Today's Message Index:
----------------------
1. 03:27 AM - schematic software (Roger Sherriff)
2. 04:30 AM - Visio symbols (Josh Tinkham)
3. 05:18 AM - Re: Re: Dual Battery design (Robert L. Nuckolls, III)
4. 05:26 AM - Re: Re: Starter Contactors (Robert L. Nuckolls, III)
5. 05:45 AM - Re: Re: Starter Contactors (C&K)
6. 09:26 AM - Re: Starter Contactors (reaper)
7. 09:37 AM - Re: schematic software (reaper)
8. 10:02 AM - Re: Re: Starter Contactors (Charlie England)
9. 10:12 AM - Re: Starter Contactors (reaper)
Message 1
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| Subject: | schematic software |
Hi List,
Where can I get hold of the software for a Macbook used to make the schemat
ics often seen here and in the AEC?
Thank you,
Roger.
Message 2
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Starting to draw out my power distrobution diagram, would like to use the
AeroElectric symbols. I found them on github (https://github.com/
crrobinson14/aeroelectric_visio) but they are a really old version. My
visio install has a security setting (that I cannot change) that won't
allow pre-2002 files to be imported.
Does anyone have a newer version of this library?
Message 3
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| Subject: | Re: Dual Battery design |
At 03:42 PM 1/20/2017, you wrote:
>
>Thanks Bob. I remember reading sometime back about a proposed
>alternative to the Z-19 dual battery design. Is there one that has
>still not been published in the book?
Let's back up a bit. What is it about Z-19 that
makes it attractive to your project? Keep
in mind that the z-figures are not 'wire books'.
They do not propose to SPECIFY sizes of wires,
size/style of protection, size or type of battery(ies),
size of alternators, style of switches, etc.
They are illustrations that suggest architectures
that strive for the elegant solution to meeting
design goals that FIT your machine/mission profiles.
M/MP. Z-14 MIGHT make sense for a Lancair IVP, but
Z-13/8 could very well accomplish the builder's
M/MP.
The Z-figures do indeed show some SIZED protective
devices and similarly sized wires . . . but EVERY
component you choose to install should be verified
for suitability to task and evaluated for how it
fits into your failure mode effects analysis.
How can it fail? How would I know it failed in
flight? Would failure present an unacceptable
level of risk to comfortable termination of
flight? Is the failure pre-flight detectable?
What is my Plan-B for making such failures
a simple maintenance issue as opposed to an
emergency?
So tell us about your project. How to do plan
to use it? In your cruise down the isles of
simple ideas in the 'Connection, what features
offered seem a best-fit for design goals based
on your M/MP?
The Dual battery concepts were crafted in response
to the rise in interest for using electrically dependent
engines in aircraft. HOWEVER, having an electrically
dependent engine does not necessarily dictate that
two batteries are the best choice.
Let's talk about it . . .
Bob . . .
Message 4
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| Subject: | Re: Starter Contactors |
>If I wanted to add a starter engaged light connected to "I" while
>using that terminal to engage the starter solenoid would it work to
>place a good sized resistor in series with the lamp?
If your 'lamp' is an LED, it will REQUIRE
some series resistance to set the operating
current for the device. Some LED fixtures
offered as "12 volt" operation already have
a resistor installed.
If your proposed LED installation does not
have the necessary resistor, then you'll need
to add it. Putting it into the wire at or near
the "I" terminal. Here's one way to do it.
http://tinyurl.com/kyc6tq6
If there's already a resistor in your fixture,
ADDING some more ohms at the "I" terminal
would eliminate the need for a fuse while
not seriously affecting LED intensity in
the cockpit. A 100 ohm, 1-Watt resistor is
mechanically robust and easy to incorporate
into the wire.
Bob . . .
Message 5
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| Subject: | Re: Starter Contactors |
Many marine and aftermarket key switches have a substantial rating such
as 25 Amps on the package which has mislead me in the past. That rating
is often the total contact rating. ie 5 for starter, 10 for ignition,
and 10 for accessories.
Nevertheless in my case the starting contacts are still working fine
after several thousand starts wired directly to the solenoid and with
the recommended diode. My subaru starter solenoid has two windings so
that the pull in current is quite high (more than 30 amps) but then
after pull in, only the second winding flows current (about 9 amps) .
Ken
On 20/01/2017 11:21 PM, reaper wrote:
>
>
> nuckolls.bob(at)aeroelect wrote:
>> At 03:51 PM 6/25/2015, you wrote:
>>
>>>
>>> Just curious what the advantage might be to wiring according to Skytec. You
get rid of starter relay, but you have to replace standard aviation mag/starter
switch with one that will carry 30 amps of current, or roughly 360 watts.
Does anyone even make an ignition switch that can handle that load, or would
you have to split off the starter to a separate toggle that can handle the current?
>> That 30A number is exceedingly transient.
>> Further, switches are 'rated' in rather
>> conventional sense that strives for tens
>> of thousands of operating cycles at the
>> specified load.
>>
>> The starter engagement switch in an airplane
>> sees only hundreds of cycles per year and
>> most even fewer.
>>
>> The AD against the legacy ACS510 was a response
>> to the extra ordinary wear for having been
>> tasked with controlling the modern solenoid-
>> contactor where a major improvement in service
>> life was achieved by simply adding the diode to
>> mitigate contact-opening stress as opposed
>> to contact closure stresses. This fix alone seems
>> to have achieve a satisfactory service life
>> when driving the solenoid-contactor.
>>
>> There are some solid state options for relieving
>> stresses on the starter switch. A device like
>> the BTS50055 hi-side switch from Infineon can
>> be incorporated as a robust, solid state switch
>> to handle the solenoid-coil current thus dropping
>> switch current to mere milliamps.
>>
>> http://tinyurl.com/q9q5h74
>>
>> There is another option for adding the external
>> contactor on a PM starter and dealing with the
>> run-on problem.
>>
>> [img]cid:.0[/img]
>>
>> You can use the contactor's "I" terminal
>> to energize the solenoid-contactor yet
>> release it the same time that the starter
>> switch opens.
>>
>> It seems that there are a lot more after market
>> opportunities to buffer the load presented
>> to and EXISTING or legacy start switch than
>> there is to replace it with something with
>> an extra-ordinary specification for robustness.
>>
>>
>>
>>
>> Bob . . .
>
> If I wanted to add a starter engaged light connected to "I" while using that
terminal to engage the starter solenoid would it work to place a good sized resistor
in series with the lamp?
>
> dave
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=465297#465297
>
>
Message 6
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| Subject: | Re: Starter Contactors |
nuckolls.bob(at)aeroelect wrote:
>
> > If I wanted to add a starter engaged light connected to "I" while using that
terminal to engage the starter solenoid would it work to place a good sized
resistor in series with the lamp?
>
> If your 'lamp' is an LED, it will REQUIRE
> some series resistance to set the operating
> current for the device. Some LED fixtures
> offered as "12 volt" operation already have
> a resistor installed.
>
> If your proposed LED installation does not
> have the necessary resistor, then you'll need
> to add it. Putting it into the wire at or near
> the "I" terminal. Here's one way to do it.
>
> http://tinyurl.com/kyc6tq6 (http://tinyurl.com/kyc6tq6)
>
> If there's already a resistor in your fixture,
> ADDING some more ohms at the "I" terminal
> would eliminate the need for a fuse while
> not seriously affecting LED intensity in
> the cockpit. A 100 ohm, 1-Watt resistor is
> mechanically robust and easy to incorporate
> into the wire.
>
>
> Bob . . .
Something along these lines?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=465311#465311
Attachments:
http://forums.matronics.com//files/strwrn_729.jpg
Message 7
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| Subject: | Re: schematic software |
Dassault Draftsight: I've been using the Windows version, but they have a beta
OsX version which I expect would work. Opens the 'connection dwg files just fine.
http://www.3ds.com/products-services/draftsight-cad-software/free-download/
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=465312#465312
Message 8
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| Subject: | Re: Starter Contactors |
On Sat, Jan 21, 2017 at 11:24 AM, reaper <grimmer.de@gmail.com> wrote:
>
>
> nuckolls.bob(at)aeroelect wrote:
> >
> > > If I wanted to add a starter engaged light connected to "I" while
> using that terminal to engage the starter solenoid would it work to place a
> good sized resistor in series with the lamp?
> >
> > If your 'lamp' is an LED, it will REQUIRE
> > some series resistance to set the operating
> > current for the device. Some LED fixtures
> > offered as "12 volt" operation already have
> > a resistor installed.
> >
> > If your proposed LED installation does not
> > have the necessary resistor, then you'll need
> > to add it. Putting it into the wire at or near
> > the "I" terminal. Here's one way to do it.
> >
> > http://tinyurl.com/kyc6tq6 (http://tinyurl.com/kyc6tq6)
> >
> > If there's already a resistor in your fixture,
> > ADDING some more ohms at the "I" terminal
> > would eliminate the need for a fuse while
> > not seriously affecting LED intensity in
> > the cockpit. A 100 ohm, 1-Watt resistor is
> > mechanically robust and easy to incorporate
> > into the wire.
> >
> >
> > Bob . . .
>
>
> Something along these lines?
> Why the anl60? Starter current could blow it, and if the start contactor
> is next to the master contactor, no protection is needed.
Message 9
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| Subject: | Re: Starter Contactors |
Sorry, The wire from the battery is not depicted. The battery is 12 feet away.
The ANL 60 is from the Alternator B lead.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=465314#465314
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