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RotaxEngines-List:Electical System 912S

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Savannah174(at)msn.com
Guest

Posted: Thu Aug 30, 2007 6:32 pm Post subject: RotaxEngines-List:Electical System 912S

<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->  I've a 912S on a Savannah aircraft with a Microair 760 comm. Comm works  static free 5X5 with engine not running. With engine at idle I'd rate it as 2X5  as RPM is increased so does the radio static. The radio has a profesional made  harness by a reputable shop. Looking at the electrical diagram in the  Installation manual I notice  a capacitor with a value of 22000mfd 25volts  can anyone tell me if that's a required component or is it an option this part  is not installed on my electrical system, Can antone advise, thaks

  

 Regards,

 RJ Roy

 [quote]   ---

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hgmckay

Joined: 23 May 2006
Posts: 397

Posted: Fri Aug 31, 2007 5:18 am Post subject: RotaxEngines-List:Electical System 912S

Roger:  

<![if !supportEmptyParas]> <![endif]>  

Install the 22000mfd capacitor. This is to reduce the emf noise caused by the rotating engine that is putting out electrical energy to charge the battery. Your Comm will pick it up as rf energy.  

<![if !supportEmptyParas]> <![endif]>  

Hugh McKay  

Allegro 2000  

912 UL  

<![if !supportEmptyParas]> <![endif]>  

-----Original Message-----

 From: owner-rotaxengines-list-server(at)matronics.com [mailto:owner-rotaxengines-list-server(at)matronics.com]On Behalf Of Roger Roy

 Sent: Thursday, August 30, 2007 10:32 PM

 To: rotaxengines-list(at)matronics.com

 Subject: Re: RotaxEngines-List:Electical System 912S  

<![if !supportEmptyParas]> <![endif]>  

I've a 912S on a Savannah aircraft with a Microair 760 comm. Comm works static free 5X5 with engine not running. With engine at idle I'd rate it as 2X5 as RPM is increased so does the radio static. The radio has a profesional made harness by a reputable shop. Looking at the electrical diagram in the Installation manual I notice  a capacitor with a value of 22000mfd 25volts can anyone tell me if that's a required component or is it an option this part is not installed on my electrical system, Can antone advise, thaks  

   

Regards,  

RJ Roy    

----- Original Message -----   

From: Roger Lee (ssadiver1(at)yahoo.com)   

To: rotaxengines-list(at)matronics.com (rotaxengines-list(at)matronics.com)   

Sent: Thursday, August 30, 2007 10:04 PM  

Subject: Re: Hello out There?  

<![if !supportEmptyParas]> <![endif]>  

--> RotaxEngines-List message posted by: "Roger Lee" <ssadiver1(at)yahoo.com (ssadiver1(at)yahoo.com)>

 

 Hi Malcolm,

 

 

 Don't fly it until you have this figured out. 

 You may lose an engine in flight.

 It has to be your charging unit out put or the reg/rectifier. My bet it is your reg/rectifier. They go out more often than most charging system parts. It is easy to replace, too. First look carefully at the wires going into the reg/rectifier and see if they look burnt or very dark in color. You can take a volt meter and put this on the terminals to the battery and see what the voltage to the battery is, like you said it should be about 13.8V to 14.2V is normal. This may vary a little, but should be close.

 See the attachment

 

 --------

 Roger Lee

 Tucson, Az.

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=131952#131952

 

 

 

 

 Attachments: 

 

 http://forums.matronics.com//files/generator_and_low_voltage_159.pdfnbsp;        Features Subscriptions title=http://www.matronics.com/Navigator?RotaxEngines-List href="http://www.matronics.com/Navigator?RotaxEngines-List">http://www.p;    available via title=http://forums.matronics.com/ href="http://forums.matronics.com">http://forums.matronics.com

 ===========

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Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Fri Aug 31, 2007 11:48 am Post subject: Re: RotaxEngines-List:Electical System 912S

Hi Roy,



I agree with Hugh, put the capacitor in. MY Kolb had it as do many other planes and it should take care of the static. It will also help protect your electrical system.

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Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

rampil

Joined: 04 May 2007
Posts: 870

Posted: Wed Sep 05, 2007 5:24 am Post subject: Re: RotaxEngines-List:Electical System 912S

RJ,



The capacitor is mandatory.  The engine's charging coils put out AC

current which is "rectified" into positive going half sine-like pulses.

The cap is required to convert the AC into semi-smooth DC for all

your instruments, etc.  This is standard power supply design.

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