Today's Message Index:
----------------------
1. 05:41 AM - Re: Rotax 912 Charging Problem (rampil)
2. 06:07 AM - Re: Re: Rotax 912 Charging Problem (Bob Borger)
3. 06:11 AM - Re: Re: Rotax 912 Charging Problem (Pete Christensen)
4. 06:37 AM - Re: Rotax 912 Charging Problem (Catz631@aol.com)
Message 1
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| Subject: | Re: Rotax 912 Charging Problem |
Hi Hugh,
Yes, the latest install manual has a plot of output vs rpm which
implies 20 A at 5000. However, the same manual also has a limit
of 250 W on the alternator which at 13.5 is 18 A.
In my original install manual, the limit was 17 A at 5800 rpm, derated
to 16 A at 5500 rpm.
To my knowledge, there has been no power output upgrade to the
alternator since 2002 when my engine was delivered.
Your problem seems to be completely explained by excessive load on
the alternator and has nothing to do with the battery.
Therefore, I may be crazy, but I am going to stand with my explanation
given the limited info you supplied, and say that the new Install
Manual is "generous"
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=265520#265520
Message 2
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| Subject: | Re: Rotax 912 Charging Problem |
Hello Hugh,
I'll add my two cents to say that I agree completely with Ira. The stock alternator
on the Rotax 9xx series engine is hard pressed to turn out more than 15
amps at 13.8 volts. And if you do try to run more than that through the Ducatti
regulator the regulator will die.
I suggest you sort out your power requirements to keep them under 15 amps for most
of the flight so there some extra amps available to recharge the battery.
Then you can add the landing lights and other power hogs at the end of the flight
if they are needed. And find one of those Schumacher battery tenders that
'lectric Bob recommends and use it to keep your battery happy between flights.
Check six,
Bob Borger
Europa XS, Rotax 914, Airmaster C/S prop
On Tuesday, September 29, 2009, at 07:39AM, "rampil" <ira.rampil@gmail.com> wrote:
>
>Hi Hugh,
>
>Yes, the latest install manual has a plot of output vs rpm which
>implies 20 A at 5000. However, the same manual also has a limit
>of 250 W on the alternator which at 13.5 is 18 A.
>
>In my original install manual, the limit was 17 A at 5800 rpm, derated
>to 16 A at 5500 rpm.
>
>To my knowledge, there has been no power output upgrade to the
>alternator since 2002 when my engine was delivered.
>
>Your problem seems to be completely explained by excessive load on
>the alternator and has nothing to do with the battery.
>
>Therefore, I may be crazy, but I am going to stand with my explanation
>given the limited info you supplied, and say that the new Install
>Manual is "generous"
>
>--------
>Ira N224XS
>
>
>Read this topic online here:
>
>http://forums.matronics.com/viewtopic.php?p=265520#265520
>
>
Message 3
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| Subject: | Re: Rotax 912 Charging Problem |
Hugh,
I used the stock unit from Rotax. It is easy to install. I did add an
aluminum heat sink thinking it would help keep things cool. Mine failed
at about 400 hours. My regulator is behind my panel not in the engine
area.
Pete
----- Original Message -----
From: Hugh MCKAY III
To: rotaxengines-list@matronics.com
Sent: Monday, September 28, 2009 8:38 PM
Subject: Re: RotaxEngines-List: Re: Rotax 912 Charging Problem
Pete:
What brand/type regulator did you have that failed? What
type/brand did you replace it with?
Hugh McKay
--- On Mon, 9/28/09, Pete Christensen
<pchristensen10@austin.rr.com> wrote:
From: Pete Christensen <pchristensen10@austin.rr.com>
Subject: Re: RotaxEngines-List: Re: Rotax 912 Charging Problem
To: rotaxengines-list@matronics.com
Date: Monday, September 28, 2009, 2:54 PM
Had the same problem with my Kitfox III/912. Asked the same
questions. Replaced the rectifier/regulator. Problem solved.
Pete
----- Original Message -----
From: Hugh MCKAY III
To: rotaxengines-list@matronics.com
Sent: Monday, September 28, 2009 1:07 PM
Subject: RotaxEngines-List: Re: Rotax 912 Charging Problem
I have a Rotax 912 UL engine on an Allegro 2000 LSA.
Recently I have had to replace my battery (12V 18Ah) because of it's
inability to crank the engine. Prior to replacing the battery I noticed
my combination Volt/Amp meter showed only 12 volts while flying. Usually
the voltmeter shows about 13.5 volts at start-up while the engine is
running on the ground and while flying. After replacing the battery, and
starting the engine the voltmeter returned to 13.5 volts. However, when
I began to close certain circuit breakers engaging the front landing
light, the two wing tip landing lights, the two wing tip strobes, and
the nav. lights I noticed the volt meter dropping back each time I
engaged one of the breakers until finally the volt meter again was
indicating only about 12 volts just as before. I have a "no charge" red
light in the battery charging circuit that comes on if the battery is
not being charged while the engine is running. This light normally does
not come on unless the engine is at very low rpm ( aprx.1400 rpm). This
is not normal for my engine for my idle speed is set at 1800 rpm.
I do not know why the voltage is dropping each time
I close the breaker for lights described above, or what may be causing
the voltage drop. I know I have a good battery, but I don't know if my
regulator is going bad, or if there may be aground some where, or
somthing else. Can anyone shed any light on what may be causing this?
The engine has only 255 hours on it and I have not had any other
problems with the engine. Any help would be greatly appreciated.
Hugh G. McKay III
Allegro 2000
Rotax 912 UL
N661WW
hgmckay@bellsouth.net
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Message 4
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| Subject: | Re: Rotax 912 Charging Problem |
Hugh,
I had a similar problem with not enough voltage. I have a Monroy traffic
alerter in my aircraft (a GOOD thing !). It monitors your buss voltage when
it is not detecting other aircraft. The female voice alerted me to "low
voltage" and sure enough the gauge confirmed it.
I removed the regulator and cleaned each of the terminals in the hope that
it might be corrosion. That did the trick and I now have normal voltage.
You might give that a try before buying another regulator. They are expensive.
Dick Maddux
Fox 4
Pensacola,Fl
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