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EXP2BUS and non-functioning alternator

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ixb(at)videotron.ca
Guest

Posted: Thu Apr 30, 2009 6:43 am Post subject: EXP2BUS and non-functioning alternator

Hello,

I'm in the primary flight testing phase with my RV-9A.  I have an

EXP2BUS and a 40A alternator with an internal regulator which came from

AeroSport Power in Vancouver.



I've never seen the alternator charging strongly, although my test pilot

thinks he saw 20A the other day.  I see no amps at any engine speed.



I believe I have everything connected correctly and wondered if anyone

on the list had a similar experience.



Any advice on what to check and in what sequence, would be appreciated.



This is my first Matronics post, and hopefully my new-to-Canadian-skies

RV-9A will be able to feed itself with electric power with your help.



Thanks,

Ian Brown,

Bromont,

Quebec

PS:  The belt IS tight, but not too tight!

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mprather(at)spro.net
Guest

Posted: Thu Apr 30, 2009 7:36 am Post subject: EXP2BUS and non-functioning alternator

What's the bus voltage?  If you see values above 12.5V your alternator is

putting out some power.  If it's above 14V, it sounds like completely

normal output.



I'm not very familiar with the EXP2BUS..  Where in the circuit is current

being measured.  Does the system use a shunt or a hall effect sensor?

Regards,



Matt-



 	  Quote: 	
		   



 Hello,

 I'm in the primary flight testing phase with my RV-9A.  I have an

 EXP2BUS and a 40A alternator with an internal regulator which came from

 AeroSport Power in Vancouver.



 I've never seen the alternator charging strongly, although my test pilot

 thinks he saw 20A the other day.  I see no amps at any engine speed.



 I believe I have everything connected correctly and wondered if anyone

 on the list had a similar experience.



 Any advice on what to check and in what sequence, would be appreciated.



 This is my first Matronics post, and hopefully my new-to-Canadian-skies

 RV-9A will be able to feed itself with electric power with your help.



 Thanks,

 Ian Brown,

 Bromont,

 Quebec

 PS:  The belt IS tight, but not too tight!

- The Matronics AeroElectric-List Email Forum -

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nuckolls.bob(at)aeroelect
Guest

Posted: Thu Apr 30, 2009 7:43 am Post subject: EXP2BUS and non-functioning alternator

At 09:37 AM 4/30/2009, you wrote:

 	  Quote: 	
		  



Hello,

I'm in the primary flight testing phase with my RV-9A.  I have an

EXP2BUS and a 40A alternator with an internal regulator which came from

AeroSport Power in Vancouver.



I've never seen the alternator charging strongly, although my test pilot

thinks he saw 20A the other day.  I see no amps at any engine speed.



I believe I have everything connected correctly and wondered if anyone

on the list had a similar experience.



Any advice on what to check and in what sequence, would be appreciated.



This is my first Matronics post, and hopefully my new-to-Canadian-skies

RV-9A will be able to feed itself with electric power with your help.


	


   What's your bus voltage? Where does your instrumentation

   read Amps? Battery? Alternator output?

        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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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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ixb(at)videotron.ca
Guest

Posted: Thu Apr 30, 2009 8:43 am Post subject: EXP2BUS and non-functioning alternator

Actually I am supposed to have amps being measured on the alternator

output with a shunt, for the Van's Aircraft ammeter, and with an

induction coil for the Rocky Mountain EIS.  Both agree that I'm not

putting out amps, and the system is not charging at all.  If I run on my

Dynon EFIS I get quite a good measure of battery voltage, and it goes

down steadily whether the engine is running or not.  



I guess I may be a bit premature in addressing this list since there is

an anomaly I have to check first.  The alternator warning light does not

come on at all. Any suggestions on why this might be would be

appreciated.  It could be a simple mis-wire since I just started running

the engine recently, and had the battery on a trickle charger constantly

until about a week ago.  Hopefully the two are symptoms of the same

problem.



Ian



On Thu, 2009-04-30 at 10:43 -0500, Robert L. Nuckolls, III wrote:

 	  Quote: 	
		   

 

 At 09:37 AM 4/30/2009, you wrote:

 >

 >

 >Hello,

 >I'm in the primary flight testing phase with my RV-9A.  I have an

 >EXP2BUS and a 40A alternator with an internal regulator which came from

 >AeroSport Power in Vancouver.

 >

 >I've never seen the alternator charging strongly, although my test pilot

 >thinks he saw 20A the other day.  I see no amps at any engine speed.

 >

 >I believe I have everything connected correctly and wondered if anyone

 >on the list had a similar experience.

 >

 >Any advice on what to check and in what sequence, would be appreciated.

 >

 >This is my first Matronics post, and hopefully my new-to-Canadian-skies

 >RV-9A will be able to feed itself with electric power with your help.

 

    What's your bus voltage? Where does your instrumentation

    read Amps? Battery? Alternator output?

 

 

         Bob . . .

 

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

         ( . . .  a long habit of not thinking   )

         ( a thing wrong, gives it a superficial )

         ( appearance of being right . . .       )

         (                                       )

         (                  -Thomas Paine 1776-  )

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

- 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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mprather(at)spro.net
Guest

Posted: Thu Apr 30, 2009 9:12 am Post subject: EXP2BUS and non-functioning alternator

Do the people that produce the EXP2BUS provide a troubleshooting guide? 

That's what I'd start on (after verifying to the best of my ability that

the system is wired as designed).

Regards,



Matt-



 	  Quote: 	
		   



 Actually I am supposed to have amps being measured on the alternator

 output with a shunt, for the Van's Aircraft ammeter, and with an

 induction coil for the Rocky Mountain EIS.  Both agree that I'm not

 putting out amps, and the system is not charging at all.  If I run on my

 Dynon EFIS I get quite a good measure of battery voltage, and it goes

 down steadily whether the engine is running or not.



 I guess I may be a bit premature in addressing this list since there is

 an anomaly I have to check first.  The alternator warning light does not

 come on at all. Any suggestions on why this might be would be

 appreciated.  It could be a simple mis-wire since I just started running

 the engine recently, and had the battery on a trickle charger constantly

 until about a week ago.  Hopefully the two are symptoms of the same

 problem.



 Ian



 On Thu, 2009-04-30 at 10:43 -0500, Robert L. Nuckolls, III wrote:

> 

> <nuckolls.bob(at)aeroelectric.com>

>

> At 09:37 AM 4/30/2009, you wrote:

> >

> >

> >Hello,

> >I'm in the primary flight testing phase with my RV-9A.  I have an

> >EXP2BUS and a 40A alternator with an internal regulator which came from

> >AeroSport Power in Vancouver.

> >

> >I've never seen the alternator charging strongly, although my test

> pilot

> >thinks he saw 20A the other day.  I see no amps at any engine speed.

> >

> >I believe I have everything connected correctly and wondered if anyone

> >on the list had a similar experience.

> >

> >Any advice on what to check and in what sequence, would be appreciated.

> >

> >This is my first Matronics post, and hopefully my new-to-Canadian-skies

> >RV-9A will be able to feed itself with electric power with your help.

>

>    What's your bus voltage? Where does your instrumentation

>    read Amps? Battery? Alternator output?

>         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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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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nuckolls.bob(at)aeroelect
Guest

Posted: Thu Apr 30, 2009 10:46 am Post subject: EXP2BUS and non-functioning alternator

 	  Quote: 	
		  Actually I am supposed to have amps being measured on the alternator

output with a shunt, for the Van's Aircraft ammeter, and with an

induction coil for the Rocky Mountain EIS.  Both agree that I'm not

putting out amps, and the system is not charging at all.  If I run on my

Dynon EFIS I get quite a good measure of battery voltage, and it goes

down steadily whether the engine is running or not.


	


    Okay, next step is to see if the alternator is even being

    asked to go to work. Under conditions that you would expect

    the alternator to be working, check for command voltage

    at the alternator's control connector.



 	  Quote: 	
		  I guess I may be a bit premature in addressing this list since there is

an anomaly I have to check first.  The alternator warning light does not

come on at all.


	


    If the alternator is not being commanded ON, it may

    well consider operations to be "normal" and not

    illuminate a light.



        Bob . . .



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

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

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

- 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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ixb(at)videotron.ca
Guest

Posted: Fri May 01, 2009 5:42 am Post subject: EXP2BUS and non-functioning alternator

Not sure if I'm messing up the list by responding to multiple responses

- maybe someone could coach me on the etiquette.



I see 12V on the "IG" input on the alternator (the top of the "T"), and

about 1V on the lamp.



I have an external master relay, and the EXP2BUS relay has been removed

and replaced with a jumper.



So I think the alternator is being asked to work.



Ian



On Thu, 2009-04-30 at 13:44 -0500, Robert L. Nuckolls, III wrote:

 	  Quote: 	
		   

 

 

 >Actually I am supposed to have amps being measured on the alternator

 >output with a shunt, for the Van's Aircraft ammeter, and with an

 >induction coil for the Rocky Mountain EIS.  Both agree that I'm not

 >putting out amps, and the system is not charging at all.  If I run on my

 >Dynon EFIS I get quite a good measure of battery voltage, and it goes

 >down steadily whether the engine is running or not.

 

     Okay, next step is to see if the alternator is even being

     asked to go to work. Under conditions that you would expect

     the alternator to be working, check for command voltage

     at the alternator's control connector.

 

 >I guess I may be a bit premature in addressing this list since there is

 >an anomaly I have to check first.  The alternator warning light does not

 >come on at all.

 

     If the alternator is not being commanded ON, it may

     well consider operations to be "normal" and not

     illuminate a light.

 

 

 

         Bob . . .

 

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

         ( . . .  a long habit of not thinking   )

         ( a thing wrong, gives it a superficial )

         ( appearance of being right . . .       )

         (                                       )

         (                  -Thomas Paine 1776-  )

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

- 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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ianxbrown

Joined: 16 May 2009
Posts: 80

Posted: Sat May 16, 2009 2:08 pm Post subject: Re: EXP2BUS and non-functioning alternator

I discovered that the IG lead to the alternator was only producing 12V when measured disconnected.  As soon as a load was applied that went down to 1.5V.   It turns out that some filings had got under the legs of an IRF4905 Mosfet and seemed to have shorted the pins.  



So, new question:  Does anyone know how to test whether the cleaned up IRF4905 still works, and what the pinouts might be.  There are three legs, but nothing I've read tells me what leg does what.  Would I have to remove the IRF4905 from the board to test it's output?



Thanks for your help so far, which got me to this point.



Ian

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