Regulator/Rectifier
in 912 / 914 Technical Questions
9 years ago
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by Robert J. Dean » 9 years ago
No
I had never heard of it, but now I know and I really appreciate the time you took to help with my question.
Bob
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by Jacques Foucher » 9 years ago
Indeed, I live near the Atlantic Ocean, and corrosion is a problem
Thank you Roger for your advice
Jacques
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by Paul Sanders » 9 years ago
I've just started to look at the electrical system install for the Rotax 912 ULS I am attempting to put in the Zenith CH750 I'm attempting to build and wondered if anyone could explain to me the purpose of the individual C, R and B wires. It looks like the three get combined (with the capacitor) and go as one wire to the.... ? I can't work out if it goes to the battery or the 'alternator input' on my power panel.
I'm totally new to all of this plane building thing but I firgure I'll only learn by asking questions so any advice/help appreciated. It would be great to get a first engine start over the new year, but I want to make sure i get it right.
Paul
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by Mike Miller » 9 years ago
Do not tie the three pins together and come out with one wire.
The R and +B pins are the regulator output and are internally jumped, so these two wires can be tied together. This typically feeds your bus through a fuse, about 30A.
The C pin is control and sense. Power to the C pin turns ON the regulator, when the C pin senses greater than 14 volts, it turns OFF the output to R and +B. If you jump the C pin to the R and +B pin, the regulator will self excite and can only be turned off by stopping the engine because the R and +B will feed the C pin until the magnets stop spinning. Opening the master switch will only disconnect your battery and cause wide voltage swings on the bus.
I would use a two pole master switch, one pole to power the master relay, the second pole connects the C pin to your bus.
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by Paul Sanders » 9 years ago
Hmm thanks for the reply and explanation - that helps a lot with my understanding of how this works. Most all of the examples I see online use the three wire method but I can see that this would be better.
Cheers.
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