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Wherefore loadmeters?

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shoskins(at)MCHSI.COM
Guest

Posted: Thu Nov 15, 2007 3:41 pm Post subject: Wherefore loadmeters?

Does anyone know where Bob's articles on load meters are?  I thought it might be in Chapter 7, but I couldn't find it.



Sam

  [quote][b]

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nuckolls.bob(at)cox.net
Guest

Posted: Fri Nov 16, 2007 6:15 am Post subject: Wherefore loadmeters?

At 05:39 PM 11/15/2007 -0600, you wrote:



 	  Quote: 	
		  Does anyone know where Bob's articles on load meters are?  I thought it 

might be in Chapter 7, but I couldn't find it.



Sam


	


   There are no articles specific to the topic

   of loadmeters. In general, these are generic

   ammeters but instead of calibrating the scale

   plate in amperes, they are calibrated in percent

   with 100% being full scale. See:



http://www.aeroelectric.com/Pictures/Instruments/Loadmeter_2.jpg



http://www.aeroelectric.com/Pictures/Instruments/loadmeter.jpg



https://matronics.com/aeroelectric/Catalog/9007-120-1_Loadmeter.jpg



   The handy thing about this calibrating convention

   is that a single instrument can be used with

   any size alternator or generator. The full

   scale sensitivity of instrument in amperes is

   set by the size of the companion shunt. See:



http://www.aeroelectric.com/Pictures/Instruments/20-50_Shunt.jpg



   A 20A shunt goes with alternators like the SD-20

   and the instrument reads full scale when 100%

   of the 20A machine is being taxed. It follows that

   other sized alternators are monitored with the

   appropriately sized shunt on the same instrument.



   When the system is fitted with more than one

   alternator, a single instrument can be switched

   between the two sources, each fitted with the

   appropriate sized shunt; wired as described here:



https://matronics.com/aeroelectric/Catalog/AEC/9007/AEC9007-700.pdf



   Bob . . .

        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

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shoskins(at)MCHSI.COM
Guest

Posted: Fri Nov 16, 2007 6:54 pm Post subject: Wherefore loadmeters?

Thanks for clearing that up for me.



Sam



On Nov 16, 2007 7:53 AM, Robert L. Nuckolls, III <nuckolls.bob(at)cox.net (nuckolls.bob(at)cox.net)> wrote:

 	  Quote: 	
		   --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckolls.bob(at)cox.net (nuckolls.bob(at)cox.net)>



At 05:39 PM 11/15/2007 -0600, you wrote:

 

 	  Quote: 	
		  Does anyone know where Bob's articles on load meters are?  I thought it

might be in Chapter 7, but I couldn't find it.



Sam


	




   There are no articles specific to the topic

    of loadmeters. In general, these are generic

   ammeters but instead of calibrating the scale

   plate in amperes, they are calibrated in percent

   with 100% being full scale. See:



 http://www.aeroelectric.com/Pictures/Instruments/Loadmeter_2.jpg



http://www.aeroelectric.com/Pictures/Instruments/loadmeter.jpg 



https://matronics.com/aeroelectric/Catalog/9007-120-1_Loadmeter.jpg



   The handy thing about this calibrating convention 

   is that a single instrument can be used with

   any size alternator or generator. The full

   scale sensitivity of instrument in amperes is

   set by the size of the companion shunt. See:



 http://www.aeroelectric.com/Pictures/Instruments/20-50_Shunt.jpg



   A 20A shunt goes with alternators like the SD-20

   and the instrument reads full scale when 100%

   of the 20A machine is being taxed. It follows that 

   other sized alternators are monitored with the

   appropriately sized shunt on the same instrument.



   When the system is fitted with more than one

   alternator, a single instrument can be switched

    between the two sources, each fitted with the

   appropriate sized shunt; wired as described here:



https://matronics.com/aeroelectric/Catalog/AEC/9007/AEC9007-700.pdf 



   Bob . . .

        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       ) 



	


-- 

Sam Hoskins

www.MistakeProofing.Net

www.MistakeProofing.net/blog/ 

618-967-0016 ph.

312-212-4086  fax  [quote][b]

- 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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shoskins(at)MCHSI.COM
Guest

Posted: Sat Nov 17, 2007 4:25 am Post subject: Wherefore loadmeters?

Another question about load meters.



Most ammeters display +/- amps; charge/discharge.



Why do load meters not display +/- percent?



Should a panel contain both a load meter and an ammeter, or can we get away with strictly a load meter? 



Thanks.



Sam

On Nov 16, 2007 7:53 AM, Robert L. Nuckolls, III <nuckolls.bob(at)cox.net (nuckolls.bob(at)cox.net)> wrote:

 	  Quote: 	
		   --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckolls.bob(at)cox.net (nuckolls.bob(at)cox.net)>



At 05:39 PM 11/15/2007 -0600, you wrote:

 

 	  Quote: 	
		  Does anyone know where Bob's articles on load meters are?  I thought it

might be in Chapter 7, but I couldn't find it.



Sam


	




   There are no articles specific to the topic

    of loadmeters. In general, these are generic

   ammeters but instead of calibrating the scale

   plate in amperes, they are calibrated in percent

   with 100% being full scale. See:



 http://www.aeroelectric.com/Pictures/Instruments/Loadmeter_2.jpg



http://www.aeroelectric.com/Pictures/Instruments/loadmeter.jpg 



https://matronics.com/aeroelectric/Catalog/9007-120-1_Loadmeter.jpg



   The handy thing about this calibrating convention 

   is that a single instrument can be used with

   any size alternator or generator. The full

   scale sensitivity of instrument in amperes is

   set by the size of the companion shunt. See:



 http://www.aeroelectric.com/Pictures/Instruments/20-50_Shunt.jpg



   A 20A shunt goes with alternators like the SD-20

   and the instrument reads full scale when 100%

   of the 20A machine is being taxed. It follows that 

   other sized alternators are monitored with the

   appropriately sized shunt on the same instrument.



   When the system is fitted with more than one

   alternator, a single instrument can be switched

    between the two sources, each fitted with the

   appropriate sized shunt; wired as described here:



https://matronics.com/aeroelectric/Catalog/AEC/9007/AEC9007-700.pdf 



   Bob . . .

        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       ) 



	


-- 

Sam Hoskins

www.MistakeProofing.Net

www.MistakeProofing.net/blog/ 

618-967-0016 ph.

312-212-4086  fax  [quote][b]

- 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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Bob McC

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

Posted: Sat Nov 17, 2007 6:22 am Post subject: Wherefore loadmeters?

 

 [quote]   ---

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_________________
Bob McC
Falco #908
(just starting)

kesleyelectric(at)chooseb
Guest

Posted: Sat Nov 17, 2007 7:15 am Post subject: Wherefore loadmeters?

Sam,

  

 The conventional battery ammeter measures current going  into the battery under charging conditions (+ reading), or flowing out of  the battery (- reading) when the alternator is not supporting the  load.  When the alternator is supporting the load and the battery is fully  charged, the ammeter will show very little deflection.

  

 The load meter measures only alternator output,regardless  of whether that output is supporting the load or charging the  battery.

  

 Tom Barter

 Kesley, IA

 Avid Magnum



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

Sent: Saturday, November 17, 2007 6:22 AM

To:  aeroelectric-list(at)matronics.com

Subject: Re: AeroElectric-List:  Wherefore loadmeters?

 

Another question about load meters.



Most ammeters display +/-  amps; charge/discharge.



Why do load meters not display +/-  percent?



Should a panel contain both a load meter and an ammeter, or can  we get away with strictly a load meter? 



Thanks.



Sam

 On Nov 16, 2007 7:53 AM, Robert L. Nuckolls, III <nuckolls.bob(at)cox.net (nuckolls.bob(at)cox.net)> wrote:

  	  Quote: 	
		  -->    AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckolls.bob(at)cox.net (nuckolls.bob(at)cox.net)>

   

At 05:39 PM 11/15/2007 -0600, you wrote:



 	  Quote: 	
		  Does    anyone know where Bob's articles on load meters are?  I thought    it

might be in Chapter 7, but I couldn't find    it.



Sam


	




  There are no articles specific to    the topic

  of loadmeters. In general, these are generic

     ammeters but instead of calibrating the scale

  plate in amperes, they    are calibrated in percent

  with 100% being full scale. See:



http://www.aeroelectric.com/Pictures/Instruments/Loadmeter_2.jpg



http://www.aeroelectric.com/Pictures/Instruments/loadmeter.jpg    



https://matronics.com/aeroelectric/Catalog/9007-120-1_Loadmeter.jpg



     The handy thing about this calibrating convention 

  is that a single    instrument can be used with

  any size alternator or generator. The    full

  scale sensitivity of instrument in amperes is

  set by    the size of the companion shunt. See:



http://www.aeroelectric.com/Pictures/Instruments/20-50_Shunt.jpg



     A 20A shunt goes with alternators like the SD-20

  and the instrument    reads full scale when 100%

  of the 20A machine is being taxed. It    follows that 

  other sized alternators are monitored with    the

  appropriately sized shunt on the same instrument.



     When the system is fitted with more than one

  alternator, a single    instrument can be switched

  between the two sources, each fitted with    the

  appropriate sized shunt; wired as described here:



https://matronics.com/aeroelectric/Catalog/AEC/9007/AEC9007-700.pdf    



  Bob . . .

          ----------------------------------------)

          ( . . .  a long habit of not thinking   )

          ( a thing wrong, gives it a superficial )

          ( appearance of being right . . .       )  



	


 

  	  Quote: 	
		  	
 

-- 

Sam Hoskins

www.MistakeProofing.Net

www.MistakeProofing.net/blog/  

618-967-0016 ph.

312-212-4086  fax [quote]



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href="http://forums.matronics.com">http://forums.matronics.com



[b]

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Eric M. Jones

Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts

Posted: Sun Nov 18, 2007 8:12 am Post subject: Re: Wherefore loadmeters?

Whyfor Loadmeters? Am I missing something?



I suggest that unless you can find a really great reason for having a loadmeter. Don't bother. 



My airplane will not have one. One the other hand what my airplane does have (sleeping in a large box full of stuff....) is a Xantrex XBM battery monitor. This puppy monitors the health of the battery and tells me how long the battery will power the airplane at the current load and lots more. MUCH better information. 



See: http://www.xantrex.com/support/web/id/1006/support1.asp

and  http://www.xantrex.com/web/id/96/p/1/pt/7/product.asp



"What the West really has to offer is honesty. Somehow, in the midst of their horrid history, the best among the Gaijin learned a wonderful lesson. They learned to distrust themselves, to doubt even what they were taught to believe or what their egos make them yearn to see. To know that even truth must be scrutinized, it was a great discovery...."

 

      -- David Brin, "Dr. Pak's Preschool

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_________________
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net

jan.de.jong(at)xs4all.nl
Guest

Posted: Mon Nov 19, 2007 3:33 am Post subject: Wherefore loadmeters?

 	  Quote: 	
		   My airplane will not have one. One the other hand what my airplane does have (sleeping

 in a large box full of stuff....) is a Xantrex XBM battery monitor. This

 puppy monitors the health of the battery and tells me how long the battery

 will power the airplane at the current load and lots more. MUCH better information.

 See: http://www.xantrex.com/support/web/id/1006/support1.asp

 and  http://www.xantrex.com/web/id/96/p/1/pt/7/product.asp

   

The manufacturer:
	


http://www.tbs-electronics.nl/products_expert501_downloads.htm#table



Cheers,

Jan de Jong

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