’t using which is fine.)   

You need a second wire to your load meter from the upper pole of the switch to complete the shunt circuit.  

The progressive transfer feature which I think you’ve depicted on the upper two poles isn’t needed.  

The switch need be only two position double throw, without a centre off position which it appears you’ve drawn.  

But yes, this is basically correct without nitpicking the drawing details which are waaay superior to anything I could come up with.JJJ  

   

Bob McC  

   

           

  

From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of John Volkober

 Sent: Friday, September 03, 2010 5:12 PM

 To: aeroelectric-list(at)matronics.com

 Subject: RE: AeroElectric-List: Re: Dual Shunts with Dynon EMS  

  

   

Like this:  

   

[img]cid:image002.gif(at)01CB4BA6.888FA240[/img]  

   

I tend to have a habit of taking the long way around the bush.  

   

John  

   

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Bob McC
Falco #908
(just starting)

jvolkober

Joined: 29 Aug 2010
Posts: 12

Posted: Sat Sep 04, 2010 6:55 am Post subject: Dual Shunts with Dynon EMS

Thank you for the feedback.  I did leave off the one wire for the load meter.   I’ll take a look at the “book” and make sure I order the correct switch for the job.  

   

John  

   

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