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nuckolls.bob(at)aeroelect
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 Posted: Fri Jan 22, 2021 5:16 pm Post subject: Zeftronics Regulator Connection Question |
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At 05:51 PM 1/22/2021, you wrote:
| Quote: | | --> AeroElectric-List message posted by: "farmrjohn" <faithvineyard(at)yahoo.com> |
I have a Zeftronics R15100 voltage regulator that has the following terminals: I-A-S-F.
Only three terminals have wires connected to them, I-A-F. For low or high voltage indication
it looks like an Electronics International VA-1 voltmeter is used. Everything seems
to be working (system shows 14.1 volts when engine running, alternator on), should
I move the I lead to the S terminal?
Man! You got me! That regulator is FAA-PMA replacement
for the stock 'ford' regulators common to single engine,
14v Cessnas for probably over a decade. That regulator
is featured in my Z-Figures and written about in the
'Connection'. Attached is a page excerpted from a Cessna
maintenance manual on single engine airplanes.
Clearly, the wiring depicted is consistent with
our understanding of how that regulator works.
Why your regulator appears to be working is a mystery.
It's sound logic to not mess with a working
system . . . but . . . I would sure like to
understand why it is working.
Having said that, we also know that while
certain after-market, plug-n-play 'ford'
regulators are not form-fit-and-function
in a Cessna. I tried to replace a failed
regulator in a C-172XP rental and was treated
with an overvoltage condition when I turned
the alternator on. I don't recall details of
the variation but clearly, risks for differences
were not zero.
This Zeftronics device includes extra features
(diagnostics) not part of the generic 'ford'
regulator.
https://tinyurl.com/y6le6gdo
There may be other nuances not
obvious to us . . . but I'm mystified as to
how/why your system appears to be functional.
Perhaps a call to Zeftronics?
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
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nuckolls.bob(at)aeroelect
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| Posted: Sat Jan 23, 2021 11:01 am Post subject: Zeftronics Regulator Connection Question |
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I've updated the drawing that was attached to my last
reply to this thread. Interested readers can download
at:
https://tinyurl.com/yxg6hfrj
There are additional nuances to the Cessna alternator
incorporation philosophy that I may add later on
a second page to this drawing . . . will give
a heads-up when posted.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
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racerjerry
Joined: 15 Dec 2009
Posts: 202
Location: Deer Park, NY
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| Posted: Sat Jan 23, 2021 11:19 am Post subject: Re: Zeftronics Regulator Connection Question |
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Bob, Zeftronics offers an excellent troubleshooting guide for their voltage regulators online. The included diagrams MAY help to clear up some of the mystery; unfortunately, it's still a bit opaque for me. And yes, my guess is "If it ain't broke - Don't fix it" still applies.
https://www.zeftronics.com/wp-content/uploads/2014/06/Z13PS.pdf
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Jerry King |
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farmrjohn
Joined: 31 Dec 2018
Posts: 55
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| Posted: Sat Jan 23, 2021 1:04 pm Post subject: Re: Zeftronics Regulator Connection Question |
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This installation is not in a Cessna but on an Aircoupe with an O200 engine wtih alternator vs. the C90 it came with. It also does not have the over voltage sensor installed, rather utilizes the EI voltage meter for warning. It looks like the middle diagram on page 3 of the Zeftronics trouble shooting guide would show what happens and how it works if the alternator control switch is connected direct to the I terminal vs. the S terminal if I'm interpreting it correctly. John
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