Today's Message Index:
----------------------
1. 05:57 AM - Diodes 101 (Lui Esc)
2. 06:33 AM - Re: Split Pin Connectors? ()
3. 07:14 AM - Re: Diodes 101 (chad-c_sip@stanfordalumni.org)
4. 07:14 AM - Re: Diodes 101 (Robert L. Nuckolls, III)
5. 07:19 AM - Re: Z13 with B&C Alt/Reg combination ? (Robert L. Nuckolls, III)
6. 08:33 AM - Re: Re: Help - low voltage - update (Robert L. Nuckolls, III)
7. 08:35 AM - Re: Help - low voltage - update (P.S.) (Robert L. Nuckolls, III)
8. 09:04 AM - Re: alternator testing (Mark & Lisa)
9. 09:06 AM - Re: 24V Starter (Mark & Lisa)
10. 09:32 AM - Overvoltage and PM alternators (Jon Goguen)
11. 05:54 PM - Fw: Diagnostic voltages for Alternator (Rick Fogerson)
Message 1
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--> AeroElectric-List message posted by: "Lui Esc" <f1rocketbuilder@hotmail.com>
Does anyone knows if there is any document that covers Diodes by themselves?
I have a few gray areas understanding which diode to use, identify, rating,
etc.
There are several diodes shown on the Aeroelectric diagrams but I can't see
part numbers to reference. Ex. a diode between the essential bus and the
primary bus, also, diode on the starter seleniod.
I need to use some diodes in other areas but, I am still learning and want
to be sure I use/order the correct stuff.
I sent an email to Bob via his web site, but I did not hear back from him.
I just learned about this forum, so I subscribed to the Digest.
Thanks,
LE
Comments/Questions: Building a F-1 Rocket. Love your publications, learned
a lot thanks to you. But continue trying to learn and understand the
electric side as much as I can since I am doing the wiring by myself. Do
you have a document that covers Diodes by themselves? I have a gray area
trying to identify part number or diode required on certain areas mentioned
in your publications. Ex. a diode between the essential bus and the primary
bus and others. Thanks. Luis
Message 2
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| Subject: | Re: Split Pin Connectors? |
--> AeroElectric-List message posted by: <bakerocb@cox.net>
Aeroelectric-list message previously posted by Bob Nuckolls
<<....skip....What's the brand and model number of the autopilot?
One can often deduce the connector technology by knowing
who made the system. Manufacturers often have a stable
of connectors-of-choice. Getting a peek at the installation/
maintenance manual for the autopilot may help. Was the
autopilot installed as a Beechcraft option? If so, I
may have access to data in the company archives that
would help. Bob . . .>>
7/1/2005
Hello Bob Nuckolls, I am the owner of the Beechcraft Sierra with autopilot
problems that OC Baker referred to . In answer to your response I can
provide the following additional data, and any help/suggestions you provide
would be greatly appreciated.
The POH for the Beechcraft Sierra C24R depicts an autopilot in the
instrument panes for all a/c after serial no. MC 571. My a/c, serial no. is
MC 778 mfg'd in 1982. However, the POH does not provide any information on
the autopilot itself. Neither the logs nor the weight and balance sheets
mention an autopilot add-on. I therefore am led to believe that it was a
factory install at time of delivery. The autopilot itself is a Century IIB
mfg'd by Flight Systems, Inc. PO Box 610, Mineral Wells, TX 76067. As to
"split pin connectors", another Sierra owner offers that the techie was
referring to the "Little Blue Plugs used by Century for many of their
autopilot connections. They have stamped receptor pins rather than solid
ones."
Does any of this additional info help shed some light on the problem? Thanks
for you help. George Philipps
Message 3
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Z-USANET-MsgId: XID223JgkoNs0424X37
--> AeroElectric-List message posted by: chad-c_sip@stanfordalumni.org
A good ol' Google Search on "diode tutorial" brought up this link:
http://www.americanmicrosemi.com/tutorials/diode.htm
It seemed like a good introduction. At least from that you know the
terminology used when describing a diode. And now you can compare the
performance of different beasties. The only other thing I'd add is that "full
wave rectifiers" are really just 4 diodes laid out nose-to-tail in a diamond
pattern. We tend to talk about rectifiers as power diodes are they already
come in larger power packages ready to be attached to a heat sink. And there's
no reason you can't simply use only one of the 4 diodes in the package.
Good luck.
Chad
Chad Sipperley
Lancair IV-P turbine (under construction)
Phoenix, AZ
------ Original Message ------
From: "Lui Esc" <f1rocketbuilder@hotmail.com>
Subject: AeroElectric-List: Diodes 101
> --> AeroElectric-List message posted by: "Lui Esc"
<f1rocketbuilder@hotmail.com>
>
> Does anyone knows if there is any document that covers Diodes by
themselves?
> I have a few gray areas understanding which diode to use, identify, rating,
> etc.
>
> There are several diodes shown on the Aeroelectric diagrams but I can't see
> part numbers to reference. Ex. a diode between the essential bus and the
> primary bus, also, diode on the starter seleniod.
>
> I need to use some diodes in other areas but, I am still learning and want
> to be sure I use/order the correct stuff.
>
> I sent an email to Bob via his web site, but I did not hear back from him.
> I just learned about this forum, so I subscribed to the Digest.
>
> Thanks,
> LE
>
>
> Comments/Questions: Building a F-1 Rocket. Love your publications, learned
> a lot thanks to you. But continue trying to learn and understand the
> electric side as much as I can since I am doing the wiring by myself. Do
> you have a document that covers Diodes by themselves? I have a gray area
> trying to identify part number or diode required on certain areas mentioned
> in your publications. Ex. a diode between the essential bus and the primary
> bus and others. Thanks. Luis
>
>
>
>
>
>
>
Message 4
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--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr@cox.net>
At 07:56 AM 7/11/2005 -0500, you wrote:
>--> AeroElectric-List message posted by: "Lui Esc"
><f1rocketbuilder@hotmail.com>
>
>Does anyone knows if there is any document that covers Diodes by themselves?
>I have a few gray areas understanding which diode to use, identify, rating,
>etc.
>
>There are several diodes shown on the Aeroelectric diagrams but I can't see
>part numbers to reference. Ex. a diode between the essential bus and the
>primary bus, also, diode on the starter seleniod.
>
>I need to use some diodes in other areas but, I am still learning and want
>to be sure I use/order the correct stuff.
>
>I sent an email to Bob via his web site, but I did not hear back from him.
>I just learned about this forum, so I subscribed to the Digest.
ANY rectifier diode that LOOKs like this will do:
http://www.aeroelectric.com/Pictures/s401-25.jpg
Here's an excerpt from the Radio Shack catalog:
http://www.aeroelectric.com/Pictures/RS_Diodes.jpg
Note that it offers an 276-1185 full wave bridge rectifier
which is suited for use as the e-bus normal feed diode illustrated
above
It also offers the 1N540X series diodes which
are my favorites for use on contactors. These are
mechanically more robust and easy to work with.
See:
http://www.aeroelectric.com/Pictures/s701-1l.jpg
http://www.aeroelectric.com/Pictures/s701-2.jpg
If the 5400 series are too heavy mechanically
for your application, consider the 1N400x series
on the same page.
A typical useage for the 4000 series is shown
here:
http://www.aeroelectric.com/Pictures/s704inst.jpg
Ratings for diodes used as spike catchers is
not critical. Only the e-bus normal feed diode
needs to have some electrical heftiness and
the 276-1185 or any of its siblings will be fine.
If it comes in this package, then it's big enough.
See note 12 of
http://aeroelectric.com/articles/Rev11/AppZ_R11C.pdf
and
http://aeroelectric.com/articles/spikecatcher.pdf
Bob . . .
Message 5
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| Subject: | Re: Z13 with B&C Alt/Reg combination ? |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr@cox.net>
At 10:35 PM 7/10/2005 -0500, you wrote:
>--> AeroElectric-List message posted by: "Bill Schlatterer"
><billschlatterer@sbcglobal.net>
>
>
>Bob, am I missing something? I was looking for the Z13 diagram with the B&C
>alt/reg combination and can't seem to find it. Would be great to see with
>P-mag but assume you can just add in the R11C Z13 w/P-Mags.
>
>Bill S
>RV7a Arkansas
The z-figures are crafted to illustrate architectures, not to make
specific recommendations for use of parts. I COULD craft a dozen
z-13's, each depicting a different regulator, alternator, etc.
Usage of the LR-3 series devices is illustrated in several
other z-figures . . . if that's your regulator of choice for
Z-13, then you'll need to draw out your own power distribution
diagram modified to include your features of choice.
EVERYONE should do their own power distribution diagrams to
exactly match their project. The Z-figures are only a guide to
get you started.
Bob . . .
Message 6
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| Subject: | Re: Help - low voltage - update |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr@cox.net>
Before you pull anything off the airplane, let's do a good job of
diagnosis to KNOW which part needs attention. I've got a piece nearly
finished on alternator system troubleshooting that I'll publish on
the website in next day or so along with links from this list.
Bob . . .
At 06:38 AM 7/9/2005 -0400, you wrote:
>--> AeroElectric-List message posted by: "Mike & Lee Anne Wiebe"
><mwiebe@sympatico.ca>
>
>Thx Jim - that makes some sense. I think it's time to pull the
>alternator and check the diode bridge.
>
>You raise another interesting idea. What do you think of this scenario?
>I recently changed the battery to a smaller one (had the Odessey 680
>ready to go for the new aircraft, so when it came time for a
>"Knuckoll's change-out" I replaced the large B&C with the Odessey). The
>alternator is the larger B&C, so alternator load shouldn't be the
>problem (presuming the diodes are OK). Do you think a change to a
>smaller battery might have changed the ability of the system to "sink"
>the pulsing load of the strobes, and make voltage vary more?
>
>I guess it's also possible that its done this since new, and I've just
>never noticed. Though somehow I think I would have before now.
>
>Mike
>
>
>--
>
>
>-- incoming mail is certified Virus Free.
Bob . . .
--------------------------------------------------------
< Throughout history, poverty is the normal condition >
< of man. Advances which permit this norm to be >
< exceeded -- here and there, now and then -- are the >
< work of an extremely small minority, frequently >
< despised, often condemned, and almost always opposed >
< by all right-thinking people. Whenever this tiny >
< minority is kept from creating, or (as sometimes >
< happens) is driven out of a society, the people >
< then slip back into abject poverty. >
< >
< This is known as "bad luck". >
< -Lazarus Long- >
<------------------------------------------------------>
http://www.aeroelectric.com
Message 7
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| Subject: | Re: Help - low voltage - update (P.S.) |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr@cox.net>
PS have you conducted the tests described in:
http://www.aeroelectric.com/articles/Alternators/Alternator_Test.pdf
This is the best way to isolate the problem with respect to
regulation or alternator issues . . .
B-
Before you pull anything off the airplane, let's do a good job of
diagnosis to KNOW which part needs attention. I've got a piece nearly
finished on alternator system troubleshooting that I'll publish on
the website in next day or so along with links from this list.
Bob . . .
Message 8
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| Subject: | Re: alternator testing |
--> AeroElectric-List message posted by: "Mark & Lisa" <marknlisa@hometel.com>
Bob,
Thanks again!
Mark & Lisa Sletten
Legacy FG N828LM
http://www.legacyfgbuilder.com
DO NOT ARCHIVE
Message 9
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--> AeroElectric-List message posted by: "Mark & Lisa" <marknlisa@hometel.com>
Jim,
Thank you too!
Mark & Lisa Sletten
Legacy FG N828LM
http://www.legacyfgbuilder.com
DO NOT ARCHIVE
Message 10
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| Subject: | Overvoltage and PM alternators |
--> AeroElectric-List message posted by: Jon Goguen <jon.goguen@umassmed.edu>
Hi All,
My first post to the list. I'm co-builder of the Kitfox described in
the signature along with my uncle Nelson Goguen. Most of what remains
to get the ship finished is electrical so here I am. I've read Bob's
Aeroeletric Connection and found it very informative, and very much
like his design philosophy and the principle that we should build
better than certified. I've had a lifelong interest in electronics
and instrumentation, and hope I might be able to make some useful
contributions to the community. Thanks in advance for all your relies.
Now down to business. I'm wondering about the importance of
overvoltage protection on PM alternators. Without a field coil,
extreme voltage runaway shouldn't be possible with these machines.
They do produce 30 volts or so, which could certainly be damaging if it
passed through the regulator, but I believe the regulators use a phase
control shunt-based design. If so, the shunting SCRs would virtually
always fail in the conducting mode, which would give low rather than
high voltage output. Does anyone know of a documented case of
overvoltage problems with a properly installed PM alternator?
Given the simplicity and reliability of PM alternators, it would seem
that the regulator is by far the weakest link in the charging system.
This would argue for a dual regulator design. I don't know enough
about the regulator innards to know if paralleling two of them would
result in undesirable interactions, but I suspect that it might. This
could be avoided by simply providing means to switch between the two
regulators.
So:
Does OV protection really make sense for a PM alternator system?
Would a dual-regulator design provide a worthwhile enhancement in
reliability?
Thanks!
Jon
Jon Goguen
jon.goguen@umassmed.edu
Central Massachusetts
Kitfox Series V Rotax 912S / N456JG (reserved)
Complete except for electrics and avionics
Message 11
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| Subject: | Fw: Diagnostic voltages for Alternator |
--> AeroElectric-List message posted by: "Rick Fogerson" <rickf@cableone.net>
Hi Bob,
If you answered this already I must have missed it. Would appreciate some numbers
as I don't have a clue what a high field voltage would be, etc.
Rick
----- Original Message -----
From: Rick Fogerson
Subject: Diagnostic voltages for Alternator
Hi Bob,
I put a jack in my airplane a la Page Z-6 for alternator diagnostics. I have B&C's
alternator and voltage regulator. Could I get some numbers/ranges to the
voltages for the descriptive words in the following paragraphs:
Paragraph (a) alt output is zero when the bus voltage is ______?
Paragraph (e) If the field voltage is high_____? and does not drop significantly_____?
when engine rpm increases but bus voltage seems normal under light load
and sags under heavy loads....
What would be the voltage regulators normal set point____?
Thanks Bob and have a great 4th of July,
Rick Fogerson
RV3 done, making POH
Boise, ID
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