Today's Message Index:
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1. 04:55 AM - Buy New Apple iPhone 12 Pro 5G 512GB Unlocked $1,149 (jeiaery)
2. 09:41 AM - Re: Melted battery contractor ground wire (frank3)
3. 09:47 AM - Re: (Roger & Jean)
4. 09:55 AM - Re: Melted battery contractor ground wire (frank3)
5. 10:06 AM - Re: Re: Melted battery contractor ground wire (Jeff Luckey)
6. 10:31 AM - Re: (Sebastien)
7. 10:42 AM - Re: Re: Melted battery contractor ground wire (Charlie England)
8. 11:00 AM - Re: Melted battery contractor ground wire (user9253)
9. 02:26 PM - Re: Magnetized Dynon D100 Display (cskelt)
10. 03:36 PM - Re: Melted battery contractor ground wire (frank3)
11. 04:32 PM - Re: Re: Melted battery contractor ground wire (Robert L. Nuckolls, III)
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| Subject: | Buy New Apple iPhone 12 Pro 5G 512GB Unlocked $1,149 |
The Price is Canadian dollar. Visit Our Website www.esellibuy.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=502744#502744
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| Subject: | Re: Melted battery contractor ground wire |
Bob's questions answered:
1. Yes, the contactor has been functioning for a couple of months. I've been
using jumper cables to connect a lawn tractor battery so I can test components
as they are installed.
2. The measured resistance is 16.5 ohms, small terminal to battery side fat terminal
with diode removed. (The 0.016 value reported and questioned by Charlie
was using the wrong range).
3. There is no continuity between any of the terminals and the case.
4. This is a three terminal Cole Hersee provided by Vans Aircraft.
5. There was a spike supression diode installed, provided by Vans with terminals
and shrink tube insulation already installed. I peeled back the insulation
to ensure the diode was installed properly, with the band towards the fat terminal.
As you suggested, the diode is now nonfunctional.
Bob, the contactor is in the mail.
As Doug suggested (6 Jul #11) I went through the suggested process to test the
wiring and switch. Both were TRUE--both wiring and switch were proper.
BTW, I don't understand how a miss-wired switch could cause a direct short. My
understand is the switch simply enables the circuit to conduct current or not.
I can see the possibility of a short between the switch and the airframe but
don't understand miss-wiring. Something I need educating about?
Jeff, I submitted the pic with contactor installed. We'll see if it gets published.
Joe (7 Jul #5), you interpreted my post correctly. After reviewing schematics
I see I WAS lucky! (Might just as well connected the two jumper cables!!! Just
talking to myself)
Charlie (7 Jul #4), thanks for suggesting the video on battery contractors. It
was wired per the video. What you describe re: open circuits & resistance between
the terminals is what I was getting. I must not have described clearly.
And, as stated above, you were right to be suspicious of my #, I used the wrong
range.
Again, thanks to all for their interest, questions, and suggestions.
--------
Frank McDonald
Kitfox S7 - sold
RV7 in progress
Acworth, GA
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=502751#502751
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| Subject: | Re: Melted battery contractor ground wire |
Don't know if this is relevant but checked the fuses to all the circuits and found
the 5amp fuse to the Dynon EFIS was blown. EFIS was only open circuit at
the time of the incident. Evidence there must have been some kind of over voltage
event, I guess.
New fuse and using EBUS circuit I found the EFIS is good to go.
--------
Frank McDonald
Kitfox S7 - sold
RV7 in progress
Acworth, GA
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=502753#502753
Message 5
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| Subject: | Re: Melted battery contractor ground wire |
Is it possible that you inadvertently hooked-up the battery backwards that
day?
On Thursday, July 8, 2021, 10:02:12 AM PDT, frank3 <frank3phyl@comcast.
net> wrote:
Don't know if this is relevant but checked the fuses to all the circuits an
d found the 5amp fuse to the Dynon EFIS was blown.=C2- EFIS was only open
circuit at the time of the incident.=C2- Evidence there must have been s
ome kind of over voltage event, I guess.
New fuse and using EBUS circuit I found the EFIS is good to go.
--------
Frank McDonald
Kitfox S7 - sold
RV7 in progress
Acworth, GA
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=502753#502753
-
S -
WIKI -
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=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
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| Subject: | Re: ectric-List: |
I'm surprised you are surprised. Spam is a small problem right now compared
to what is coming.
Currently, large sections of the internet are constantly under attack by
advertisers and criminals. I was a moderator on one of the world's biggest
aviation forums and for every legitimate new member who joined and posted,
there were 10 ads or scams. In order to prevent the board from being
completely flooded, we had to block all new user's posts from being visible
until a moderator had checked it and decided whether or not it was
legitimate. This means that the spammers and scammers found it worthwhile
to create new accounts (as laborious a process as we could reasonably make
it) and then post dozens of messages from that account despite 99.999% of
those messages never being visible to anyone. Every once in a while there
was a real human involved in trying to get spam through and sometimes they
succeeded, usually by copying an existing post.
Right now the flood is being kept at bay fairly easily by a few minor
inconveniences for new users and a lot of effort by unpaid volunteers. Keep
in mind though that there is an almost unlimited amount of money being
spent on programming AI systems that will get much, much better at
pretending to be humans on the internet. Right now, over half of all emails
in the world are spam. In the next 50 years I think we will see 99% of
internet traffic turn into AI systems trying to figure out ways to
advertise and scam the humans still trying to enjoy this technology. It's
going to get to the point where the only way you will be allowed to
communicate with anyone over the internet (and phone system for that
matter) will be to have someone already in the system vouch for you. Unless
you know someone who can physically confirm that you exist and can pass
that introduction on to others, it will be assumed that you're an AI and
you will be blocked.
On Thu, Jul 8, 2021 at 9:52 AM Roger & Jean <rnjcurtis@charter.net> wrote:
> Why does this garbage keep appearing on the AeroElectric List?
>
>
> *From: *jeiaery <jeiaery@82ultra.com>
> *Sent: *Wednesday, July 7, 2021 10:33 PM
> *To: *aeroelectric-list@matronics.com
> *Subject: *AeroElectric-List: Buy New Apple iPhone 12 Pro 5G 256GB
> Original Unlocked $949
>
>
>
>
> The Price is Canadian dollar. Visit Our Website www.esellibuy.com
>
>
> Read this topic online here:
>
>
> http://forums.matronics.com/viewtopic.php?p=502743#502743
>
>
Message 7
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| Subject: | Re: Melted battery contractor ground wire |
My 1st thought, as well. That would explain smoking the spike
suppression diode on the contactor. Must have been God's Own suppression
diode, though, to take the wire with it.
Charlie
On 7/8/2021 12:06 PM, Jeff Luckey wrote:
> Is it possible that you inadvertently hooked-up the battery backwards
> that day?
>
> On Thursday, July 8, 2021, 10:02:12 AM PDT, frank3
> <frank3phyl@comcast.net> wrote:
>
>
> <frank3phyl@comcast.net <mailto:frank3phyl@comcast.net>>
>
> Don't know if this is relevant but checked the fuses to all the
> circuits and found the 5amp fuse to the Dynon EFIS was blown. EFIS
> was only open circuit at the time of the incident. Evidence there
> must have been some kind of over voltage event, I guess.
>
> New fuse and using EBUS circuit I found the EFIS is good to go.
>
> --------
> Frank McDonald
> Kitfox S7 - sold
> RV7 in progress
> Acworth, GA
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=502753#502753
> <http://forums.matronics.com/viewtopic.php?p=502753#502753>
>
>
> http://www.matronics.com/Navigator?AeroElectric-; - MATRONICS
> WEB FORUMS -
> http://forums.matronbsp; - NEW MATRONICS LIST WIKI -
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Message 8
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| Subject: | Re: Melted battery contractor ground wire |
I think that jluckey has solved the problem. Reverse battery polarity explains
the melted wire and the blown fuse. Luckily the EFIS was not damaged.
I predict that Bob N will not find anything wrong with the contactor. An over
voltage event is extremely unlikely without an alternator running.
It is pretty easy to reverse battery voltage when using jumper cables. One has
a 50-50 chance of getting it wrong.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=502757#502757
Message 9
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| Subject: | Re: Magnetized Dynon D100 Display |
The mystery of the magnetized EFIS has been solved. Don Jones of Dynon Technical
Support offered to send me a remanufactured D100 EFIS to swap out and to test
mine at their shop. I determined that the replacement had barely measurable
permanent magnetism in the same location as the original, but it was not enough
to affect the panel mount compass nearby.
I installed it in the panel, did an approximate compass swing using our local taxiway
centerlines as a reference for the cardinal pointsclose enough for our
purposes as magnetic deviation is minimal here. The figure shows good agreement
in cruise between EFIS and panel mount compass. No doubt a more rigorous compass
swing would improve things further.
Don sent me his findings.
I have looked into the magnetized D100. As you noted, it is the LCD that is the
source. More specifically the thin stainless frame around the LCD. Early version
LCD's (like yours) apparently have a stainless alloy frame that can be
magnetized, later versions (bright screen models) have a better stainless alloy
and won't stick to a magnet. The replacement we sent has the later version.
The panel mounted compass reads the same whether the master switch and avionics
switches are on or off, and whether or not the engine is running. Carefully
following Bob's guidelines in the Aero-Electric Connection while building no doubt
helped!
It should go without saying that I couldnt be happier with Dynons support, the
performance of the replacement unit, and that Im confident the problem wont return.
Many thanks to Don for his follow up that led to a successful conclusion.
Chris Skelt
LNC2 at IWS.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=502758#502758
Attachments:
http://forums.matronics.com//files/reman_efis_works_260.png
Message 10
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| Subject: | Re: Melted battery contractor ground wire |
That's always a possibility, I suppose. Maybe Bob postmortem will shed some light
on your supposition.
Thanks for supposing a new idea thread.
--------
Frank McDonald
Kitfox S7 - sold
RV7 in progress
Acworth, GA
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=502760#502760
Message 11
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| Subject: | Re: Melted battery contractor ground wire |
At 12:59 PM 7/8/2021, you wrote:
>
>I think that jluckey has solved the problem. Reverse battery
>polarity explains the melted wire and the blown fuse. Luckily the
>EFIS was not damaged.
>I predict that Bob N will not find anything wrong with the
>contactor. An over voltage event is extremely unlikely without an
>alternator running.
>It is pretty easy to reverse battery voltage when using jumper
>cables. One has a 50-50 chance of getting it wrong.
agreed. in fact, the spike suppression diode
served to PROTECT against reversed polarity.
It would have prevented contactor closing by
shunting the applied voltage to near zero and
thus causing the wire to melt.
This suggests a reason for including a fuse
in the battery contactor control line . . .
it would prevent wire and fuse damage in
the reverse polarity event.
Perhaps a fusible link? 24AWG against a
20AWG control line? Perhaps a bit more
robust mechanically. But this should
be an exceedingly rare event.
If you've not yet mailed the contactor,
I suggest you re-install it and see what
happens.
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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