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Amp sensing with hall effect

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Jekyll

Joined: 22 Feb 2006
Posts: 44

Posted: Mon Jun 04, 2007 10:33 pm Post subject: Amp sensing with hall effect

I started witring up my hall sensor tonight but thought I should get a peer review on my electrical monitoring concept before I go further. My particulars are:

RV-7A

Z-13/8 with fuse blocks

GRT EIS-4000

GRT Horizon 1 EFIS (single)

P-Mag, E-Mag



I wired up a single hall effect sensor with 3 wires going through it: M-bus feed from a FW mounted ANL; B-bus feed from the hot side of the battery contactor; SD-8 feed from the SD-8 relay to the B-bus. My architecture is based on the ability to read total bus amperage on 1 sensor in both primary and alternate operating modes. Operating in either mode will show the total amps: in primary mode the M-bus and B-bus will be totaled (of course the M-bus will include the E-bus through the diode); in alternate mode, the SD-8 feed will be added to the sensor on its way to the B-bus, thense to the E-bus. Battery charging can be determined by subtracting total bus amps from the alternator output to determine amps available to charge the battery. As I have both the SD-8 and a P-mag, I'm less concerned about knowing the exact in/out amperage condition of the battery than I am with knowing my actual bus amps when operating on the SD-8. I don't desire to add a second sensor or a switching capability. 



The GRT system will show bus voltage with ample low voltage warning in all operating modes.



Just asking for comments to see if I missed anything before I commit the acts of cutting, stripping, crimping, soldering and drilling. 



Thanks,



Jekyll

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nuckollsr(at)cox.net
Guest

Posted: Tue Jun 05, 2007 5:27 am Post subject: Amp sensing with hall effect

At 11:33 PM 6/4/2007 -0700, you wrote:



 	  Quote: 	
		  



I started witring up my hall sensor tonight but thought I should get a 

peer review on my electrical monitoring concept before I go further. My 

particulars are:

RV-7A

Z-13/8 with fuse blocks

GRT EIS-4000

GRT Horizon 1 EFIS (single)

P-Mag, E-Mag



I wired up a single hall effect sensor with 3 wires going through it: 

M-bus feed from a FW mounted ANL; B-bus feed from the hot side of the 

battery contactor; SD-8 feed from the SD-8 relay to the B-bus. My 

architecture is based on the ability to read total bus amperage on 1 

sensor in both primary and alternate operating modes. Operating in either 

mode will show the total amps: in primary mode the M-bus and B-bus will be 

totaled (of course the M-bus will include the E-bus through the diode); in 

alternate mode, the SD-8 feed will be added to the sensor on its way to 

the B-bus, thense to the E-bus. Battery charging can be determined by 

subtracting total bus amps from the alternator output to determine amps 

available to charge the battery. As I have both the SD-8 and a P-mag, I'm 

less concerned about knowing the exact in/out amperage condition of the 

battery than I am with knowing my actual bus amps when operating on the 

SD-8. I don't desire to add a second sensor or a switching!

   capability.



The GRT system will show bus voltage with ample low voltage warning in all 

operating modes.



Just asking for comments to see if I missed anything before I commit the 

acts of cutting, stripping, crimping, soldering and drilling.



Thanks,



Jekyll


	


   Sounds like you're anticipating the need for

   knowing what currents are being draw for a variety

   of flight configurations and making a determination

   on-the-fly as to whether the alternator possesses

   sufficient capability to accommodate the battery.



   The BEST way to accomplish this is to do it in

   advance. There are no flight configurations for

   which power requirements can be deduced in advance.

   This process is called a load analysis. The archives

   are rich in conversation on this topic. Starting

   on page 4 of:



http://www.aeroelectric.com/FAQ/AeroElectric-List/AeroElectric-List_FAQ.pdf



   You'll find some filtered discussions on the

   topic. You can do a paper analysis with the aid of a

   form like



http://www.aeroelectric.com/articles/LoadAnalysis.pdf



   There's a repository on the website for sample

   load analysis conducted by members of this list in

   Excel. See:



http://www.aeroelectric.com/PPS/Load_Analysis/



   You can take one of these offerings as a starting

   point for doing your own load analysis.



   While the installation you propose is technically

   correct, it also suggests that you're adding

   instrumentation features to deduce what you should

   already know, and have A, B, C and D plans for.

   Making such real-time, in-flight measurements

   gives you more work to do as a systems manager

   and steals time and attention better expended

   as a pilot.



   Bob . . .



 	  Quote: 	
		  Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=116592#116592





--

6:43 PM

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Checked by AVG.


	




        Bob . . .



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

        ( "Physics is like sex: sure, it may   )

        ( give some practical results, but     )

        ( that's not why we do it."            )

        (                                      )

        (                 Richard P. Feynman   )

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

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Jekyll

Joined: 22 Feb 2006
Posts: 44

Posted: Tue Jun 05, 2007 9:12 am Post subject: Re: Amp sensing with hall effect

Thanks for the rapid reply. I've done a complete load analysis and update it whenever I make any changes.



Jekyll

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rvreynolds(at)macs.net
Guest

Posted: Sat Jun 16, 2007 4:03 am Post subject: Amp sensing with hall effect

I ran the M-Bus, E-Bus and feed from the Battery contactor thru the  

hall sensor. I want to read amps being used. I don't care about amps  

to the battery being charged. If the bus voltage is above 13,5, the  

battery is charging.



Be sure to run the wires thru the hall sensor in the same "sense", ie  

+ to -, or else you will subtract one of the amp values.



Richard Reynolds

On Jun 5, 2007, at 2:33 AM, Jekyll wrote:



 	  Quote: 	
		   



 I started witring up my hall sensor tonight but thought I should  

 get a peer review on my electrical monitoring concept before I go  

 further. My particulars are:

 RV-7A

 Z-13/8 with fuse blocks

 GRT EIS-4000

 GRT Horizon 1 EFIS (single)

 P-Mag, E-Mag



 I wired up a single hall effect sensor with 3 wires going through  

 it: M-bus feed from a FW mounted ANL; B-bus feed from the hot side  

 of the battery contactor; SD-8 feed from the SD-8 relay to the B- 

 bus. My architecture is based on the ability to read total bus  

 amperage on 1 sensor in both primary and alternate operating modes.  

 Operating in either mode will show the total amps: in primary mode  

 the M-bus and B-bus will be totaled (of course the M-bus will  

 include the E-bus through the diode); in alternate mode, the SD-8  

 feed will be added to the sensor on its way to the B-bus, thense to  

 the E-bus. Battery charging can be determined by subtracting total  

 bus amps from the alternator output to determine amps available to  

 charge the battery. As I have both the SD-8 and a P-mag, I'm less  

 concerned about knowing the exact in/out amperage condition of the  

 battery than I am with knowing my actual bus amps when operating on  

 the SD-8. I don't desire to add a second sensor or a switching!

   capability.



 The GRT system will show bus voltage with ample low voltage warning  

 in all operating modes.



 Just asking for comments to see if I missed anything before I  

 commit the acts of cutting, stripping, crimping, soldering and  

 drilling.



 Thanks,



 Jekyll





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=116592#116592

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Jekyll

Joined: 22 Feb 2006
Posts: 44

Posted: Sat Jun 16, 2007 1:18 pm Post subject: Re: Amp sensing with hall effect

Thanks Richard. I did the same. Yes, I have all the trons shepparded in the same direction. 



Jekyll

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