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912 Voltage Regulator Values

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scrimm

Joined: 09 Jan 2006
Posts: 81
Location: Gilbert, SC SC99

Posted: Sat Apr 14, 2007 11:26 am Post subject: 912 Voltage Regulator Values

Got  912 regulator questions, after lots of trouble shooting of the electrics, I  think I have narrowed it down to regulator not functioning correctly.  But  first some questions...

  

 1.  What is the  a/c voltage input to the the regulator supposed to be?  I am showing  15.4

  

 2.  What is the  d/c output voltage supposed to be?  I am showing voltage of 12.85 (battery  voltage I believe)?  My thinking is that it should be 14.5 or some where in  that neighborhood.  

  

 Thanks,

  

 Steve

  

   [quote][b]

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_________________
Steve Crimm
N42AH

nwcmc(at)tiscali.co.uk
Guest

Posted: Sat Apr 14, 2007 2:28 pm Post subject: 912 Voltage Regulator Values

<![if !supportLists]>Ø       <![endif]>What is the a/c voltage input to the the regulator supposed to be?  I am showing 15.4<  

   

The voltage will depend very much on how much load the regulator puts on the generator output. It is likely that the generator will provide all or nothing as it is just a collection of coils. The fact that you are reading a voltage at the input of the regulator infers that the problem is downstream of the generator.  

    

   

    

 	  Quote: 	
		  What is the d/c output voltage supposed to be?  I am showing voltage of 12.85 (battery voltage I believe)?  My thinking is that it should be 14.5 or some where in that neighborhood.<  

   
	


Once you have a voltage over 13 volts it is pretty certain that the battery is receiving charge. An ammeter as well as a voltmeter helps to show what is happening. Mine shows about 13.8 volts when on charge.  From the sound of it your regulator is probably at fault.  

   

There are two ways to improve regulator reliability:  

     Mount it in an area where it is kept relatively cool and free of      vibration. On top of the footwell is the usual choice. Added ram air      directed at the regulator is a good idea particularly with Classic      Europas. The under cowl temperatures with the Classic tend to be higher as      the exhaust air from the radiators routes through the engine bay. I use      the NACA duct on the lower starboard side of the cowl to provide ram air      for cooling for the fuel pipes using 2 inch flexible pipe. The pipe outlet      points at the regulator ensuring it receives a cool air supply.  
Limit your standing load to no more than 11 amps. The Europa is a      VFR aircraft so even with a fairly comprehensive panel I find this quite      easy to achieve. It becomes more of a problem if you include landing or      navigation lights.   

   

   

Nigel Charles  

   

   

  

         [quote][b]

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Gilles.Thesee(at)ac-greno
Guest

Posted: Mon Apr 16, 2007 12:23 am Post subject: 912 Voltage Regulator Values

Steve Crimm a écrit :

 	  Quote: 	
		   Got 912 regulator questions, after lots of trouble shooting of the 

 electrics, I think I have narrowed it down to regulator not 

 functioning correctly.  But first some questions...

  

 1.  What is the a/c voltage input to the the regulator supposed to 

 be?  I am showing 15.4


	


At max rev, the PM alternator can generate as high as 80-100 V. The 

voltage is far from being a sine wave.



 	  Quote: 	
		    

 2.  What is the d/c output voltage supposed to be?  I am showing 

 voltage of 12.85 (battery voltage I believe)?  My thinking is that it 

 should be 14.5 or some where in that neighborhood. 


	


The Rotax regulator puts out around 13.8 V when not too heavily loaded. 

12.85 V is the voltage of a fully charged battery.

Did you check the connection of the regulator case to ground, with a 

wire capable of at least 15-20 amps ?

Some info at

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



Regards,

Gilles

http://contrails.free.fr

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