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Rotax 912 overvoltage

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Dick Maddux

Joined: 24 Jun 2008
Posts: 516
Location: Milton, Fl

Posted: Sun Jan 25, 2009 1:41 pm Post subject: Rotax 912 overvoltage

Here's a new one for me. I just installed a Monroy 300 traffic alerter in my panel. One of the features of this unit is an indication of voltage. It warns you if your voltage exceeds 14.8 volts. (aural warning as well as indicated voltage) I got that warning today. It indicated a max of 15 volts momentary and varied between about 13.8 and 14.5 depending on the engine speed. The warning on the Monroy was confirmed by my analog voltmeter. After searching through all the manuals I finally came up with a chart in the installation manual that talked about the normal voltage values of the silicone rectifier. I am running too high. It mentioned cleaning the connections,overheat,etc. Has anyone had this problem? Any ideas on how to proceed. I hate to buy a new voltage regulator as they are expensive. There is very little in the books on this and no way to adjust the voltage that I know of.

          Thanks!

                                                     Dick Maddux

                                                     Fox 4-1200

                                                     Pensacola,Fl

 From Wall Street to Main Street and everywhere in between, stay up-to-date with the [url=http://aol.com?ncid=emlcntaolcom00000023 ]latest news[/url].

  [quote][b]

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Paul A. Franz, P.E.

Joined: 02 Dec 2008
Posts: 280
Location: Bellevue WA

Posted: Sun Jan 25, 2009 3:31 pm Post subject: Rotax 912 overvoltage

On Sun, January 25, 2009 1:30 pm, Catz631(at)aol.com wrote:

 	  Quote: 	
		   Here's a new one for me. I just installed a Monroy 300 traffic alerter in my

 panel. One of the features of this unit is an indication of voltage. It warns

 you if your voltage exceeds 14.8 volts. (aural warning as well as indicated

 voltage) I got that warning today. It indicated a max of 15 volts momentary and

 varied between about 13.8 and 14.5 depending on the engine speed. The warning

 on the Monroy was confirmed by my analog voltmeter. After searching through

 all the manuals I finally came up with a chart in the installation manual that

 talked about the normal voltage values of the silicone rectifier. I am running

 too high. It mentioned cleaning the connections,overheat,etc. Has anyone had

 this problem? Any ideas on how to proceed. I hate to buy a new voltage

 regulator as they are expensive. There is very little in the books on this and no way

 to adjust the voltage that I know of.


	


Post this on the Aeroelectric List. Likely Bob Nucholls will respond with the precise

answer which could involve the alternator/generator too.



-- 

Paul A. Franz

Registration/Aircraft - N14UW/Merlin GT

Engine/Prop - Rotax 914/NSI CAP

Bellevue WA

425.241.1618 Cell

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_________________
Paul A. Franz, P.E.
Registration/Aircraft - N14UW/Merlin GT
Engine/Prop - Rotax 914/NSI CAP
Bellevue WA
425.241.1618 Cell
425.440.9505 Office

Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Mon Jan 26, 2009 11:12 am Post subject: Rotax 912 overvoltage

Two places to look.  

   

There is a voltage sensing lead on your regulator/rectifier it can be corroded at the point it connects to the battery or buss.  The reference ground for that voltage is usually the back of the rectifier case.  To check that you have to unbolt the case clean around the bolt hole and clean the back of the case before re installing..  if you find any corrosion there after you clean it up you may consider smearing a bit of grease on the back of the unit to slow down any more corrosion from forming.  

   

Noel  

       

From: owner-kitfox-list-server(at)matronics.com [mailto:owner-kitfox-list-server(at)matronics.com] On Behalf Of Catz631(at)aol.com

 Sent: Sunday, January 25, 2009 6:01 PM

 To: kitfox-list(at)matronics.com

 Subject: Rotax 912 overvoltage  

  

  

     

Here's a new one for me. I just installed a Monroy 300 traffic alerter in my panel. One of the features of this unit is an indication of voltage. It warns you if your voltage exceeds 14.8 volts. (aural warning as well as indicated voltage) I got that warning today. It indicated a max of 15 volts momentary and varied between about 13.8 and 14.5 depending on the engine speed. The warning on the Monroy was confirmed by my analog voltmeter. After searching through all the manuals I finally came up with a chart in the installation manual that talked about the normal voltage values of the silicone rectifier. I am running too high. It mentioned cleaning the connections,overheat,etc. Has anyone had this problem? Any ideas on how to proceed. I hate to buy a new voltage regulator as they are expensive. There is very little in the books on this and no way to adjust the voltage that I know of.  

    

         Thanks!  

    

                                                    Dick Maddux  

    

                                                    Fox 4-1200  

    

                                                    Pensacola,Fl  

  

       

  

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_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

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