Today's Message Index:
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1. 03:20 AM - Buy New Apple iPhone 12 5G 128GB Original Unlocked $729 (jeiaery)
2. 05:51 AM - Re: Melted battery contractor ground wire (frank3)
3. 07:17 AM - Re: Melted battery contractor ground wire (user9253)
4. 10:40 AM - Re: Melted battery contractor ground wire (frank3)
5. 11:21 AM - Re: Melted battery contractor ground wire (frank3)
6. 01:16 PM - Re: Re: Melted battery contractor ground wire (Jeff Luckey)
7. 04:58 PM - Re: Re: Melted battery contractor ground wire (Robert L. Nuckolls, III)
8. 05:02 PM - Re: Re: Melted battery contractor ground wire (Robert L. Nuckolls, III)
9. 05:25 PM - Re: Melted battery contractor ground wire (frank3)
10. 05:49 PM - Re: Re: Melted battery contractor ground wire (Jeff Luckey)
11. 07:09 PM - Re: Melted battery contractor ground wire (n1dw)
12. 07:56 PM - Buy New Apple iPhone 12 5G 256GB Original Unlocked $829 (jeiaery)
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| Subject: | Buy New Apple iPhone 12 5G 128GB Original Unlocked |
$729
The Price is Canadian dollar. Visit Our Website www.esellibuy.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=502718#502718
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| Subject: | Re: Melted battery contractor ground wire |
I haven't made any changes to the battery contactor recently.
--------
Frank McDonald
Kitfox S7 - sold
RV7 in progress
Acworth, GA
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http://forums.matronics.com/viewtopic.php?p=502719#502719
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| Subject: | Re: Melted battery contractor ground wire |
Remove the wire from the small terminal of the battery contactor.
Measure the resistance between that small contactor terminal and the large contactor
terminal that connects to battery positive.
I expect it to be about 20 ohms. If less than 5 ohms, the contactor coil is shorted.
--------
Joe Gores
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| Subject: | Re: Melted battery contractor ground wire |
Thanks Joe. Did that this AM. No resistance at all. Shorted contactor as you
suggest.
The burnt ground wire was in a loose bundle--run together but haven't tied them
together. I assume there's possible damage to other wires in the bundle? If
there's no damage to the insulation of the other wires then they're good to go?
--------
Frank McDonald
Kitfox S7 - sold
RV7 in progress
Acworth, GA
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http://forums.matronics.com/viewtopic.php?p=502722#502722
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| Subject: | Re: Melted battery contractor ground wire |
This experience makes me wonder why no circuit protection for the contactor activator
switch circuit in any of the architectures.
Maybe it's because a short in the contactor is unlikely, as Joe says, but isn't
that the assumption behind all circuits that do have circuit protection built
in?
--------
Frank McDonald
Kitfox S7 - sold
RV7 in progress
Acworth, GA
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http://forums.matronics.com/viewtopic.php?p=502723#502723
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| Subject: | Re: Melted battery contractor ground wire |
Hello Frank,
You are asking good questions.
What typically happens is the coil burns up and causes an open circuit, but
in your case it appears to have failed closed.
It will be interesting to conduct a post-mortem on it to determine how it c
reated such a hard fault.
Questions:
1. Can you post a picture of the master solenoid/contactor?2. What size wir
e runs from the solenoid to the master switch?
-Jeff
On Tuesday, July 6, 2021, 11:27:49 AM PDT, frank3 <frank3phyl@comcast.n
et> wrote:
This experience makes me wonder why no circuit protection for the contactor
activator switch circuit in any of the architectures.
Maybe it's because a short in the contactor is unlikely, as Joe says, but i
sn't that the assumption behind all circuits that do have circuit protectio
n built in?
--------
Frank McDonald
Kitfox S7 - sold
RV7 in progress
Acworth, GA
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=502723#502723
-
S -
WIKI -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
Message 7
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| Subject: | Re: Melted battery contractor ground wire |
At 03:15 PM 7/6/2021, you wrote:
>Hello Frank,
>
>
>You are asking good questions.
>
>What typically happens is the coil burns up and causes an open
>circuit, but in your case it appears to have failed closed.
>
>It will be interesting to conduct a post-mortem on it to determine
>how it created such a hard fault.
We've inspected a few failures here over the
years but a hard fault across the coil is
a new one.
Here's an exemplar 'open' coil
https://tinyurl.com/yzcx4q2u
If you have no other plans for the failed
part, I'd like to have it.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
Message 8
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| Subject: | Re: Melted battery contractor ground wire |
At 01:20 PM 7/6/2021, you wrote:
>
>This experience makes me wonder why no circuit protection for the
>contactor activator switch circuit in any of the architectures.
>
>Maybe it's because a short in the contactor is unlikely, as Joe
>says, but isn't that the assumption behind all circuits that do have
>circuit protection built in?
The vast majority of failures in wires
is a lost of continuity. Broken wire,
loose terminal, etc. The battery contactor
control wire is generally never at-risk
for fault to ground on the run between
contactor and master switch . . . the master
contactor simply becomes 'stuck on'.
The fault you've experienced is exceedingly
rare . . . the first one I've heard of.
It would be interesting to identify and
document the failure mode.
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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| Subject: | Re: Melted battery contractor ground wire |
Jeff
What pic would be most revealing for you? Installed on the firewall? Removed
on the bench? Other?
--------
Frank McDonald
Kitfox S7 - sold
RV7 in progress
Acworth, GA
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=502729#502729
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| Subject: | Re: Melted battery contractor ground wire |
I'd like to see it as installed, for starters.
-Jeff
On Tuesday, July 6, 2021, 5:32:06 PM PDT, frank3 <frank3phyl@comcast.ne
t> wrote:
Jeff
What pic would be most revealing for you?=C2- Installed on the firewall?
=C2- Removed on the bench?=C2- Other?
--------
Frank McDonald
Kitfox S7 - sold
RV7 in progress
Acworth, GA
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=502729#502729
-
S -
WIKI -
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=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
Message 11
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| Subject: | Melted battery contractor ground wire |
Frank,
The only way you are going to melt that wire is likely with a direct short
between positive and negative battery voltages. Most likely candidates for
that occurrence is a mis-wired switch or contactor.
I would disconnect the wire from the switch where it attaches to the 'field
of tabs' and rewire from the switch to the contactor. Do a continuity test
from the contactor terminal to the now disconnected connector at the field
of tabs. In the switch 'ON' position, you should have very little
resistance, and high resistance in the 'OFF' position. If both of those are
TRUE, then that wiring should be OK. If they are not both TRUE, then you
need to examine the wiring to the switch more closely.
Another possibility is that you have the positive and negative terminals of
the contactor switched with your wiring arrangement. That is the area I
would examine next after all the foregoing. If neither of these is the
problem, could it be a bad contactor?
Doug Windhorn
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
<owner-aeroelectric-list-server@matronics.com> On Behalf Of frank3
Sent: Monday, July 5, 2021 1:49 PM
Subject: AeroElectric-List: Melted battery contractor ground wire
--> <frank3phyl@comcast.net>
I flipped the battery switch that activates the contractor this AM and
melted the ground wire.
I'm deep in the process of wiring my RV7 (most of the wiring completed),
using a legacy schematic with EBUS architecture. Wiring to the battery
contractor is standard--wire from contactor to switch (2-10) with ground to
field of tabs at firewall.
I have used a lawn tractor battery numerous times to energize the system
when testing components as they're installed. All has worked well until
this AM.
I'd appreciate input to help me resolve what the issue might be.
Thanks much in advance.
--------
Frank McDonald
Kitfox S7
912S, Sensenich Composite 3 Blade
Acworth, GA
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http://forums.matronics.com/viewtopic.php?p=502714#502714
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| Subject: | Buy New Apple iPhone 12 5G 256GB Original Unlocked |
$829
The Price is Canadian dollar. Visit Our Website http://www.esellibuy.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=502732#502732
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