Today's Message Index:
----------------------
1. 12:42 AM - Re: need BNC jumper for Narco AT-150 tray (Scott Klemptner)
2. 05:38 AM - Re: Re: need BNC jumper for Narco AT-150 tray (Robert L. Nuckolls, III)
3. 01:23 PM - E-bus and Alternator (Jan de Jong)
4. 02:35 PM - Toggle switch keyway convention: up vs. down (roee)
5. 05:05 PM - Re: Toggle switch keyway convention: up vs. down (tim2542@sbcglobal.net)
6. 07:08 PM - Re: E-bus and Alternator (Robert L. Nuckolls, III)
7. 08:02 PM - Re: Toggle switch keyway convention: up vs. down (mmayfield)
Message 1
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| Subject: | Re: need BNC jumper for Narco AT-150 tray |
i have been using these, DBA-600, NO SOLDERING REQUIRED!!!!!
i buy them from EDMO, but this link was faster to get
http://almenaaerostore.com/index.php?main_page=product_info&products_id=169&zenid=3e5f681bed56d4a9c4404506f48f1db1
Scott A Klemptner
bmwr606 on Yahoo IM
The difference between genius and stupidity is that genius has its limits-
Anonymous
________________________________
Time: 01:10:08 PM PST US
Subject: AeroElectric-List: need BNC jumper for Narco AT-150 tray
From: "Tucsonchris" <chris@chrisgall.com>
My BNC jumper that fits into the back of my Narco AT-150 tray has broken. I'm
not
sure what style of connector this is called, or I might google a search for
it. It is clearly not repairable. Does anyone know where to find a replacement?
Thanks.
--------
Chris G.
Tucson, Arizona
Marana Regional Airport
Kitfox SS
912s
Read this topic online here:
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| Subject: | Re: need BNC jumper for Narco AT-150 tray |
At 03:35 AM 2/28/2011, you wrote:
>i have been using these, DBA-600, NO SOLDERING REQUIRED!!!!!
Cool find! Thanks for the heads-up. I've
mirrored the data at:
http://aeroelectric.com/Pictures/Connectors/Coax/DBA-600.jpg
http://aeroelectric.com/Mfgr_Data/Connectors/Deklin/DBA-600_Brochure.pdf
Bob . . .
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| Subject: | E-bus and Alternator |
Studying the Z-figures I find (I believe) that in the case of a failed
contactor it is possible to charge the battery through the E-bus diode
and Alt Feed switch - if one is so careless as to close that switch
while leaving the Alternator on. Generally worse and more likely: to
switch the Alternator back on after a stretch of battery-only operation
without opening the Alt Feed switch first. Diode and switch are not made
for that.
I think it is important to reserve the closing of the Alt Feed switch
for the occasion where the Alternator has failed and is kept off for the
duration (I wonder if an interlock might be devised that prohibits
having both Alt Feed on and Alternator on?).
Jan de Jong
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| Subject: | Toggle switch keyway convention: up vs. down |
This is a question for Bob Nuckolls as author of the AeroElectric Connection:
In the chapter on switches, it is stated that "for most applications, switches
are mounted with bushing keyway oriented UP in the panel." (Page 11-16)
However, looking at various other sources, including several switch manufacturers'
datasheets as well as switch-related mil specs, it seems that the common convention
is actually to mount switches with the keyway oriented down.
And another small clue in support of the keyway down convention is the most basic
of all switches, the S700-1-2 described in the AeroElectric Connection itself.
The action is OFF on the keyway position and ON on the opposite position.
Common functional convention for on/off switches is ON-up / OFF-down (I don't
think that's in dispute, right?). So to conform to this convention in switching
a load using a S700-1-2 switch, it would have to be oriented keyway down.
So I'd like to understand the apparent discrepancy in conventions, keyway up vs.
down. Now, I understand that either way it's just a matter of convention and
is otherwise pretty much arbitrary. But if there really is a reason that I'm
not aware of to favor keyway up, then, well, I'd like to be made aware of it
so I can make the most informed decision when choosing a convention for my panel.
Bob, are there such factors in favor of keyway up?
Thanks,
-Roee
Read this topic online here:
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| Subject: | Re: Toggle switch keyway convention: up vs. down |
I just ran into this myself after having my panel cut out on a CNC machine with
all the antirotation tabs cut into the top of the hole. Now I guess I'll have
to replace all my 1-2 switches.
Tim
Sent from my iPhone
On Feb 28, 2011, at 2:32 PM, "roee" <roee@kalinskyconsulting.com> wrote:
>
> This is a question for Bob Nuckolls as author of the AeroElectric Connection:
>
> In the chapter on switches, it is stated that "for most applications, switches
are mounted with bushing keyway oriented UP in the panel." (Page 11-16)
>
> However, looking at various other sources, including several switch manufacturers'
datasheets as well as switch-related mil specs, it seems that the common
convention is actually to mount switches with the keyway oriented down.
>
> And another small clue in support of the keyway down convention is the most basic
of all switches, the S700-1-2 described in the AeroElectric Connection itself.
The action is OFF on the keyway position and ON on the opposite position.
Common functional convention for on/off switches is ON-up / OFF-down (I don't
think that's in dispute, right?). So to conform to this convention in switching
a load using a S700-1-2 switch, it would have to be oriented keyway down.
>
> So I'd like to understand the apparent discrepancy in conventions, keyway up
vs. down. Now, I understand that either way it's just a matter of convention
and is otherwise pretty much arbitrary. But if there really is a reason that
I'm not aware of to favor keyway up, then, well, I'd like to be made aware of
it so I can make the most informed decision when choosing a convention for my
panel. Bob, are there such factors in favor of keyway up?
>
> Thanks,
> -Roee
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=332328#332328
>
>
>
>
>
>
>
>
>
>
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| Subject: | Re: E-bus and Alternator |
At 04:18 PM 2/28/2011, you wrote:
>
>Studying the Z-figures I find (I believe) that in the case of a
>failed contactor it is possible to charge the battery through the
>E-bus diode and Alt Feed switch - if one is so careless as to close
>that switch while leaving the Alternator on. Generally worse and
>more likely: to switch the Alternator back on after a stretch of
>battery-only operation without opening the Alt Feed switch first.
>Diode and switch are not made for that.
Correct . . .
>I think it is important to reserve the closing of the Alt Feed
>switch for the occasion where the Alternator has failed and is kept
>off for the duration
. . . yes
>(I wonder if an interlock might be devised that prohibits having
>both Alt Feed on and Alternator on?).
Hmmmm . . . sure. You could use a 2-pole switch
for the alternate feed path control and put one pole
in series with the alternator control.
A number of folks on the List have asked about flying
with the alternate feed closed all the time . . . which
offers no hazard as long battery contactor is closed
before and while the alternator is operating. As you've
noted, battery contactor failure would put this pathway
at-risk.
Contactor failure is a low order risk but obviously
not zero. The simplest action is to craft an alternator-
out check-list that goes to avoiding the undesired
configuration.
Your hypothesis raises another question. How does
one become aware of contactor failure in flight? The
AEC9011 offered a two channel low volts warning light
for both the main bus and any of the batteries. The
second light was intended to remind a pilot to close
an aux battery switch for a small battery after the
engine was started and the alternator came on line.
If the contactor did fail, the alternator may well
run happily self excited and things might go as
anticipated all the way to engine shut-down. Of course,
you'd know about the failure at the next time you
came out to fly. That's one of the reasons I like to
shut the alternator off before killing the engine
but leaving the battery on. This will get you a low
volts warning light if the contactor is good, a dark
panel if not.
Bob . . .
Message 7
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| Subject: | Re: Toggle switch keyway convention: up vs. down |
Interesting question, and from my own research it seems a bit like "horses for
courses" - the keyway may need to be up or down depending on your use of the switch.
Eg, I have a panel plan with the 2TL1-50 switch in it for a boost pump/prime
switch. The momentary action is for the prime, which will be in the "up"
position, which is also the keyway position. The "off" position is opposite keyway.
So the keyway must be orientated up.
On other switches I have planned like the 2TL1-10, the position of the keyway won't
matter. As long as the right terminals are connected, they'll work just as
intended. However on a 1TL1-2 or equivalent, the keyway will clearly have to
be orientated down.
I would take "keyway conventions" with a grain of salt!
--------
Mike
Sydney, Australia
Pitts Model 12 under construction.
"Get your facts first, and then you can distort them as much as you please."
Mark Twain. Writer.
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