Today's Message Index:
----------------------
1. 01:40 PM - downloadable notes that go with the "Z" diagrams... (Steve Stearns)
2. 01:53 PM - Alternator Disconnect Z17 vs Z20... (Steve Stearns)
3. 03:37 PM - fuse or breaker for OVP? (Ken Ryan)
4. 06:45 PM - Overvoltage crowbar availability? (Steve Stearns)
5. 06:59 PM - Never mind... Re: Overvoltage crowbar availability? (Steve Stearns)
6. 10:29 PM - Re: fuse or breaker for OVP? (Jeff Luckey)
Message 1
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Subject: | downloadable notes that go with the "Z" diagrams... |
Greetings,
Anyone have a link or a .pdf for the notes that go with the architecture
drawings? I couldn't find them on the aeroelectric website.
Thanks,
Steve Stearns
LongEz N45FC, currently working on a Quickie...
Message 2
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Subject: | Alternator Disconnect Z17 vs Z20... |
Greetings,
I'm currently working on wiring up a Quickie with a Rotax 503 (and a
glass panel, go figure...). The two architecture diagrams that look
appropriate to start from are Z17 "Small Rotax System" (sounds right...)
and Z20 "Small Jabiru System".
They are basically the same EXCEPT they way the alternator is
disconnected (Z17 is downstream of regulator, Z20 is upstream of the
regulator).
I might be mistaken (please correct me...) but it also appears both
diagrams are assuming more of a diode bridge than a real regulator as
they both show a 20,000uF cap on the output of the regulator.
My questions: 1) What's the significance, if any, of the different
approaches to the alternator disconnect? 2) If I use Rotax 264 870
regulator (as opposed to the 866 080 bridge) is the cap still
appropriate (it's not shown in Rotex's wiring diagrams?
All thoughts welcome.
Thanks,
Steve Stearns
LongEz N45FC (working on a Quickie)
Message 3
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Subject: | fuse or breaker for OVP? |
I read on another forum that the B&C over voltage protection thingy must
only be used to trip a breaker, not to blow a fuse. Yet, I just re-read the
chapter on over voltage protection and did not see that mentioned. So the
question is, should the OVP device be used to: a) trip a breaker b) blow a
fuse c) either is okay ?
Message 4
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Subject: | Overvoltage crowbar availability? |
Greetings,
It looks like B and C no longer carries the stand-alone overvoltage
crowbar (at least I think that's where I bought the one in my LongEz).
I know Bob is trying to get out of the parts distribution business.
Does anyone else know of a source or should I just plan on building my
own. (and if you have the link handy to Bob's schematic that would be
great but don't search if you don't as I'm sure I can find it...).
Thanks,
Steve Stearns
LongEz N45FC (and currently working on a Quickie).
Message 5
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Subject: | Re: Never mind... Re: Overvoltage crowbar availability? |
Found it. It's still available at B&C if you search by it's part number
OVM-14...
Sorry for the distraction,
Steve.
On 12/11/2014 7:43 PM, Steve Stearns wrote:
> Greetings,
>
> It looks like B and C no longer carries the stand-alone overvoltage
> crowbar (at least I think that's where I bought the one in my
> LongEz). I know Bob is trying to get out of the parts distribution
> business. Does anyone else know of a source or should I just plan on
> building my own. (and if you have the link handy to Bob's schematic
> that would be great but don't search if you don't as I'm sure I can
> find it...).
>
> Thanks,
>
> Steve Stearns
> LongEz N45FC (and currently working on a Quickie).
Message 6
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Subject: | Re: fuse or breaker for OVP? |
The idea behind feeding the Regulator with a circuit breaker is that it gives the
pilot the ability to shut-down the alternator (by pulling the breaker) if that
becomes necessary.
A few reasons you might want to shut down the alternator are:
1. a failed regulator that is giving full field (if you don't have an over voltage
module)
2. a failed over-voltage module
3. testing purposes
A breaker is simply more practical in this situation.
On Thursday, December 11, 2014 3:35 PM, Ken Ryan <keninalaska@gmail.com> wrote:
I read on another forum that the B&C over voltage protection thingy must only be
used to trip a breaker, not to blow a fuse. Yet, I just re-read the chapter
on over voltage protection and did not see that mentioned. So the question is,
should the OVP device be used to: a) trip a breaker b) blow a fuse c) either
is okay ?
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