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blackoaks(at)gmail.com
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 Posted: Mon Mar 17, 2008 9:45 am Post subject: Z-19 with Z-30 and Z-31B |
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I connected my Piper style socket to a brass bus bar which will connect my two 12 v. batteries on the aircraft side of the contactors. I was doing this to keep the batteries isolated from each other unless both battery contactors were closed. This would allow charging either or both batteries or only powering aircraft systems from the ground power plug. If I understand correctly, that would not be a good idea because powering aircraft systems without a battery on line is a bad idea. Any pros or cons to this?
On Sun, Mar 16, 2008 at 7:00 PM, Robert L. Nuckolls, III <nuckolls.bob(at)cox.net (nuckolls.bob(at)cox.net)> wrote:
| Quote: | --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckolls.bob(at)cox.net (nuckolls.bob(at)cox.net)>
At 01:53 AM 3/16/2008 +0000, you wrote:
>--> AeroElectric-List message posted by: "Carlos Trigo"
><trigo(at)mail.telepac.pt (trigo(at)mail.telepac.pt)>
>
>Listers
>
>I installed a Piper-type male socket to my airplane, to have the possibility
>of a ground start in case of a low battery cranking difficulty.
>As recommended by this List experts, I connected the socket to the battery
>through a continuous duty contactor (aka Master Relay or Battery solenoid),
>the S701-1 from B&C, controlled by a SPST switch, which grounds the
>contactor when thrown to ON.
>
>Now what I want to do is to put a green enunciator light in my panel, which
>illuminates when that switch is ON and the contactor is closed to allow the
>ground start procedure, to remind me to switch it Off after finishing that
>procedure.
>
>I have tried some wiring of the warning light to the switch, but I cannot
>make it work properly. Can somebody please enlighten me how to wire it?
Carlos,
A couple of hours after I replied to this it occurred to me that
you probably were not incorporating a press-to-test light fixture
nor did you mention crowbar ov protection. I've updated the
schematics in the article to include "Ground Power Lite" without
OV protection and using a plain vanilla lamp fixture. See the
last page of:
http://www.aeroelectric.com/articles/grndpwr.pdf
Is this more like what you needed?
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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--
John McMahon
Lancair Super ES, S/N 170, N9637M (Reserved) [quote][b]
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nuckolls.bob(at)cox.net
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| Posted: Mon Mar 17, 2008 10:15 am Post subject: Z-19 with Z-30 and Z-31B |
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At 10:39 AM 3/17/2008 -0700, you wrote:
| Quote: |
I connected my Piper style socket to a brass bus bar which will connect
my two 12 v. batteries on the aircraft side of the contactors. I was
doing this to keep the batteries isolated from each other unless both
battery contactors were closed. This would allow charging either or both
batteries or only powering aircraft systems from the ground power plug.
If I understand correctly, that would not be a good idea because powering
aircraft systems without a battery on line is a bad idea. Any pros or
cons to this?
|
There's been much discussion on this over the years. Generally
speaking in the TC world, ground power is not considered a battery
charging tool. In fact, it's not recommended that the pilot use
ground power to get an engine started with a dead battery . . .
ground power is to ASSIST the battery for difficult starts, i.e.
cold weather or long cranking cycles for turbine engines, and
ground maintenance.
You can use what ever philosophy you're comfortable with.
My reason for the architecture shown is that first, a pilot
has absolute control over incoming power. Second, ground
power can be applied, turned on and verified for polarity
and proper voltage before the battery master is closed
thus connecting the ground power/battery combination to
the aircraft's systems.
For your situation, being able to charge only one of
the two batteries should not be a problem very often
during your ownership of the airplane. On the other hand,
when that kid standing out in the cold wind, back to
you is flipping switches on that WWII surplus gasoline
driven generator, it would be nice if YOU were the
final arbiter of when ground power is actually applied
to your airplane's electrical system.
Bob . . .
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