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Rectifier-Regulator

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jackandval

Joined: 18 Jul 2007
Posts: 21
Location: blairsville, GA

Posted: Sat Nov 17, 2007 6:03 pm Post subject: Rectifier-Regulator

I have a Rotax 912 and it is overcharging. I can't find anything in the manuals of how to check if it is a bad regulator. If it is charging does that mean it is a bad regulator?



Thanks,

Jack

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Gilles.Thesee(at)ac-greno
Guest

Posted: Sat Nov 17, 2007 6:21 pm Post subject: Rectifier-Regulator

jackandval a écrit :

 	  Quote: 	
		   



 I have a Rotax 912 and it is overcharging. I can't find anything in the manuals of how to check if it is a bad regulator. If it is charging does that mean it is a bad regulator?

   


	


Jack,



We'll need some additional info.

What voltage do you read, where and when ?

What is the corresponding engine RPM ?

How does the number of devices connected to the ship's circuit affect 

the readings ?

What is the state of your battery ?

How does actual charge influence the voltage readings ?

Do you have the requested capacitor installed ?

Have you checked every connection and wire, especially regulator ground ?

Etc.



Also, a schematic of your wiring will help interpreting the symptoms. It 

often boils down to bad wiring.



Best regards,

-- 

Gilles

http://contrails.free.fr

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jackandval

Joined: 18 Jul 2007
Posts: 21
Location: blairsville, GA

Posted: Sun Nov 18, 2007 5:25 am Post subject: Re: Rectifier-Regulator

In cruise (at)5200 RPM the voltmeter indicates about 13.5 to 14.0.



If I load the system down, lights, radio,and strobes the amp meter will go from 20 amps to about 10 amps.



Yes the capacitor is correct. No loose connections and good ground.



Battery after flight was checked a few hours later and reads 11.8 or 9

which sort of makes the battery suspect?



But my question was  how do you test the regulator??????



Thanks,

Jack

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pwmac(at)sisna.com
Guest

Posted: Sun Nov 18, 2007 6:33 am Post subject: Rectifier-Regulator

You do NOT have a regulator issue. You do might have a bad battery 

since the voltage is so low.

IMO, cover up the  amp meter and pay attention to the voltmeter. If 

the voltage stays as you indicated all is well with the alternator 

and regulator.

After flight a good battery should read above ~12.7+ and as high as 

13.5+ Of course if you are exceeding the alternator capability then 

the battery would not be fully charged. and could account for low 

batt voltage. Do the following on your next flight: Operate with the 

lowest electrical load you can and then check the batt volts an hour 

after flight then again in 24 hours. If the batt stays above ~12.7, 

then the batt is ok and you are just overloading he wimpy Rotax 

alternator. You could also verify the batt is good with an overnight 

charge at the 2 amp rate then wait 24 hours for it to loose its 

surface charge then see what the voltage is.

Paul

================



At 05:25 AM 11/18/2007, you wrote:

 	  Quote: 	
		  



In cruise (at)5200 RPM the voltmeter indicates about 13.5 to 14.0.



If I load the system down, lights, radio,and strobes the amp meter 

will go from 20 amps to about 10 amps.



Yes the capacitor is correct. No loose connections and good ground.



Battery after flight was checked a few hours later and reads 11.8 or 9

which sort of makes the battery suspect?



But my question was  how do you test the regulator??????



Thanks,

Jack





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Float Flyr

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

Posted: Sun Nov 18, 2007 8:53 am Post subject: Rectifier-Regulator

The test for the regulator is to use a voltmeter...  You're past that stage.

The generator has to put out a voltage above that of the battery,

theoretically 12 V. to allow the battery enough EMF to charge.  Most

regulators are set to 13.8V., rounded off that's 14V which is what the

certified planes rate their busses.



Sounds to me like your regulator/rectifier is doing just fine.



Noel



[quote] --

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_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

jackandval

Joined: 18 Jul 2007
Posts: 21
Location: blairsville, GA

Posted: Sun Nov 18, 2007 2:54 pm Post subject: Re: Rectifier-Regulator

Thanks Guys! I think your right that it is the battery. I am charging the battery and will  see what it reads tomorrow.



Jack

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