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Gilles.Thesee(at)ac-greno
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 Posted: Sun Nov 18, 2007 5:43 am Post subject: Re : Re: Rectifier-Regulator |
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| Quote: | In cruise (at)5200 RPM the voltmeter indicates about 13.5 to 14.0.
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Those numbers are exactly within specs.
| Quote: |
If I load the system down, lights, radio,and strobes the amp meter
will go from 20 amps to about 10 amps.
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Looks normal.
But it seems like a lot of loads : one must not get carried away with lights, strobes, bells and whistles. 12 amps is about the maximum current draw one must ask from the Rotax alternator/regulator to achieve adequate life expectancy.
| Quote: |
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?
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Oh yes. A correctly charged recombinant gas battery must read about 12.8 V after sitting for some hours.
| Quote: |
But my question was how do you test the regulator??????
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The easiest way is to monitor the voltage during normal operation.
Otherwise you need a special bench, like we set up to conduct our Rotax & Schicke regulator investigations :
http://contrails.free.fr/elec_ducati_en.php
But what makes you think there is something wrong with your regulator ?
Best regards,
Gilles
http://contrails.free.fr
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Gilles.Thesee(at)ac-greno
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| Posted: Sun Nov 18, 2007 6:44 am Post subject: Re : Re: Rectifier-Regulator |
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----- Message d'origine -----
De: jackandval <jackry(at)alltel.net>
| Quote: |
But my question was how do you test the regulator??????
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Jack,
Saw your post on the Zenith List Forum. Let's quickly review the physics of the Rotax alternator system.
The alternator provides electricity when the magnets rotate in front of the stator coils. Supplied AC voltage is dependant on RPM and can climb as high as 80-100 V.
The regulator is there to :
- Rectify the current to make itDC current
- Regulate the voltage so that is stay in the 13.5-14.5 range when RPM is sufficient.
IF the system overcharges - which yours doesn't, but let's pretend- the regulator will supply voltage ABOVE the rated voltage, let's say 15, 16....40 volts.
In this case, the REGULATOR is faulty, and obviously the alternator is working.
IF the alternator were faulty, it just COULDN'T supply electricity. In this case your system would be UNDERcharging.
A quick AC voltage measurement between the yellow alternator leads will tell the story.
Hope this helps,
Best regards,
Gilles
http://contrails.free.fr
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Sun Nov 18, 2007 8:52 am Post subject: Re : Re: Rectifier-Regulator |
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In Canada a certified airplane is allowed 100% of the load to a charging
system if a load meter is installed. Without the load meter only 80% of
capacity (in amps) is allowed.
Our planes are not certified and as such are not governed by the regulations
but the practice may be a good idea.
Output of the Rotax internal generator is 18A. 80% of that is 14.4A. That
is the greatest load I expect you would want to put on your buss and still
have a margin of safety.
Noel
| Quote: |
Looks normal.
But it seems like a lot of loads : one must not get carried
away with lights, strobes, bells and whistles. 12 amps is
about the maximum current draw one must ask from the Rotax
alternator/regulator to achieve adequate life expectancy.
|
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_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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