Today's Message Index:
----------------------
1. 07:39 AM - Re: Can I ground starter switch at panel? (Robert L. Nuckolls, III)
2. 07:44 AM - Re: E-Bus Off/On Indicator Light (gordonrsmith921@yahoo.com)
3. 08:00 AM - Re: Re: E-Bus Off/On Indicator Light (Robert L. Nuckolls, III)
4. 08:53 AM - Re: E-Bus Off/On Indicator Light (gordonrsmith921@yahoo.com)
5. 08:53 AM - intermittent intercom (Erich_Weaver@urscorp.com)
6. 09:44 AM - Re: intermittent intercom (David & Elaine Lamphere)
7. 01:45 PM - Re: Re: E-Bus Off/On Indicator Light (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: Can I ground starter switch at panel? |
At 09:41 PM 7/27/2010, you wrote:
><rparigor@suffolk.lib.ny.us>
>
>Would it be acceptable to feed 12V to the coil of my Rotax 914
>starter relay and only run 1 wire back to my panel mounted starter
>switch (looking for ground)?
>
>I have power very close to starter relay, and ground very close to
>starter switch.
Sure. Engine cranking systems are intermittent
use, short duration, almost never used in flight.
As the most demanding system on the airplane with
respect to power, it's also the most disruptive
of the otherwise quiet and orderly world of
battery powered systems. We don't generally expect
everything on the airplane to operate unperturbed
during a cranking event. We DO expect a graceful
recovery to normal operations afterward.
So as a general rule, the simplest recipe for
wiring the starter system that functions as needed
is the elegant solution.
Bob . . .
Message 2
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| Subject: | Re: E-Bus Off/On Indicator Light |
Therefore I assume it is OK to tie the ground sides from the LED and the relay
coil together through a single pole switch.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=306554#306554
Message 3
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| Subject: | Re: E-Bus Off/On Indicator Light |
At 09:43 AM 7/28/2010, you wrote:
><gordonrsmith921@yahoo.com>
>
>Therefore I assume it is OK to tie the ground sides from the LED and
>the relay coil together through a single pole switch.
Sure . . . as long as multiple loads (coil and LED)
that share ground through switch also share the same
source of power.
Bob . . .
Message 4
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| Subject: | Re: E-Bus Off/On Indicator Light |
So if the power source for the LED came directly from a tap on the e-bus itself
as you suggested as an alternate, in that case a double pole switch would be
required?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=306565#306565
Message 5
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| Subject: | intermittent intercom |
Feeling dumb about this question, but what the heck. My SL-40 radio is
wired to a PS Engineering PM1000 II intercom. Everything initially wor
ked
well, but the intercom function is now intermittent from the pilots
microphone side only. Transmit and reception are still fine. I cleane
d
the headphone plugs and corresponding socket contacts with no change.
I
have also made an initial inquiry with PS Engineering, who indicated th
at
the intercom circuit was dead simple and the unit itself was very unlik
ely
to be the problem. However, I have now realized that I often can
temporarily fix the problem by turning the intercom power off, then bac
k on
once or twice. Doesnt that in itself indicate that the problem is inde
ed
internal to the intercom? Given those symptoms, is there really anythi
ng
else to check before sending the unit back to the manufacturer?
thanks
erich
Message 6
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| Subject: | Re: intermittent intercom |
Erich,
I have that very same intercom installed in my Wittman Tailwind -
connected to a KX125. While they (PS1000II) are a little more expensive
than other brands, they are really good quality and work really well -
even in a noisy cockpit. One thing I found out debugging my installation
is the need to keep the jacks isolated from the aircraft's ground. It's
really picky about that. You might verify those mike, headset sockets
are not contacting ground (and any socket contacts that could be
shorting out to each other or ground). Also check the aux mike and
headset sockets (that you can use when the intercom is removed).
Maybe you have an intermittent short to ground somewhere in your
installation.
I have to agree that it is doubtful the intercom unit is faulty -
possible, but not likely.
Hope you find the fix!
Dave L.
N365DL
----- Original Message -----
From: Erich_Weaver@urscorp.com
To: aeroelectric-list@matronics.com
Sent: Wednesday, July 28, 2010 11:52 AM
Subject: AeroElectric-List: intermittent intercom
Feeling dumb about this question, but what the heck. My SL-40 radio is
wired to a PS Engineering PM1000 II intercom. Everything initially
worked well, but the intercom function is now intermittent from the
pilots microphone side only. Transmit and reception are still fine. I
cleaned the headphone plugs and corresponding socket contacts with no
change. I have also made an initial inquiry with PS Engineering, who
indicated that the intercom circuit was dead simple and the unit itself
was very unlikely to be the problem. However, I have now realized that I
often can temporarily fix the problem by turning the intercom power off,
then back on once or twice. Doesnt that in itself indicate that the
problem is indeed internal to the intercom? Given those symptoms, is
there really anything else to check before sending the unit back to the
manufacturer?
thanks
erich
Message 7
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| Subject: | Re: E-Bus Off/On Indicator Light |
At 10:51 AM 7/28/2010, you wrote:
><gordonrsmith921@yahoo.com>
>
>So if the power source for the LED came directly from a tap on the
>e-bus itself as you suggested as an alternate, in that case a double
>pole switch would be required?
Not necessarily. But it does drive a requirement
to evaluate unintended consequences (sneak path)
for flow of current should one of the separate
sources go to zero.
What's the design goal for this light?
Bob . . .
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