Today's Message Index:
----------------------
1. 01:36 AM - Re: Anti-corrosive paste (D L Josephson)
2. 07:39 AM - Re: AeroElectric-List Digest: 10 Msgs - 05/18/12 (Dennis Johnson)
3. 02:02 PM - AEC9001 Schottky diode in Z-13/8 (MikeDunlop)
4. 02:43 PM - Re: AEC9001 Schottky diode in Z-13/8 (John MacCallum)
5. 02:57 PM - Re: AEC9001 Schottky diode in Z-13/8 (Henador Titzoff)
6. 03:20 PM - Re: AEC9001 Schottky diode in Z-13/8 (MikeDunlop)
7. 03:36 PM - Re: AEC9001 Schottky diode in Z-13/8 (John Morgensen)
Message 1
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| Subject: | Re: Anti-corrosive paste |
As Bob mentioned, any grease will do for a while to keep moisture out,
which (along with lubricating the joint to reduce friction so the parts
conform when being squeezed together) is what you want. I think
par-al-ketone would work too but don't have any experience with it.
Penetrox is a little different, it contains 15% zinc dust in a castor
oil base, not zinc chromate as I had thought or zinc oxide as others had
assumed. It is intended not only to keep some moisture out but fill in
some of the gaps with a conductive medium. If you can keep it all in one
place, fine, but I don't think I want bits of
zinc-dust-containing-grease wandering around the airplane. I mentioned
No-Ox-Id because I know it works, and it stays where you put it. You
want a metal-to-metal contact, not through some intermediary metal
powder if you can avoid it.
--
David
Message 2
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| Subject: | Re: AeroElectric-List Digest: 10 Msgs - 05/18/12 |
I also have discovered the powerful anti-corrosion properties of No-Ox-Id "A
Special." I live away from the electric grid and depend on thousands of
pounds of lead acid batteries for power when the sun isn't shining. When I
bought my first set of batteries, the vendor included a quart can of
No-Ox-Id "A Special." I spread it on all the bare metal connectors around
the batteries, using a cheap flux brush. After close to 20 years, the
copper coated with it is still almost bright. The places I missed rapidly
tarnished and started corroding from the fumes given off when charging
batteries.
Of course, that's a pretty harsh environment. No-Ox-Id "A Special" works,
but I'm not sure it's needed on our airplanes. I didn't use it when
building my airplane.
Dennis
Message 3
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| Subject: | AEC9001 Schottky diode in Z-13/8 |
I'm half way through a new installation of Z-13/8 and have just installed the AEC9001
Schottky diode as per diagram. On testing the installation at this point
with NO electrical devices connected I'm getting the following voltage reading
from the bus terminals:
DC PWR - Off
E-Bus - Off
Main Bat Bus - 12v
Main Pwr Bus - 0v
E-bus - 0v
DC PWR - On
E-Bus - Off
Main Bat Bus - 12v
Main Pwr Bus - 12v
E-bus - 12v
DC PWR - On
E-Bus - On
Main Bat Bus - 12v
Main Pwr Bus - 12v
E-bus - 12v
DC PWR - Off
E-Bus - On
Main Bat Bus - 12v
Main Pwr Bus - 8v
E-bus - 12v
Question: Why am I getting 8v on Main Pwr Bus on the last test?
The AEC90001 Schottky Diode is new from AeroElectric and has been installed exactly
as per instructions.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=373361#373361
Message 4
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| Subject: | AEC9001 Schottky diode in Z-13/8 |
Hi Mike,
It's likely that the Meter you are using has a high Impedance and therefore
you can see a Voltage across the diode
When it's reverse Biased. If the Diode is working correctly it will not let
any current more than few Micro amps flow in the reverse
Direction. Try Using a Using a Diode Checker without applying a voltage to
the Diode. Alternatively Turn the E-Buss on and then
Apply a load to the Main Buss (light Bulb) and see what Voltage you read
then on the Main Buss.
Cheers
John MacCallum
VH-DUU
Rv 10 41016
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
MikeDunlop
Sent: Sunday, 20 May 2012 6:59 AM
Subject: AeroElectric-List: AEC9001 Schottky diode in Z-13/8
I'm half way through a new installation of Z-13/8 and have just installed
the AEC9001 Schottky diode as per diagram. On testing the installation at
this point with NO electrical devices connected I'm getting the following
voltage reading from the bus terminals:
DC PWR - Off
E-Bus - Off
Main Bat Bus - 12v
Main Pwr Bus - 0v
E-bus - 0v
DC PWR - On
E-Bus - Off
Main Bat Bus - 12v
Main Pwr Bus - 12v
E-bus - 12v
DC PWR - On
E-Bus - On
Main Bat Bus - 12v
Main Pwr Bus - 12v
E-bus - 12v
DC PWR - Off
E-Bus - On
Main Bat Bus - 12v
Main Pwr Bus - 8v
E-bus - 12v
Question: Why am I getting 8v on Main Pwr Bus on the last test?
The AEC90001 Schottky Diode is new from AeroElectric and has been installed
exactly as per instructions.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=373361#373361
Message 5
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| Subject: | Re: AEC9001 Schottky diode in Z-13/8 |
Mike,=0A=0AThe 8V is due to leakage current through the reverse biased Scho
ttky diode.=0A=0ALet's assume that your voltmeter has an internal resistanc
e of 10 MOhms, which is a fairly high load resistance intended to not affec
t normal measurements. -However, in this case, it is forming a two resist
or voltage divider network with the high resistance of the reverse biased d
iode. -Assuming your voltmeter is indeed 10 MOhms, you can determine what
the reverse bias resistnace is by doing the math:=0A- - -1. You know
that the voltage across the 10 MOhms of your voltmeter is 8V; therefore, t
he current through it is E/R = 8/10M = 0.8 uA=0A- - -2. This curr
ent is a series current through both the Schottky diode and the voltmeter
=0A- - -3. Since the diode is dropping 4V, its reverse biased resista
nce is E/I = 4V/0.8 uA = 5 MOhms=0A=0AIt's as simple as that. -The to
tal resistance is 15 MOhms, and the diode's resistance is 5 MOhms; therefor
e, it drops 1/3 of the voltage. -If you really want to prove what I said,
get yourself another meter that has a much higher internal resistance (x10
) and see what voltage you measure. -It will go toward 12V.=0A=0AAnother
way to prove this is to do just the opposite. -Put a real world load on t
he E-bus. -Its relatively low internal resistance will cause most or all
of the voltage to appear across the diode; therefore, the E-bus will very c
lose to 0V.=0A=0AHenador Titzoff=0A=0A=0A=0A_______________________________
_=0A From: MikeDunlop <mdunlop001@aol.com>=0ATo: aeroelectric-list@matronic
s.com =0ASent: Saturday, May 19, 2012 4:58 PM=0ASubject: AeroElectric-List:
AEC9001 Schottky diode in Z-13/8=0A =0A--> AeroElectric-List message poste
d by: "MikeDunlop" <mdunlop001@aol.com>=0A=0AI'm half way through a new ins
tallation of Z-13/8 and have just installed the AEC9001 Schottky diode as p
er diagram.- On testing the installation at this point with NO electrical
devices connected I'm getting the following voltage reading from the bus t
erminals:=0A=0ADC PWR- - - - Off=0AE-Bus- - - - - Off=0AMain
Bat Bus - 12v=0AMain Pwr Bus -- 0v=0AE-bus- - - - -- 0v=0A=0AD
C PWR- - - - On=0AE-Bus- - - - - Off=0AMain Bat Bus - 12v=0A
Main Pwr Bus - 12v=0AE-bus- - - - - 12v=0A=0ADC PWR- - - - O
n=0AE-Bus- - - - - On=0AMain Bat Bus - 12v=0AMain Pwr Bus - 12v=0AE
-bus- - - - - 12v=0A=0ADC PWR- - - - Off=0AE-Bus- - -
- - On=0AMain Bat Bus - 12v=0AMain Pwr Bus -- 8v=0AE-bus- - - -
- 12v=0A=0A=0AQuestion: Why am I getting 8v on Main Pwr Bus on the last te
st?=0A=0AThe AEC90001 Schottky Diode is new from AeroElectric and has been
installed exactly as per instructions.=0A=0A=0A=0A=0ARead this topic online
here:=0A=0Ahttp://forums.matronics.com/viewtopic.php?p=373361#373361=0A
=
Message 6
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| Subject: | Re: AEC9001 Schottky diode in Z-13/8 |
Many thanks for the quick replies. I will check as per your suggestions and also
make sure my test equipment and knowledge of electrics are suitable for the
job at hand. I'm sure that throughout this installation, both are going to
be needed.
MikeD (U.K.)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=373366#373366
Message 7
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| Subject: | Re: AEC9001 Schottky diode in Z-13/8 |
Your battery should be putting out more than 12 volts. On my
installation, I see about .2 to .3 volt difference between the main
power switch and the alternate feed switch due to the draw of the
contactor. In other words, if you see 12v on the battery bus and 12v on
the power bus then I would suspect your voltmeter is not accurate.
john
On 5/19/2012 1:58 PM, MikeDunlop wrote:
> --> AeroElectric-List message posted by: "MikeDunlop"<mdunlop001@aol.com>
>
> I'm half way through a new installation of Z-13/8 and have just installed the
AEC9001 Schottky diode as per diagram. On testing the installation at this point
with NO electrical devices connected I'm getting the following voltage reading
from the bus terminals:
>
> DC PWR - Off
> E-Bus - Off
> Main Bat Bus - 12v
> Main Pwr Bus - 0v
> E-bus - 0v
>
> DC PWR - On
> E-Bus - Off
> Main Bat Bus - 12v
> Main Pwr Bus - 12v
> E-bus - 12v
>
> DC PWR - On
> E-Bus - On
> Main Bat Bus - 12v
> Main Pwr Bus - 12v
> E-bus - 12v
>
> DC PWR - Off
> E-Bus - On
> Main Bat Bus - 12v
> Main Pwr Bus - 8v
> E-bus - 12v
>
>
> Question: Why am I getting 8v on Main Pwr Bus on the last test?
>
> The AEC90001 Schottky Diode is new from AeroElectric and has been installed exactly
as per instructions.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=373361#373361
>
>
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