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Rotax 912ULS charging problem

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Gilles.Thesee(at)ac-greno
Guest

Posted: Mon Sep 12, 2011 11:35 am Post subject: Rotax 912ULS charging problem

N992DN a écrit :

 	  Quote: 	
		  

 On aero electric web site I found the internal diagram of the charger 

 rectifier associated with Rotax 912 engine, the diagram is located here:



  



  http://aeroelectric.com/Mfgr_Data/Regulators/Ducati_Rotax/Ducati_Regulator_Wiring_1.pdf 



  



 My question is if this diagram is correct (because I can see some 

 ?????? beside some of the components) or is it some kind of "reverse 

 engineering"?



  




	


Nati and all,



The diagram on the left was provided by a fellow builder. I redrew the 

diagram after some study of the rectifier regulator :

http://contrails.free.fr/elec_ducati_en.php

As you say it is indeed a case of reverse engineering.



Best regards,

-- 

Gilles

http://contrails.free.fr

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nuckolls.bob(at)aeroelect
Guest

Posted: Mon Sep 12, 2011 1:04 pm Post subject: Rotax 912ULS charging problem

At 11:37 AM 9/12/2011, you wrote:



  	  Quote: 	
		  On aero electric web site I found the internal diagram of the charger rectifier associated with Rotax 912 engine, the diagram is located here:

 

  

 

    http://aeroelectric.com/Mfgr_Data/Regulators/Ducati_Rotax/Ducati_Regulator_Wiring_1.pdf  

 

  

 

 My question is if this diagram is correct (because I can see some ?????? beside some of the components) or is it some kind of "reverse engineering"? 	


   It's a deduced diagram somebody sent us that was based

   on their dissection of the product by carving out the

   potting compound.

  	  Quote: 	
		   

 

 The problem  I am trying to solve however is intermittent  false indication of the charge warning light. The light will come on from time to time or just flicker while the charge is on, I can verify it on the voltmeter installed on the instrument panel. I am trying to locate the source of problem by looking for any loose connection between the trio of R, B and C of the rectifier terminals. 	


    I can't vouch for the diagrams accuracy . . . only that

    it is typical of such single-phase rectifier/regulators

    on small engines.



    Recommend you disconnect the light and use an active

    notification of low voltage that is independent

    of the charging system. That light is sorta like

    the alternator warning light on cars. Tells a limited

    story.



    Bob . . .    [quote][b]

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nuckolls.bob(at)aeroelect
Guest

Posted: Mon Sep 12, 2011 1:05 pm Post subject: Rotax 912ULS charging problem

 	  Quote: 	
		  

The diagram on the left was provided by a fellow builder. I redrew 

the diagram after some study of the rectifier regulator :

http://contrails.free.fr/elec_ducati_en.php

As you say it is indeed a case of reverse engineering.



Best regards,

--

Gilles


	


    Yeah, I'd forgotten who sent me that. How are you

    my friend. Long time no hear!



    Bob  . . .

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jan_de_jong(at)casema.nl
Guest

Posted: Tue Sep 13, 2011 7:11 am Post subject: Rotax 912ULS charging problem

Another schematic attached - also without correctness guarantee.



Jan de Jong

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n992dn(at)gmail.com
Guest

Posted: Tue Sep 13, 2011 10:22 am Post subject: Rotax 912ULS charging problem

Jan  

   

Thanks so much, I think the diagram you provided is  accurate, the replacement part number for the SCR (2N6504) help verifying that these are SCR'S. by looking at your diagram I was able to understand the principal of operation of the charger. The two SCRs are used to connect to ground each one of the G terminals during its negative part of the cycle making it referenced to ground so the other G terminal can charge the battery thru the in line diode. (the G leads coming from the engine are not referenced to ground otherwise).  

With regards to my charging problem, the way I read the diagram is the charge light on/off control is related only to the existing of AC energy between the two G terminals, not to anything else, it’s a bit surprising. My understanding of the charge light logic did not help me at all to Identify the source of the incorrect  indication problem I am facing with.  

   

Bob,   

   

I suggest that you replace the diagram  currently published on your web site with the one Jan has provided   

   

   

Thanks and regards  

Nati  

 On Tue, Sep 13, 2011 at 10:07 AM, Jan de Jong <jan_de_jong(at)casema.nl (jan_de_jong(at)casema.nl)> wrote:

 [quote]Another schematic attached - also without correctness guarantee.



Jan de Jong

 [b]

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nuckolls.bob(at)aeroelect
Guest

Posted: Tue Sep 13, 2011 6:20 pm Post subject: Rotax 912ULS charging problem

 	  Quote: 	
		  Bob,



I suggest that you replace the diagram  currently published on your 

web site with the one Jan has provided



Thanks and regards



Nati




	




    Good idea sir. I'll do it right now.



    Bob . . .

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