Today's Message Index:
----------------------
1. 08:47 AM - Grounds (Mickey Billings)
2. 09:58 AM - Re: Grounds (Matt Prather)
3. 12:14 PM - Re: Grounds (Robert L. Nuckolls, III)
4. 01:51 PM - un-subsrcibe (Berend Ages)
5. 06:05 PM - Re: AeroElectric-List Digest: 3 Msgs - 07/06/04 (Speedy11@aol.com)
6. 06:19 PM - Checking Voltage (BobsV35B@aol.com)
Message 1
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Rule breakdown below
pts rule name description
--> AeroElectric-List message posted by: "Mickey Billings" <mbilli@cox.net>
I am getting ready to begin the wiring on our RV7 and do not completely
understand grounds. As of this date I have heard of 3 types:
1. Airframe which I think I understand.
2. (and here is where the confusion comes in) Avionics ground....is this
isolated from the airframe?
3. Battery ground...is this different from the Airframe ground and the
Avionics ground?
I believe the Battery ground and Avionics ground are one in the same but not
sure. Can anyone clear up this subject for me.....Thanks!
Message 2
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--> AeroElectric-List message posted by: "Matt Prather" <mprather@spro.net>
The battery ground is the negative terminal on the battery (or some point
very
close to the battery). The avionics ground is the where the negative
leads from
all of the different avionics devices are connected together. The
airframe ground
is anywhere the conductive material of the airframe (aluminum, mostly; steel
sometimes) is used to conduct current from the negative terminal of a
component
to the battery. Airframe ground refers more to using the airframe as
conductor
than it does to a specific poin on the airplane.
It is best practice to have all devices to ground to 'single point' in the
system, preferably
at a point which has a very low resistance connection to the negative
terminal on
the battery. A 'single point' can be a single bolt, or a ground bus which
may have a
bunch of tab connectors on it. Doing so is provides increased chances for
a trouble
free system.
Regards,
Matt-
N34RD
> --> AeroElectric-List message posted by: "Mickey Billings"
> <mbilli@cox.net>
>
> I am getting ready to begin the wiring on our RV7 and do not completely
> understand grounds. As of this date I have heard of 3 types:
>
> 1. Airframe which I think I understand.
> 2. (and here is where the confusion comes in) Avionics ground....is this
> isolated from the airframe?
> 3. Battery ground...is this different from the Airframe ground and the
> Avionics ground?
>
> I believe the Battery ground and Avionics ground are one in the same but
> not sure. Can anyone clear up this subject for me.....Thanks!
>
>
Message 3
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--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 08:51 AM 7/9/2004 -0700, you wrote:
>--> AeroElectric-List message posted by: "Mickey Billings" <mbilli@cox.net>
>
>I am getting ready to begin the wiring on our RV7 and do not completely
>understand grounds. As of this date I have heard of 3 types:
>
>1. Airframe which I think I understand.
>2. (and here is where the confusion comes in) Avionics ground....is this
>isolated from the airframe?
>3. Battery ground...is this different from the Airframe ground and the
>Avionics ground?
>
>I believe the Battery ground and Avionics ground are one in the same but not
>sure. Can anyone clear up this subject for me.....Thanks!
Is this purely an academic question or are you working on a particular
airplane? If a particular airplane, what kind and where do you want
to install your battery?
You might review the ground architecture drawings in Appendix Z to
the AeroElectric Connection which you can download from:
http://www.aeroelectric.com/articles/Rev10/z10.pdf
Check out figure Z-15 (two sheets).
In general, airframe grounds are made to any convenient metallic
structure. Recommend you limit real airframe grounding to remotely
mounted, non-victim/non-antagonist products like landing lights,
nav lights, pitot heaters, etc. Figure Z-15 will show a firewall
mounted, single point ground where all other things can come together
to avoid introduction of noises into potential victim systems
by potential antagonist systems. The single point firewall ground
eliminates potential for any and all "ground loops".
Power distribution diagrams published in appendix-z use the convention
G1 = crankcase ground, G2 = firewall ground (fwd), G3 = firewall ground
(aft side) and LCL for local airframe ground were applicable.
Bob . . .
-----------------------------------------
( Experience and common sense cannot be )
( replaced with policy and procedures. )
( R. L. Nuckolls III )
-----------------------------------------
Message 4
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1.2 MIME_HTML_MOSTLY BODY: Multipart message mostly text/html MIME
--> AeroElectric-List message posted by: "Berend Ages" <Berend42@cox.net>
Message 5
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| Subject: | Re: AeroElectric-List Digest: 3 Msgs - 07/06/04 |
--> AeroElectric-List message posted by: Speedy11@aol.com
In a message dated 7/7/2004 2:59:44 AM Eastern Daylight Time,
aeroelectric-list-digest@matronics.com writes:
> >I am considering adding a digital voltmeter to my panel. What is/are the
> >best place/s to hook up a voltmeter to in order to have the most useful
> >information? (Battery, Main Bus, etc.)
>
> I'd run it on the e-bus. This allows the voltmeter to be the "gas gage"
> for the battery under alternator-out operations. Under normal operations
> you'll read 0.6 to 1.0 volts below bus voltage. Closing the e-bus alternate
> feed switch during preflight will cause the reading to rise to battery
> voltage which will verify the alternate feed path and show that the diode
> is not shorted.
>
> Bob . . .
>
Bob,
How about reading from numerous locations with a selector switch? I'd like
to read volts and amps from several locations such as battery 1, battery 2,
alternator 1, alternator 2, main bus, ess bus, etc. Can I assume that is not
terrible difficult to do?
Stan Sutterfield
Message 6
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| Subject: | Checking Voltage |
--> AeroElectric-List message posted by: BobsV35B@aol.com
In a message dated 7/9/04 8:06:35 PM Central Daylight Time, Speedy11@aol.com
writes:
Bob,
How about reading from numerous locations with a selector switch? I'd like
to read volts and amps from several locations such as battery 1, battery 2,
alternator 1, alternator 2, main bus, ess bus, etc. Can I assume that is
not
terrible difficult to do?
Stan Sutterfield
Good Evening Stan,
This is a different Bob!
Unless you have a diode in the circuit that will drop the voltage, or some
other method of isolating the system to be checked from the rest of the
system, it should read the same everywhere.
I suppose there could be some trouble shooting capability by using pick ups
at various points around the system. However, as long as the wiring is
properly done and in good condition, all voltages will read the same.
Happy Skies,
Old Bob
AKA
Bob Siegfried
Ancient Aviator
Stearman N3977A
Brookeridge Airpark LL22
Downers Grove, IL 60516
630 985-8502
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