Today's Message Index:
----------------------
1. 12:19 AM - Field alternator circuit breaker (John Karnes)
2. 04:59 AM - Re: Stereo output (James E. Clark)
3. 06:31 AM - Re: Field alternator circuit breaker (JSMONDAY@aol.com)
4. 06:32 AM - King KI208 connector (Cameron Kurth)
5. 06:40 AM - Re: Field alternator circuit breaker (Dale Martin)
6. 06:55 AM - Re: Rotax - Grounding of Shielded Ignition (Robert L. Nuckolls, III)
7. 06:57 AM - Re: Z-16 Proposed Rearrangement (Robert L. Nuckolls, III)
8. 09:21 AM - MIL-W-22759/16 flammability ? (Pascal Gosselin)
9. 10:17 AM - Re: Filter for Garmin GPS 400 ??!? (GT)
10. 12:43 PM - Re: Field alternator circuit breaker (John Karnes)
11. 02:24 PM - Round connector with D-sub pins? (N1deltawhiskey@aol.com)
12. 04:31 PM - Looking for source to purchase filament light for Cessna Radio (Sperry RT385A) (David Hartley)
13. 05:13 PM - Re: Round connector with D-sub pins? (Greg.Puckett@united.com)
14. 07:49 PM - Re: Round connector with D-sub pins? (Robert L. Nuckolls, III)
15. 07:52 PM - Re: Round connector with D-sub pins? (Robert L. Nuckolls, III)
16. 08:09 PM - Re: Looking for source to purchase filament light for Cessna (flmike)
17. 08:10 PM - Re: MIL-W-22759/16 flammability ? (Robert L. Nuckolls, III)
18. 08:16 PM - King KR-22 wiring diagram (Robin Wessel)
19. 08:30 PM - Re: Field alternator circuit breaker (Robert L. Nuckolls, III)
20. 08:34 PM - Re: King KR-22 wiring diagram (Jeff Orear)
21. 10:10 PM - Re: Z-16 Proposed Rearrangement (Kingsley Hurst)
22. 10:32 PM - LOAD DUMP--- Protection design test status (Paul Messinger)
23. 11:16 PM - Looking for an MS27467T9B35S connector (richard@riley.net)
Message 1
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| Subject: | Field alternator circuit breaker |
--> AeroElectric-List message posted by: "John Karnes" <jpkarnes@earthlink.net>
During my last flight, the 5A field alternator circuit breaker tripped,
which took the alternator offline. Cut back on electricity draining
devices and made it home safe and sound. I also had a second battery I
could have brought on line if I needed it.
Took the alternator to the auto store and it checked out fine. The output
cable from the alternator was loose when I pulled it out of the airplane,
so thought that might be the problem. I put it back in, cinched on the
bolt and took off to test it. My output was better @ 13.5 volts...until
the circuit breaker tripped again.
I'm wondering what I should be looking for that might be causing this
phenomenon. I have the crowbar overvoltage component from B&C. The
alternator doesn't appear to be putting out too much voltage, though. Any
ideas where I should look?
John Karnes
Zenith 601 HDS
Port Orchard, WA
Message 2
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--> AeroElectric-List message posted by: "James E. Clark" <james@nextupventures.com>
Works fine.
I have had no complaints about volume from anyone in about 300 hours of
flight time on the plane.
I seem to recall that the intercom has a gain of "1" so your supply needs to
have enough "ummph" to drive the headset to a decent level. The problem I
have with going to the speaker out is that some of these radios have 30-50
watt output amps on them!! Easy to blow your $1000 Bose with your $100 Sony.
I prefer to just crank the volume level up (takes about 3/4 of total) to a
level that is comfortable.
James
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
> [mailto:owner-aeroelectric-list-server@matronics.com]On Behalf Of Dave
> von Linsowe
> Sent: Tuesday, March 30, 2004 12:31 AM
> To: aeroelectric-list@matronics.com
> Subject: Re: AeroElectric-List: Stereo output
>
>
> --> AeroElectric-List message posted by: "Dave von Linsowe"
> <davevon@tir.com>
>
> I had originally intended to use the RCA jacks which are the
> "line out" intended for use with an amplifier, but the tech at
> DRE told me to use the speaker lines to get enough volume.
>
> So has there been any issue with having enough volume?
>
> Thanks,
>
> Dave
> ----- Original Message -----
> From: James E. Clark
> To: aeroelectric-list@matronics.com
> Sent: Monday, March 29, 2004 9:59 PM
> Subject: RE: AeroElectric-List: Stereo output
>
>
> --> AeroElectric-List message posted by: "James E. Clark"
> <james@nextupventures.com>
>
> I think I just took the stereo output of our Sony AM/FM/CD (via
> RCA jacks)
> to the input of our DRE-244e.
>
> James
>
>
> > -----Original Message-----
> > From: owner-aeroelectric-list-server@matronics.com
> > [mailto:owner-aeroelectric-list-server@matronics.com]On Behalf Of Dave
> > von Linsowe
> > Sent: Monday, March 29, 2004 1:38 PM
> > To: aeroelectric-list@matronics.com
> > Subject: AeroElectric-List: Stereo output
> >
> >
> > --> AeroElectric-List message posted by: "Dave von Linsowe"
> > <davevon@tir.com>
> >
> > Hi guys,
> >
> > I'm upgrading the AM FM CD player in my RV-6 and ran into
> > something that caught me off guard.
> >
> > The original stereo was setup with the output shielded from
> > inside the case. The new stereo has no provision for doing that.
> > Old stereo was a Eclipse and a Flight come 403 intercom. The
> > new setup is JVC stereo and a DRE-244e intercom.
> >
> > The question: Is it necessary to shield the output from the
> > stereo to the intercom? If it necessary to shield it, can I
> > start the shielding from the stereo at the stereo harness?
> >
> > Thanks for your help,
> >
> > Dave
> >
> >
>
>
Message 3
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| Subject: | Re: Field alternator circuit breaker |
--> AeroElectric-List message posted by: JSMONDAY@aol.com
Just had a similiar problem.... seems a com radio was drawing a whole lot of
juice during transmit... happened a couple of times, wasn't sure what it was
just noticed it was popped, but then the radio fryed on transmit and popped
both alternator breakers! Might check and see if it is popping under load.
John Monday
KR2S
Laguna Beach, CA
Message 4
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| Subject: | King KI208 connector |
--> AeroElectric-List message posted by: Cameron Kurth <n916kilo@yahoo.com>
Does anyone know where I can find a connector for a King KI208? I've called all
the avionics shops around here and they won't even order one for me.
Thanks
Cam
Message 5
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| Subject: | Re: Field alternator circuit breaker |
--> AeroElectric-List message posted by: "Dale Martin" <niceez@cableone.net>
You are not the first person to have this problem -
Start looking fro rubbed through insulation to bare wire, the ends of the
connections making contact or and short to ground.
Over time, (and many positive G's ;-)) I think one of the wire on this
airplane had rubbed through the insulation and was causing a fault just like
yours. My cure was to remake the entire electrical system while perform
panel upgrade surgery.
Dr Martin ;-)
----- Original Message -----
From: "John Karnes" <jpkarnes@earthlink.net>
Subject: AeroElectric-List: Field alternator circuit breaker
> --> AeroElectric-List message posted by: "John Karnes"
<jpkarnes@earthlink.net>
>
> During my last flight, the 5A field alternator circuit breaker tripped,
> which took the alternator offline. Cut back on electricity draining
> devices and made it home safe and sound. I also had a second battery I
> could have brought on line if I needed it.
>
> Took the alternator to the auto store and it checked out fine. The output
> cable from the alternator was loose when I pulled it out of the airplane,
> so thought that might be the problem. I put it back in, cinched on the
> bolt and took off to test it. My output was better @ 13.5 volts...until
> the circuit breaker tripped again.
>
> I'm wondering what I should be looking for that might be causing this
> phenomenon. I have the crowbar overvoltage component from B&C. The
> alternator doesn't appear to be putting out too much voltage, though. Any
> ideas where I should look?
>
> John Karnes
> Zenith 601 HDS
> Port Orchard, WA
>
>
Message 6
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| Subject: | Re: Rotax - Grounding of Shielded Ignition |
Switch Wires
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 04:52 PM 3/30/2004 +1000, you wrote:
>--> AeroElectric-List message posted by: "Kingsley Hurst"
><khurst@taroom.qld.gov.au>
>
>Bob,
>
>Rotax stipulate that the shielding of the wires to the ignition switches
>should be grounded at BOTH ends.
>
>I would really like to wire mine as per Z-16 so am trying to convince
>myself that by virtue of making these shields common at the ignition
>switches like you do, they are in fact grounded at both ends.
No, Figure Z-16 uses the shields to supply a ground to the
ignition switches. The shields find electrical system ground
at the engine end only . . .
>
>
>Is this correct?
There are over 100,000 airplanes flying wherein the "if-one-ground-
is-good-two-is-better" doctrine has been applied and the engine
functions just fine. However, there are many airplanes also flying
wired per figure Z-16 and the engine functions fine too. The
two-grounds or not-two-grounds question has more to do with noise
and ground loop avoidance which is almost never a concern for the
average power-plant guy. Either technique will not affect the
operation of your power plant and many aircraft operate in both
configurations.
Figure Z-16 is the best we know how to do in planning
ahead for avoiding future problems and is pretty low on the list
of concerns. Two grounds present a significant risk to ship's
wiring when the engine tries to find cranking current ground
through other wires if the crankcase jumper is left off. Had
a mechanic on our airport do it twice! I didn't give him
a third chance . . .
Bob . . .
-----------------------------------------
( Experience and common sense cannot be )
( replaced with policy and procedures. )
( R. L. Nuckolls III )
-----------------------------------------
Message 7
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| Subject: | Re: Z-16 Proposed Rearrangement |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 04:20 PM 3/30/2004 +1000, you wrote:
>--> AeroElectric-List message posted by: "Kingsley Hurst"
><khurst@taroom.qld.gov.au>
>
>Bob et.al.
>
>I have a Rotax 912 and I thought (Z-16 as is) was ideal for my purpose
>until I did a load analysis which threw me into a quandary.
>
>I found that I was left with only two items on the Main Bus and
>everything else was on the Endurance Bus (nee Essential Bus) and it
>seemed to me to be a bit of a misnomer to call a bus the Main Bus with
>only two items on it. I also have an electric trim which ideally should
>be fed directly from the battery.
>
>I am therefore contemplating changing the Endurance Bus to a Battery Bus
>(for the trim + a couple of other items) to be connected as per Z-16 but
>without the alternate feed switch and putting everything else on the
>Main Bus. To accommodate failure of the main contactor (ie to provide
>an alternate feed to the Main Bus), I am proposing a three or four pole,
>double throw switch (30VDC 20A contacts) be connected between the
>battery side of the main contactor and the Main Bus ie in parallel with
>the main contactor using the normally open contacts of two or three
>poles of this switch for this purpose. The only problem I can see is
>that when this switch is turned on, there is now a current path
>available through it for the starter contactor. To prohibit this, I am
>proposing to put the normally closed side of one of the poles of the
>same switch in series with the Starter Switch circuit to the starter
>contactor. The diode between the Main Bus and the Endurance Bus on Z-16
>would no longer be necessary.
>
>Caveat - all items on the Main Bus will be controlled by their own
>on/off switches for load shedding purposes.
>
>My question:- Is this idea sound or is there something glaringly wrong
>with this proposition?
>
>Thank you in anticipation.
>
>Kingsley Hurst
>Europa Builder in Oz.
What items are powered from each bus?
Bob . . .
Message 8
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| Subject: | MIL-W-22759/16 flammability ? |
--> AeroElectric-List message posted by: Pascal Gosselin <pascal@aeroteknic.com>
Has anyone here had to deal with this nonsense ?
http://www.tc.gc.ca/CivilAviation/certification/engineering/avionics/Workshop03/V0311-08.htm
We buy our wiring from EDMO, I'm trying to reach them for a comment on this
but their phones seem overly busy this morning.
-Pascal
+---------------------------+
Pascal Gosselin
pascal@aeroteknic.com
tel. (450) 676-6299
fax. (450) 676-2760
cell. (514) 298-3343
Message 9
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| Subject: | Re: Filter for Garmin GPS 400 ??!? |
--> AeroElectric-List message posted by: "GT" <Gilles.Thesee@ac-grenoble.fr>
Bruce,
Thank you for your response.
Regards,
Gilles Thesee
Grenoble, France
----- Original Message -----
From: "Bruce Gray" <Bruce@glasair.org>
Subject: RE: AeroElectric-List: Filter for Garmin GPS 400 ??!?
> --> AeroElectric-List message posted by: "Bruce Gray" <Bruce@glasair.org>
>
> Yes, he's talking about the notch filter.
>
> Bruce
> www.glasair.org
>
....................................
>
> Is it possible he was talking of a NOTCH filter to be intalles on the
> TRANSCEIVER antenna, as specified in the GPS intallation manual ?
>
> Thanks,
>
> Gilles
Message 10
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| Subject: | Re: Field alternator circuit breaker |
--> AeroElectric-List message posted by: "John Karnes" <jpkarnes@earthlink.net>
> You are not the first person to have this problem -
>
> Start looking fro rubbed through insulation to bare wire, the ends of the
> connections making contact or and short to ground.
If a wire were shorted to ground on a circuit protected by a fuse, wouldn't
the fuse blow? Should I limit my search some wire not protected by a fuse?
John Karnes
N601JK
Message 11
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| Subject: | Round connector with D-sub pins? |
--> AeroElectric-List message posted by: N1deltawhiskey@aol.com
Bob,
Are you aware of a round connector that uses the same pins as the standard
D-sub connector? If so, source?
Can use a standard connector in my application, but round would be easier.
Don't want to go the route of another pin type with new crimper.
TIA for a great service provided.
Regards, Doug Windhorn
Message 12
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| Subject: | Looking for source to purchase filament light for Cessna |
Radio (Sperry RT385A)
--> AeroElectric-List message posted by: "David Hartley" <DHartley@aascworld.com>
Hello, I am looking for a source to purchase the filament bulb that displays the
frequency digits in a Cessna Radio made by Sperry. The local avionics shop wants
$100 each, and they frequently burn out, leaving the radio basically useless.
I don't know who manufactures them, but they have a "107" part mark on them,
have 16 prongs, and measure about 7/16" wide by 7/8" tall . My previous post
erroneously indicated that these were LED's. Any help on locating these would
be appreciated. Thanks.
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
CONFIDENTIALITY NOTICE: If you have received this e-mail in error, please immediately
notify the sender by e-mail at the address shown. This e-mail transmission
may contain confidential information. This information is intended only
for the use of the individual(s) or entity to whom it is intended even if addressed
incorrectly. Please delete it from your files if you are not the intended
recipient. Thank you for your compliance
Message 13
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| Subject: | RE: Round connector with D-sub pins? |
--> AeroElectric-List message posted by: Greg.Puckett@united.com
Doug,
I used an AMP CPC (circular plastic connector) series 2. They uses
standard d-sub pins and sockets and are available from allied
electronics.
see:
http://www.alliedelec.com/catalog/pf.asp=3FFN91.pdf
Greg Puckett
Subject: Round connector with D-sub pins=3F
From: N1deltawhiskey@aol.com
=2D-> AeroElectric-List message posted by: N1deltawhiskey@aol.com
Bob,
Are you aware of a round connector that uses the same pins as the
standard
D-sub connector=3F If so, source=3F
Can use a standard connector in my application, but round would be
easier.
Don't want to go the route of another pin type with new crimper.
TIA for a great service provided.
Regards, Doug Windhorn
Message 14
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| Subject: | Re: Round connector with D-sub pins? |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 05:23 PM 3/30/2004 -0500, you wrote:
>--> AeroElectric-List message posted by: N1deltawhiskey@aol.com
>
>Bob,
>
>Are you aware of a round connector that uses the same pins as the standard
>D-sub connector? If so, source?
>
>Can use a standard connector in my application, but round would be easier.
>Don't want to go the route of another pin type with new crimper.
See the Series 2 Circular Plastic connectors on
http://dkc3.digikey.com/PDF/T041/0222.pdf
>TIA for a great service provided.
You're welcome!
Bob . . .
-----------------------------------------
( Experience and common sense cannot be )
( replaced with policy and procedures. )
( R. L. Nuckolls III )
-----------------------------------------
Message 15
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| Subject: | Re: Round connector with D-sub pins? |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 05:23 PM 3/30/2004 -0500, you wrote:
>--> AeroElectric-List message posted by: N1deltawhiskey@aol.com
>
>Bob,
>
>Are you aware of a round connector that uses the same pins as the standard
>D-sub connector? If so, source?
>
>Can use a standard connector in my application, but round would be easier.
>Don't want to go the route of another pin type with new crimper.
See the Series 2 Circular Plastic connectors on
http://dkc3.digikey.com/PDF/T041/0222.pdf
>TIA for a great service provided.
You're welcome!
Bob . . .
-----------------------------------------
( Experience and common sense cannot be )
( replaced with policy and procedures. )
( R. L. Nuckolls III )
-----------------------------------------
Message 16
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| Subject: | Re: Looking for source to purchase filament light for |
Cessna
--> AeroElectric-List message posted by: flmike <flmike2001@yahoo.com>
Try Wamco
I used them on a gov't project many moons ago and they
still make em. Be advised though, they are not likely
to be cheap. Not many users of that technology
anymore. Give them a call, good folks.
www.wamcoinc.com
fl-mike
__________________________________
Message 17
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| Subject: | Re: MIL-W-22759/16 flammability ? |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 12:21 PM 3/30/2004 -0500, you wrote:
>--> AeroElectric-List message posted by: Pascal Gosselin
><pascal@aeroteknic.com>
>
>
>Has anyone here had to deal with this nonsense ?
>
>http://www.tc.gc.ca/CivilAviation/certification/engineering/avionics/Workshop03/V0311-08.htm
>
>We buy our wiring from EDMO, I'm trying to reach them for a comment on this
>but their phones seem overly busy this morning.
>
>-Pascal
First I've heard of any "problems" with this wire. It's been
the material of choice at RAC for nearly 30 years. While
perhaps a significant design concern on air transport category
aircraft, I'll suggest it's a tempest-in-a-teapot for
little airplanes. I wouldn't loose any sleep over it.
Bob . . .
Message 18
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| Subject: | King KR-22 wiring diagram |
--> AeroElectric-List message posted by: "Robin Wessel" <Robin.Wessel@verizon.net>
I just bought a used KR-22 marker beacon rec. off of e-bay.
Does anyone have access to a wiring diagram?
Additionally, I looked up Mouser, Digi-key, and Molex for a 18 pin edge
card connector for as well. Any sources beyond a $100 install kit from
king?
thanks,
robin wessel
RV-10 wings
Tigard, OR
---
Message 19
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| Subject: | Re: Field alternator circuit breaker |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 12:18 AM 3/30/2004 -0800, you wrote:
>--> AeroElectric-List message posted by: "John Karnes"
><jpkarnes@earthlink.net>
>
>During my last flight, the 5A field alternator circuit breaker tripped,
>which took the alternator offline. Cut back on electricity draining
>devices and made it home safe and sound. I also had a second battery I
>could have brought on line if I needed it.
>
>Took the alternator to the auto store and it checked out fine. The output
>cable from the alternator was loose when I pulled it out of the airplane,
>so thought that might be the problem. I put it back in, cinched on the
>bolt and took off to test it. My output was better @ 13.5 volts...until
>the circuit breaker tripped again.
13.5 volts is a tad low. What kind of voltage regulator are you
using? Were you switching any other accessory(ies) when the trip
occurred?
What has your voltage been running in recent flights before the
trip?
Bob . . .
-----------------------------------------
( Experience and common sense cannot be )
( replaced with policy and procedures. )
( R. L. Nuckolls III )
-----------------------------------------
Message 20
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| Subject: | Re: King KR-22 wiring diagram |
--> AeroElectric-List message posted by: "Jeff Orear" <jorear@new.rr.com>
Robin:
Try contacting Eastern Avionics for the molex connector. Very helpful
folks. They even may be able to help you out with the wiring diagram.
Go to www.easternavionics.com and check their inventory. I would advise
calling them too to make sure they have what is listed.
Regards,
Jeff Orear
RV6A
Panel
Peshtigo, WI
----- Original Message -----
From: "Robin Wessel" <Robin.Wessel@verizon.net>
Subject: AeroElectric-List: King KR-22 wiring diagram
> --> AeroElectric-List message posted by: "Robin Wessel"
<Robin.Wessel@verizon.net>
>
> I just bought a used KR-22 marker beacon rec. off of e-bay.
>
> Does anyone have access to a wiring diagram?
>
> Additionally, I looked up Mouser, Digi-key, and Molex for a 18 pin edge
> card connector for as well. Any sources beyond a $100 install kit from
> king?
>
> thanks,
>
> robin wessel
> RV-10 wings
> Tigard, OR
>
> ---
>
>
Message 21
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| Subject: | Z-16 Proposed Rearrangement |
--> AeroElectric-List message posted by: "Kingsley Hurst" <khurst@taroom.qld.gov.au>
Bob,
In relation to my original message below, you asked ...... What items
are powered from each bus?
Not sure if you mean each bus as per original Z-16 or the busses I am
proposing so will list what I am proposing.
MAIN BUS - normal feed as per Z-16 plus alternate feed thru proposed
multipole switch.
AH - electronic
Airmaster CS propeller
Auto Pilot
Engine Monitor
Fuel pump (Facet) - backs up mech pump
GPS
OV disconnect relay
Radio VHF
Starter contactor circuit
Strobe
Tacho
Transponder
Turn co-ordinator
Correction to yesterday's posting ........... All items on the main bus
with the exception of OV disconnect relay, Starter Relay circuit and
Tacho will be able to be switched off.
BATTERY BUS
MAC electric trim
Cabin & Panel Flood lights
Aux Power Outlets - for tyre pump, decanting fuel pump, airbed pump etc.
Bob, this was not a consideration when I thought of the idea as I have
only just this moment realised that as per standard Z-16, a battery
contactor failure (rare I know) would automatically put the alternator
off line. The switch I am proposing would allow alternator power to be
restored for this failure mode. Not a big deal I know but can't see why
this option would be a bad thing.
Be gentle on me please....... promise not to laugh and thanks again for
your time.
Kingsley
********************************************************
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Robert L. Nuckolls, III
Subject: Re: AeroElectric-List: Z-16 Proposed Rearrangement
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III"
<bob.nuckolls@cox.net>
At 04:20 PM 3/30/2004 +1000, you wrote:
>--> AeroElectric-List message posted by: "Kingsley Hurst"
><khurst@taroom.qld.gov.au>
>
>Bob et.al.
>
>I have a Rotax 912 and I thought (Z-16 as is) was ideal for my purpose
>until I did a load analysis which threw me into a quandary.
>
>I found that I was left with only two items on the Main Bus and
>everything else was on the Endurance Bus (nee Essential Bus) and it
>seemed to me to be a bit of a misnomer to call a bus the Main Bus with
>only two items on it. I also have an electric trim which ideally
should
>be fed directly from the battery.
>
>I am therefore contemplating changing the Endurance Bus to a Battery
Bus
>(for the trim + a couple of other items) to be connected as per Z-16
but
>without the alternate feed switch and putting everything else on the
>Main Bus. To accommodate failure of the main contactor (ie to provide
>an alternate feed to the Main Bus), I am proposing a three or four
pole,
>double throw switch (30VDC 20A contacts) be connected between the
>battery side of the main contactor and the Main Bus ie in parallel with
>the main contactor using the normally open contacts of two or three
>poles of this switch for this purpose. The only problem I can see is
>that when this switch is turned on, there is now a current path
>available through it for the starter contactor. To prohibit this, I am
>proposing to put the normally closed side of one of the poles of the
>same switch in series with the Starter Switch circuit to the starter
>contactor. The diode between the Main Bus and the Endurance Bus on
Z-16
>would no longer be necessary.
>
>Caveat - all items on the Main Bus will be controlled by their own
>on/off switches for load shedding purposes.
>
>My question:- Is this idea sound or is there something glaringly wrong
>with this proposition?
>
>Thank you in anticipation.
>
>Kingsley Hurst
>Europa Builder in Oz.
What items are powered from each bus?
Bob . . .
==
==
==
==
Message 22
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| Subject: | LOAD DUMP--- Protection design test status |
--> AeroElectric-List message posted by: "Paul Messinger" <paulm@olypen.com>
This is just a update of progress so far in defining the characteristics of
the Alternator Load Dump and how to clamp it to prevent other system damage
from overvoltage during an Load Dump event (hopefully you will never have
one :-) ).
I am teamed (remotely as he is on the other side of the USA) with another
excellent engineer and we have two different designs that both show promise.
I now have all the materials and all the test equipment to test and
characterize load dumps of up to 40 amps using AC motor driven alternators
of 55-60 amp rating; one with an internal regulator, and one with an exernal
regulator.
Once the dump is characterized (using real alternators) a capacitor bank of
up to 200,000 mfd TBD will be charged to up to 80 volts TBD and discharged
thru 2 ohms TBD to simulate the event in a more repeatable way. Dumps of 10
thru 40 amps will be simulated and the supressor designs will be evaluated.
The initial design goal is for voltage clamping to start at 17V and limit
the peak V to under 20V to cover some electronics that have 20V max ratings.
Also it appears this is an achievable design requirement. Both designs are a
simple two terminal device so it will be easy to install.
The test schedule, like everything done on a "time available", is behind my
original estimate and I now expect to have reportable results late in April.
Success schedule! :-)
The test equipment is Calibrated Tektronics and results will include voltage
and current waveforms as well as other parameters and the specific test
setups.
Paul
Message 23
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| Subject: | Looking for an MS27467T9B35S connector |
--> AeroElectric-List message posted by: richard@riley.net
Anyone know where I can get one for less than it's weight in gold? The
best I've found so far is a minimum 2 order at $75 each.
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