Today's Message Index:
----------------------
1. 05:41 AM - Re: Plane Power alternator $$$$ (Coastflyer)
2. 11:04 AM - Re: Filling All the Holes in a DB Connector (Jeff Luckey)
3. 11:34 AM - Re: Re: Plane Power alternator $$$$ (skywagon185guy)
4. 03:32 PM - Tailwind Electrical System Drawing and Power Analysis (Gerry van Dyk)
5. 08:47 PM - Re: Re: Plane Power alternator $$$$ (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: Plane Power alternator $$$$ |
I ordered a new battery. I figured its time to replace it anyway and maybe if battery
internal resistance is the cause of the fluctuations Im seeing, that will
clear it up.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=512965#512965
Message 2
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| Subject: | Re: Filling All the Holes in a DB Connector |
Closing the loop...
I spoke w/ Garmin Tech Support and the guy who teaches the Experimental Wir
ing class at the Aircraft Electronics Assn and I stand corrected.=C2- Som
ehow, I got it in my head that you should populate all the pins in a DB con
nector, even if there is no wire attached to it.=C2- Don't know where I g
ot this but it is INCORRECT. - I was mistaken (not the first time;)
I don't think that there is anything wrong with doing this, but it is not a
recommended procedure (as I had originally thought).
It is interesting to note however, that pre-wired harnesses from Spruce com
e with all the pins populated (even the ones without a wire attached).=C2
- This is probably so that you can customize the pre-fabbed harness and a
dd wires specific to your installation.=C2- But it would seem better if S
pruce just populated the ones required for their harness and sent you a bag
of spare pins.=C2- I wonder how many people bother to remove the un-used
pins?
Happy New Year!
-Jeff
On Tuesday, November 21, 2023 at 04:12:43 PM PST, Matthew S. Whiting <m
.whiting@frontier.com> wrote:
Where does Garmin recommend that? =C2-I don=99t recall seeing that
in the G3X installation manual. =C2-I=99ve been an EE for nearly 4
0 years and don=99t recall this being a common practice. =C2-Most w
eather resistant connectors have plugs available specifically for the holes
in the connectors that aren=99t loaded.
Matt
Sent from my iPad
On Nov 21, 2023, at 4:46=AFPM, Jeff Luckey <jluckey@pacbell.net> wrot
e:
=EF=BBListers,
Question about DB/D-Sub connectors eg: DB9, DB25, DB37, etc.
Garmin recommends, and it seems to be common practice, that all holes in a
given DB connector have a pin/socket installed, even when there is no wire
connected to that pin.=C2-=C2-
Why is that?
-Jeff
=C2-
Message 3
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| Subject: | Re: Plane Power alternator $$$$ |
Alternator fluctuations....
By any chance do you have flashing strobes or something like that type of
load..?
That will make your amp meter flicker....
On Thu, Dec 28, 2023 at 5:43=AFAM Coastflyer <jessejenks72@gmail.com>
wrote:
> jessejenks72@gmail.com>
>
> I ordered a new battery. I figured it=99s time to replace it anyway
and
> maybe if battery internal resistance is the cause of the fluctuations I
=99m
> seeing, that will clear it up.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=512965#512965
>
>
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>
>
Message 4
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| Subject: | Tailwind Electrical System Drawing and Power Analysis |
Hello again all
Well, I think I'm ready for a good critique on my proposed electrical
system for my Tailwind project. For the most part it's based on Z13/8,
we're using a Plane Power AL12-E160 primary alternator, and of course
the B&C SD-8 backup alternator. The E160 is internally regulated, and
also has an internal crowbar system and alt-out panel light output,
which I intend to use. The SD-8 has their older PMR1 regulator, so
we've got the external crowbar module and no voltage sensing. I've
drawn these items as shown on their respective install instructions call
for.
As I mentioned earlier, I intended to start the engine on the endurance
bus, and check the SD-8 operation during the startup procedure. I had
neglected to think about where the starter was going to get power from,
so the idea has forced an additional switch and relay (a rather robust
one at that) to run the main bus. The battery contactor would be closed
for startup, then the SD-8 operation checked and finally the main bus
would be brought up to begin normal operation.
I'm a little uneasy about this extra switching, as I know this group is
inclined toward fewer failure points, and with good reason. As I look
at the 'textbook' Z13/8 drawing, with my dual EFIS, IFR capable panel in
mind, it seems to me that a startup would bring the entire panel up with
the main bus, then with the engine running I'd have to close the E-bus
switch, open the battery contactor, dropping out half the instrument
panel. Then check the backup alternator operation, and finally reboot
the rest of the panel again. It just really feels rather clunky to me.
Bob, have I missed something with the original architecture concept? Is
there a way to check the backup alternator function while the main bus
is up and running? It would certainly help me simplify my system.
I'd appreciate if you good folks would give my drawing a good review.
Questions, comments and critiques are all welcome.
Thanks again
Gerry van Dyk
Tailwind C-GVDZ
Message 5
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| Subject: | Re: Plane Power alternator $$$$ |
At 07:40 AM 12/28/2023, you wrote:
<jessejenks72@gmail.com>
>
>I ordered a new battery. I figured it=99s time
>to replace it anyway and maybe if battery
>internal resistance is the cause of the
>fluctuations I=99m seeing, that will clear it up.
I'm sorry . . . the battery condition that
promotes hyper-active ammeter indications
is LOW internal resistance characteristic
of a battery in excellent condition. If
this is indeed root cause of your observed
condition, a new battery will only make
it worse.
That's only one of the possible causes.
As I mentioned in the former post, I
your airplane were in my shop, I have
the equipment necessary to deduce
the root cause but it's a pretty
detailed investigation. I was pretty
wordy in that missive. Short answer:
I don't think there are any operational
concerns that arise from your
observations.
Bob . . .
////
(o o)
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< Go ahead, make my day . . . >
< show me where I'm wrong. >
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