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kearney(at)shaw.ca Guest
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Posted: Mon May 19, 2008 7:06 pm Post subject: Contactor Locations |
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Hi
I am trying to plan my RV10 electrical system and have a question for the electrical mavens. That is, how far from avionics should battery contactors be? I am looking at mounting my batteries in the sub panel area and would like to co–locate the contactors in the same area. Access is not an issue but I am concerned about possible interference with the avionics. I may end up locating the starter contactor on the same area as well. Would this be a problem?
Cheers
Les Kearney
[quote][b]
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nuckolls.bob(at)cox.net Guest
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Posted: Tue May 20, 2008 5:49 am Post subject: Contactor Locations |
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At 09:03 PM 5/19/2008 -0600, you wrote:
Quote: | Hi
I am trying to plan my RV10 electrical system and have a question for the
electrical mavens. That is, how far from avionics should battery
contactors be? I am looking at mounting my batteries in the sub panel area
and would like to co locate the contactors in the same area. Access is not
an issue but I am concerned about possible interference with the avionics.
I may end up locating the starter contactor on the same area as well.
Would this be a problem?
Cheers
Les Kearney
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Contactors are not high level antagonists to other
components of the system. You mount contactors where
it makes the most sense for their function. Battery
contactors close to batteries, starter contactors
close to starters, ect. In some architectures, they
can be clustered together.
In any case, there are no characteristics of a
contactor that makes them a threat to anything
other than the switch that controls them. See:
http://www.aeroelectric.com/articles/spikecatcher.pdf
http://www.aeroelectric.com/articles/spike.pdf
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
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kearney(at)shaw.ca Guest
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Posted: Tue May 20, 2008 3:48 pm Post subject: Contactor Locations |
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Bob
Thanks for the help. I read in the Aeroelectric Guide that the contactor
locations was not a big issue but wasn't sure how much flexibility I really
had.
A quick follow-up question: Will the electromagnets in the contactors be a
problem for any avionics. My Magnometers will be in the tail so that is not
a concern.
Cheers
Les
--
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nuckolls.bob(at)cox.net Guest
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Posted: Tue May 20, 2008 4:40 pm Post subject: Contactor Locations |
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At 05:43 PM 5/20/2008 -0600, you wrote:
Quote: |
Bob
Thanks for the help. I read in the Aeroelectric Guide that the contactor
locations was not a big issue but wasn't sure how much flexibility I really
had.
A quick follow-up question: Will the electromagnets in the contactors be a
problem for any avionics. My Magnometers will be in the tail so that is not
a concern.
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Magnetometers ARE a potential victim of stray magnetic
leakage from contactors but as a rule, if your magnetometer
is at least 3' away from a potential antagonist, you're
on solid ground. Another potential worry is stray field
from the SD-20 alternator. We had problems with interference
for a whisky compass mounted on the glare shield of
the A36 . . . but the problem went away when the compass
was moved upward about 10" onto the windshield.
The effects of a potential antagonist on a magnetic
navigation instrument is greatly attenuated by distance
. . . a few more inches separation can make a lot of
difference.
On heavy iron birds, we usually mount magnetometers
out in a wing just ahead of ailerons and use non-magnetic
stainless fasteners in the immediate vicinity.
Bob . . .
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Mark Phillips in TN
Joined: 10 Jan 2006 Posts: 431 Location: Columbia, TN
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