Today's Message Index:
----------------------
1. 06:51 AM - Re: Contactors (Robert L. Nuckolls, III)
2. 06:51 AM - Re: Re: kitfox /rotax 912 wiring diagram (variation on Z-16) (Robert L. Nuckolls, III)
3. 07:09 AM - Re: Re: kitfox /rotax 912 wiring diagram (variation on Z-16) (Robert L. Nuckolls, III)
4. 01:01 PM - Two Audios wired to One PM-3000 input thru a 500ohm resistor each? (Yahoo hasbroucka)
5. 02:06 PM - Re: Two Audios wired to One PM-3000 input thru a 500ohm resistor each? (Robert L. Nuckolls, III)
6. 03:45 PM - Re: Flow indicator (BobsV35B@aol.com)
7. 04:21 PM - Baron Tach Problem (frank3)
8. 05:13 PM - Re: Flow indicator (Charlie England)
9. 05:21 PM - Re: Two Audios wired to One PM-3000 input thru a 500ohm resistor each? (Charlie England)
10. 05:31 PM - Re: Flow indicator (BobsV35B@aol.com)
11. 05:59 PM - Re: Flow indicator (Charlie England)
12. 06:05 PM - Re: Flow indicator (BobsV35B@aol.com)
Message 1
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>
>Yes the Faston tabs are 3/8" instead of the regular 1/4". Here's a
>pic I took yesterday but its not easy to see how the connections are
>made on the cube.
>Sacha
>
>
>Note that he appears to be using something (on the left) that looks
>to me like a battery contactor in lieu of a starter contactor. The
>master contactor is the red "384" series cube on the right.
I am not comfortable with the notion of tying
4AWG wires to these 70A plastic cube relays . . .
Consider the terminals on a 70-series contactors
. . . or any other "contactor". They are mechanically
robust.
Emacs!
The whole idea behind terminal posts on a contactor
is to provide rigidity . . . wiring induced bending
and torque moments do not move the terminal . . .
hence they do not affect contact alignment inside
the contactor.
Terminals on the plastic cube relays are simply
held in place by virtue of the housing molded
around them. I think if I were going to incorporate
one of the 70A cubes into a system, I would wire
with no greater than 6AWG and use welding cable
at that (soft and flexible).
The reasoning driving substitution of the plastic
cube as a battery relay seems to be rooted in
power consumption . . .
The 'savings' between a cube (180mA) and a
70-series (700mA) coil current is only about
1/2 amps.
Are you sure you NEED to save that 1/2A for
other tasks? If 1/2A has so much influence
on your load analysis, then perhaps you're
proposed sources/loads are not practical.
I suggest you consider finishing up the load
analysis task before you commit to incorporation
of an extra-ordinary substitution for a battery
contactor with a known service history.
Bob . . .
Message 2
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| Subject: | Re: kitfox /rotax 912 wiring diagram (variation |
on Z-16)
At 03:32 PM 11/30/2013, you wrote:
>
>
> > To reduce electrical noise from the fuel pump, the capacitor
> should be located at the fuel pump and connected to the positive
> and negative wires of the fuel pump. I assume that is what you
> have done in the winmail.dat file. Joe Gores
>
>Yes it is. But I thought that the capacitor in parallel with the
>fuel pump was to facilitate the starting of the pump not to reduce noise.
>
>Sacha
Have there been any reported instances of noise from
a fuel pump?
Bob . . .
Message 3
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| Subject: | Re: kitfox /rotax 912 wiring diagram (variation |
on Z-16)
At 09:30 PM 11/29/2013, you wrote:
>
>OK, you have the dynamo working now. I see no other major
>mistakes. I would not have all of those buttons on the control
>stick because I know that I would get them mixed up and push the
>wrong one. But that is a matter of personal preference. In the
>lower right hand corner of the drawing is a 22,000 microfarad
>capacitor that is connected between ground and the contactors. I do
>not think that capacitor is needed. It does not hurt anything, but
>is one more thing that could fail.
The large electrolytic capacitors common to
most PM/Rectifier-Regulator installations
is problematic. We know that these capacitors
have little benefit for smoothing ripple
voltage on the rectified output of the rectifier/
regulator.
There's no demonstrated benefit for reduction
of observable noise in headsets/radios.
The presence of this capacitor MIGHT be of
benefit when operating the system alternator-only
but I've not accomplished any testing to explore
or demonstrate this feature.
In any case, they've been installed on most if
not all PM alternator systems and certainly
don't hurt anything. But their benefits are
not yet qualified.
Bob . . .
Message 4
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| Subject: | Two Audios wired to One PM-3000 input thru a 500ohm |
resistor each?
Hi,
I am installing a PM-3000, 11931-A in my SeaRey Amphibian. This device
has
two Un-switched inputs, and I have three audio output warning devices. I
have gained some understanding from the archives that an isolation
amplifier
is needed to make this work properly, but the SeaRey factory and dealer
are
telling me that all I need to do is to connect my Gear Alert and my
Power
Buss alert audio wires to a 500ohm resistor each, and connect them to a
single un-switched audio input on the PM-3000. Both of these devices
have
adjustable gain. The remaining input connects to the SkyView audio out.
The instruction is qualified with the fact that this has been performed
satisfactorily on many of these aircraft. Yet what I learned from The
List,
and from AE Connection, leaves me skeptical.
I sent a note to PS Engineering over a week ago, no response yet.
Can anyone shed some light on how acceptable this is, or why and how I
should do something different?
I also am a little troubled by the SkyView instructions for multiple SV
Screens, that CLEARLY state; to electrically connect both left and right
stereo outputs together at each screen connector (creating a Mono
output),
PLUS to jumper across all screens. This is to ensure that regardless of
power to any screen, all audio warning will be heard. This is not only
clearly communicated, they provide an example making clear all 4 audio
outputs of a two screen system are twisted together and fed to one input
on
the Intercom. Any comments regarding this instruction?
Thanks,
Alan ,
HasbrouckA@yahoo.com
SeaRey Amphibian, Assembled and Painted. Working on VFR avionics and
wiring
(Dynon Skyview full suite). Top Priority is keep it light, and place
weight
forward!
Message 5
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| Subject: | Re: Two Audios wired to One PM-3000 input thru a |
500ohm resistor each?
At 03:00 PM 12/2/2013, you wrote:
Hi,
I am installing a PM-3000, 11931-A in my SeaRey Amphibian. This
device has two Un-switched inputs, and I have three audio output
warning devices. I have gained some understanding from the archives
that an isolation amplifier is needed to make this work properly, but
the SeaRey factory and dealer are telling me that all I need to do is
to connect my Gear Alert and my Power Buss alert audio wires to a
500ohm resistor each, and connect them to a single un-switched audio
input on the PM-3000. Both of these devices have adjustable gain. The
remaining input connects to the SkyView audio out.
The instruction is qualified with the fact that this has been
performed satisfactorily on many of these aircraft. Yet what I
learned from The List, and from AE Connection, leaves me skeptical.
I sent a note to PS Engineering over a week ago, no response yet.
The two-resistor-mixer technique will work. You
may find it useful/necessary to fiddle the
the resistor sizes to get the volume you want
from each tone. Increasing the size of the resistor
decreases volume. When trying a different size
resistor, make about a 20% jump from the previous
value. 500 or even 510 are not real common. Start
with 470 ohms, 1/2w.
Can anyone shed some light on how acceptable this is, or why and how
I should do something different?
I also am a little troubled by the SkyView instructions for multiple
SV Screens, that CLEARLY state; to electrically connect both left and
right stereo outputs together at each screen connector (creating a
Mono output), PLUS to jumper across all screens. This is to ensure
that regardless of power to any screen, all audio warning will be
heard. This is not only clearly communicated, they provide an example
making clear all 4 audio outputs of a two screen system are twisted
together and fed to one input on the Intercom. Any comments regarding
this instruction?
Hmmmm . . . are these warnings FROM the SkyView
instruments . . . and they are stereo?
You might go the resistor-mixer route here
too starting with 470 ohms in each of the feeds
brought together the OTHER un-switched input to
the PM3000.
If push comes to shove, you can craft an
isolation amp from our DIY plans and ecb
or exploit a number of manufactured options.a
Bob . . .
Message 6
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| Subject: | Re: Flow indicator |
Good Evening All,
A few yeas ago someone on this list mentioned that a fellow had developed
an electronic gadget that could indicate whether or not fuel was flowing
through a line. It consisted of a stock AN aluminum T with the non inline
portion containing some sort of light which could tell when fuel was flowing
through the inline T portion. Nothing fancy and no measurement of the gallons
or flow rate. Just whether or not fuel was flowing. It was pure solid
state. No pin wheels or anything. Just light as I recall, and it only had to
shine one way. It did not go through the T to another sensor. Does anyone
else remember that gadget? If so, do you recall who it was that offered it?
I could sure use an accurate, though economical, way to tell when fuel is
no longer being pumped through a line.
Happy Skies,
Old Bob
Message 7
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| Subject: | Baron Tach Problem |
Today I was assisting local A&P problem solving a tachometer problem in a twin
Baron. Owner reports the tachometer for the left engine does not register RPM
on initial engine start but does register normally after engine warms up. We
swapped the canon plugs to see if the problem would follow the connections.
To our surprise both needles registered properly on start up. We swapped wires
back to appropriate connections and the left needle did not register. We swapped
them again (left lead to right input and right lead to left input) and the
right needle did not register on engine start while the left registered normal
at engine start. In other words, we were able to duplicate owner's experience
on this second attempt. With engine running we wiggled the wires and disconnected/re-connected
the canon plug. Seemed maybe there was a very slight movement
of the needle when re-connected but not sure. After approximately ten
minutes of engine warm up the right needle popped into action as if it became
suddenly unstuck. After changing oil we ran the engines and again experienced
the same problem reported by the owner.
The A&P said he previously disassembled the left engine tach sensor when the owner
initially reported the problem. He found the bearings dry and repacked them.
There was no oil contamination.
All ideas/suggestions are welcomed.
--------
Frank McDonald
Kitfox S7
912S, Sensenich Composite 3 Blade
Acworth, GA
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=414753#414753
Message 8
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| Subject: | Re: Flow indicator |
On 12/2/2013 5:44 PM, BobsV35B@aol.com wrote:
> Good Evening All,
> A few yeas ago someone on this list mentioned that a fellow had
> developed an electronic gadget that could indicate whether or not fuel
> was flowing through a line. It consisted of a stock AN aluminum T with
> the non inline portion containing some sort of light which could tell
> when fuel was flowing through the inline T portion. Nothing fancy and
> no measurement of the gallons or flow rate. Just whether or not fuel
> was flowing. It was pure solid state. No pin wheels or anything. Just
> light as I recall, and it only had to shine one way. It did not go
> through the T to another sensor. Does anyone else remember that
> gadget? If so, do you recall who it was that offered it?
> I could sure use an accurate, though economical, way to tell when fuel
> is no longer being pumped through a line.
> Happy Skies,
> Old Bob
>
These intended for flow, but they do detect the presence of liquid:
http://www.gemssensors.com/Products/Level/Single-Point-Level-Switches/Electro-optic
I've got a couple that I intend to try in the situation you describe,
but I'm afraid it will take a bigger mount point than the leg of a T. No
experience yet on whether they can see fluid in something as small as a
fuel line.
Another option I've considered is a low pressure sensor on the output of
the pump, with a slightly restrictive orifice after the sensor. If
pressure drops below a preset level, it would trip an indicator.
If someone already has a simple & affordable solution, I'd love to hear
about it, as well.
Charlie
Message 9
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| Subject: | Re: Two Audios wired to One PM-3000 input thru a |
500ohm resistor each?
On 12/2/2013 4:05 PM, Robert L. Nuckolls, III wrote:
> <nuckolls.bob@aeroelectric.com>
>
> At 03:00 PM 12/2/2013, you wrote:
> Hi,
>
> I am installing a PM-3000, 11931-A in my SeaRey Amphibian. This device
> has two Un-switched inputs, and I have three audio output warning
> devices. I have gained some understanding from the archives that an
> isolation amplifier is needed to make this work properly, but the
> SeaRey factory and dealer are telling me that all I need to do is to
> connect my Gear Alert and my Power Buss alert audio wires to a 500ohm
> resistor each, and connect them to a single un-switched audio input on
> the PM-3000. Both of these devices have adjustable gain. The remaining
> input connects to the SkyView audio out.
>
> The instruction is qualified with the fact that this has been
> performed satisfactorily on many of these aircraft. Yet what I learned
> from The List, and from AE Connection, leaves me skeptical.
>
> I sent a note to PS Engineering over a week ago, no response yet.
>
> The two-resistor-mixer technique will work. You
> may find it useful/necessary to fiddle the
> the resistor sizes to get the volume you want
> from each tone. Increasing the size of the resistor
> decreases volume. When trying a different size
> resistor, make about a 20% jump from the previous
> value. 500 or even 510 are not real common. Start
> with 470 ohms, 1/2w.
>
>
> Can anyone shed some light on how acceptable this is, or why and how I
> should do something different?
>
> I also am a little troubled by the SkyView instructions for multiple
> SV Screens, that CLEARLY state; to electrically connect both left and
> right stereo outputs together at each screen connector (creating a
> Mono output), PLUS to jumper across all screens. This is to ensure
> that regardless of power to any screen, all audio warning will be
> heard. This is not only clearly communicated, they provide an example
> making clear all 4 audio outputs of a two screen system are twisted
> together and fed to one input on the Intercom. Any comments regarding
> this instruction?
>
> Hmmmm . . . are these warnings FROM the SkyView
> instruments . . . and they are stereo?
>
> You might go the resistor-mixer route here
> too starting with 470 ohms in each of the feeds
> brought together the OTHER un-switched input to
> the PM3000.
>
> If push comes to shove, you can craft an
> isolation amp from our DIY plans and ecb
> or exploit a number of manufactured options.a
>
>
> Bob . . .
The Skyview might have the series resistor already in its audio output
circuit. That would make it very simple for the installer (supplying the
summing resistors), and guarantee load fault protection for the audio amp.
Charlie
Message 10
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| Subject: | Re: Flow indicator |
Good Evening Charlie,
The one I remember was built by a homebuilder and offered to the OBAM
public. His was mounted in an AN T for 3/8ths inch line.
Thanks for the information provided.
Happy Skies,
Old Bob
In a message dated 12/2/2013 7:14:55 P.M. Central Standard Time,
ceengland7@gmail.com writes:
On 12/2/2013 5:44 PM, _BobsV35B@aol.com_ (mailto:BobsV35B@aol.com) wrote:
Good Evening All,
A few years ago someone on this list mentioned that a fellow had developed
an electronic gadget that could indicate whether or not fuel was flowing
through a line. It consisted of a stock AN aluminum T with the non inline
portion containing some sort of light which could tell when fuel was flowing
through the inline T portion. Nothing fancy and no measurement of the
gallons or flow rate. Just whether or not fuel was flowing. It was pure solid
state. No pin wheels or anything. Just light as I recall, and it only had to
shine one way. It did not go through the T to another sensor. Does anyone
else remember that gadget? If so, do you recall who it was that offered it?
I could sure use an accurate, though economical, way to tell when fuel is
no longer being pumped through a line.
Happy Skies,
Old Bob
These intended for flow, but they do detect the presence of liquid:
http://www.gemssensors.com/Products/Level/Single-Point-Level-Switches/Electr
o-optic
I've got a couple that I intend to try in the situation you describe, but
I'm afraid it will take a bigger mount point than the leg of a T. No
experience yet on whether they can see fluid in something as small as a fuel
line.
Another option I've considered is a low pressure sensor on the output of
the pump, with a slightly restrictive orifice after the sensor. If pressure
drops below a preset level, it would trip an indicator.
If someone already has a simple & affordable solution, I'd love to hear
about it, as well.
Charlie
Message 11
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| Subject: | Re: Flow indicator |
I did see this on the GEM site, but it's for 1/2" npt:
http://www.gemssensors.com/en/Products/Flow/Flow-Switches/FS-600%20No-Moving-parts
On 12/2/2013 7:30 PM, BobsV35B@aol.com wrote:
> Good Evening Charlie,
> The one I remember was built by a homebuilder and offered to the OBAM
> public. His was mounted in an AN T for 3/8ths inch line.
> Thanks for the information provided.
> Happy Skies,
> Old Bob
> In a message dated 12/2/2013 7:14:55 P.M. Central Standard Time,
> ceengland7@gmail.com writes:
>
> On 12/2/2013 5:44 PM, BobsV35B@aol.com wrote:
>> Good Evening All,
>> A few years ago someone on this list mentioned that a fellow had
>> developed an electronic gadget that could indicate whether or not
>> fuel was flowing through a line. It consisted of a stock AN
>> aluminum T with the non inline portion containing some sort of
>> light which could tell when fuel was flowing through the inline T
>> portion. Nothing fancy and no measurement of the gallons or flow
>> rate. Just whether or not fuel was flowing. It was pure solid
>> state. No pin wheels or anything. Just light as I recall, and it
>> only had to shine one way. It did not go through the T to another
>> sensor. Does anyone else remember that gadget? If so, do you
>> recall who it was that offered it?
>> I could sure use an accurate, though economical, way to tell when
>> fuel is no longer being pumped through a line.
>> Happy Skies,
>> Old Bob
>>
> These intended for flow, but they do detect the presence of liquid:
>
> http://www.gemssensors.com/Products/Level/Single-Point-Level-Switches/Electro-optic
>
> I've got a couple that I intend to try in the situation you
> describe, but I'm afraid it will take a bigger mount point than
> the leg of a T. No experience yet on whether they can see fluid in
> something as small as a fuel line.
>
> Another option I've considered is a low pressure sensor on the
> output of the pump, with a slightly restrictive orifice after the
> sensor. If pressure drops below a preset level, it would trip an
> indicator.
>
> If someone already has a simple & affordable solution, I'd love to
> hear about it, as well.
>
> Charlie
>
> *
>
> *
>
> *
>
> *
Message 12
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| Subject: | Re: Flow indicator |
Good Evening Charlie,
That has to be getting close!
Happy Skies,
Old Bob
In a message dated 12/2/2013 8:00:59 P.M. Central Standard Time,
ceengland7@gmail.com writes:
I did see this on the GEM site, but it's for 1/2" npt:
http://www.gemssensors.com/en/Products/Flow/Flow-Switches/FS-600%20No-Moving
-parts
On 12/2/2013 7:30 PM, _BobsV35B@aol.com_ (mailto:BobsV35B@aol.com) wrote:
Good Evening Charlie,
The one I remember was built by a homebuilder and offered to the OBAM
public. His was mounted in an AN T for 3/8ths inch line.
Thanks for the information provided.
Happy Skies,
Old Bob
In a message dated 12/2/2013 7:14:55 P.M. Central Standard Time,
_ceengland7@gmail.com_ (mailto:ceengland7@gmail.com) writes:
On 12/2/2013 5:44 PM, _BobsV35B@aol.com_ (mailto:BobsV35B@aol.com) wrote:
Good Evening All,
A few years ago someone on this list mentioned that a fellow had developed
an electronic gadget that could indicate whether or not fuel was flowing
through a line. It consisted of a stock AN aluminum T with the non inline
portion containing some sort of light which could tell when fuel was flowing
through the inline T portion. Nothing fancy and no measurement of the
gallons or flow rate. Just whether or not fuel was flowing. It was pure solid
state. No pin wheels or anything. Just light as I recall, and it only had to
shine one way. It did not go through the T to another sensor. Does anyone
else remember that gadget? If so, do you recall who it was that offered it?
I could sure use an accurate, though economical, way to tell when fuel is
no longer being pumped through a line.
Happy Skies,
Old Bob
These intended for flow, but they do detect the presence of liquid:
http://www.gemssensors.com/Products/Level/Single-Point-Level-Switches/Electr
o-optic
I've got a couple that I intend to try in the situation you describe, but
I'm afraid it will take a bigger mount point than the leg of a T. No
experience yet on whether they can see fluid in something as small as a fuel
line.
Another option I've considered is a low pressure sensor on the output of
the pump, with a slightly restrictive orifice after the sensor. If pressure
drops below a preset level, it would trip an indicator.
If someone already has a simple & affordable solution, I'd love to hear
about it, as well.
Charlie
(http://www.aeroelectric.com/)
(http://www.buildersbooks.com/)
(http://www.homebuilthelp.com/)
(http://www.mypilotstore.com/)
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