Today's Message Index:
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1. 08:08 AM - Re: Starting the Engine Reboots the EFIS (user9253)
2. 08:19 AM - Re: Starting the Engine Reboots the EFIS (user9253)
3. 08:25 AM - Re: Starting the Engine Reboots the EFIS (user9253)
4. 08:54 AM - Re: Starting the Engine Reboots the EFIS (user9253)
5. 09:08 AM - Re: Re: Starting the Engine Reboots the EFIS (FLYaDIVE)
6. 11:07 AM - Re: Re: Starting the Engine Reboots the EFIS (Ernest Christley)
7. 12:23 PM - Re: Re: Starting the Engine Reboots the EFIS (Jan de Jong)
8. 02:58 PM - Re: Starting the Engine Reboots the EFIS (user9253)
9. 04:27 PM - Re: Starting the Engine Reboots the EFIS (Bill Watson)
Message 1
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| Subject: | Re: Starting the Engine Reboots the EFIS |
Barry,
I used a program called Express.sch
It is free and can be downloaded here:
https://www.expresspcb.com
The program has two parts, the schematic part and the circuit board part.
Use teh schematic part: express.sch
After drawing your diagram, click FILE, EXPORT SCHEMATIC IMAGE.
The only choice for saving is as a BMP file.
Open the bmp file with "PAINT", a program that is built into all versions of Windows.
Crop the picture and then save as a JPG file.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=480173#480173
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| Subject: | Re: Starting the Engine Reboots the EFIS |
Carlos,
I think the aux battery will be recharged. Normally it will only be used for a
few seconds during engine cranking, so it will run down very little. A Schottky
diode will drop 0.4 - 0.5 volts when conducting 5 amps. If the aircraft electrical
system operates at 14.2 volts, then 14.2 - 0.5 = 13.7 volts. That is
enough to recharge a battery, albeit slowly.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=480174#480174
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| Subject: | Re: Starting the Engine Reboots the EFIS |
Art,
The Schottky diode 747-DSA300i45NA that I mentioned earlier is really overkill
for this application. Smaller Schottky diodes are available for less than $1,
although not as robust.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=480175#480175
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| Subject: | Re: Starting the Engine Reboots the EFIS |
Below is an untried circuit for someone who likes to experiment. Instead of using
a heavy lead acid battery, it uses two flashlight batteries in series. Depending
on the load, and considering that the batteries will only be used for
a few seconds at a time, size AA or C or D can be tried. The alkaline batteries
will add 3 volts to the aircraft main battery voltage during engine cranking.
The diode prevents the alkaline batteries from being shorted out. The diode
also keeps the load energized for the few milliseconds while the relay contacts
are in transition. The normally open relay contacts connect the alkaline
batteries during engine start. After starting the engine, the normally closed
relay contacts short out the diode during normal operation to give full voltage
to the load. If the relay coil or N.C. contacts fail, the EFIS will still
get power through the diode. Before I get flamed, I am not necessarily recommending
this circuit, just offering it to experimenters.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=480176#480176
Attachments:
http://forums.matronics.com//files/brownout_alkaline_bat_112.jpg
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| Subject: | Re: Starting the Engine Reboots the EFIS |
Joe:
Thank you very much for the information.
I'll give it a try. I hope it is as intuitive as much as I am software
challenged ;-)
Barry
On Wed, May 16, 2018 at 11:08 AM, user9253 <fransew@gmail.com> wrote:
>
> Barry,
> I used a program called Express.sch
> It is free and can be downloaded here:
> https://www.expresspcb.com
> The program has two parts, the schematic part and the circuit board part.
> Use teh schematic part: express.sch
> After drawing your diagram, click FILE, EXPORT SCHEMATIC IMAGE.
> The only choice for saving is as a BMP file.
> Open the bmp file with "PAINT", a program that is built into all versions
> of Windows.
> Crop the picture and then save as a JPG file.
>
> --------
> Joe Gores
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=480173#480173
>
>
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| Subject: | Re: Starting the Engine Reboots the EFIS |
What would be wrong with throwing a big capacity directly across the power
and ground as close to the EIS as you can?
You gave 5A as the current draw for the e-bus, I doubt the EIS is drawing m
ore than one.=C2- The cap will need to be large enough to make up the dif
ference between the voltage required and where it drops to during the 15 se
conds of cranking.=C2- Part of the caps electrons will back feed to the s
tarter, but that path has the resistance of a lot of connections and thinne
r wires.=C2- Plus, it won't be a direct short to ground.=C2- It has to
compete with another source pumping electrons into the circuit (the battery
).=C2- The cap will get topped off as soon as you stop cranking.
Just make sure to use a slow blow fuse and be done with it.
On Wednesday, May 16, 2018 12:09 PM, FLYaDIVE <flyadive@gmail.com> wrot
e:
Joe:
Thank you very much for the information.
I'll give it a try.=C2- I hope it is as intuitive as much as I am softwar
e challenged ;-)
Barry
On Wed, May 16, 2018 at 11:08 AM, user9253 <fransew@gmail.com> wrote:
Barry,
I used a program called Express.sch
It is free and can be downloaded here:
https://www.expresspcb.com
The program has two parts, the schematic part and the circuit board part.
Use teh schematic part: express.sch
After drawing your diagram, click FILE, EXPORT SCHEMATIC IMAGE.
The only choice for saving is as a BMP file.
Open the bmp file with "PAINT", a program that is built into all versions o
f Windows.
Crop the picture and then save as a JPG file.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/ viewtopic.php?p=480173#480173
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| Subject: | Re: Starting the Engine Reboots the EFIS |
The little device by Eric Jones & Eric Page does this in an organized
manner and with inexpensive parts.
No switching, no batteries.
Give it a try.
Jan de Jong
On 5/16/2018 8:05 PM, Ernest Christley wrote:
> What would be wrong with throwing a big capacity directly across the
> power and ground as close to the EIS as you can?
>
> You gave 5A as the current draw for the e-bus, I doubt the EIS is
> drawing more than one. The cap will need to be large enough to make
> up the difference between the voltage required and where it drops to
> during the 15 seconds of cranking. Part of the caps electrons will
> back feed to the starter, but that path has the resistance of a lot of
> connections and thinner wires. Plus, it won't be a direct short to
> ground. It has to compete with another source pumping electrons into
> the circuit (the battery). The cap will get topped off as soon as you
> stop cranking.
>
> Just make sure to use a slow blow fuse and be done with it.
>
>
> On Wednesday, May 16, 2018 12:09 PM, FLYaDIVE <flyadive@gmail.com> wrote:
>
>
> Joe:
>
> Thank you very much for the information.
>
> I'll give it a try. I hope it is as intuitive as much as I am
> software challenged ;-)
>
> Barry
>
>
> On Wed, May 16, 2018 at 11:08 AM, user9253 <fransew@gmail.com
> <mailto:fransew@gmail.com>> wrote:
>
> <fransew@gmail.com <mailto:fransew@gmail.com>>
>
> Barry,
> I used a program called Express.sch
> It is free and can be downloaded here:
> https://www.expresspcb.com <https://www.expresspcb.com/>
> The program has two parts, the schematic part and the circuit
> board part.
> Use teh schematic part: express.sch
> After drawing your diagram, click FILE, EXPORT SCHEMATIC IMAGE.
> The only choice for saving is as a BMP file.
> Open the bmp file with "PAINT", a program that is built into all
> versions of Windows.
> Crop the picture and then save as a JPG file.
>
> --------
> Joe Gores
>
>
> Read this topic online here:
>
> http://forums.matronics.com/ viewtopic.php?p=480173#480173
> <http://forums.matronics.com/viewtopic.php?p=480173#480173>
>
>
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> Electric-List" rel="noreferrer"
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> -Matt Dralle, List Admin.
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> contribution
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| Subject: | Re: Starting the Engine Reboots the EFIS |
> What would be wrong with throwing a big capacity directly across the power and
ground as close to the EIS as you can?
That solution sounds reasonable in theory. The problem is that the starter motor
would quickly drain the capacitor without a diode to block reverse current.
Another problem is that one big capacitor rated at 15 volts or more would be
impractically humongous. The solution is to use several capacitors, each rated
at less voltage. Eric Jones & Eric Page have already done the engineering.
Read this thread about the Deslumpifier:
http://forum.matronics.com/viewtopic.php?p=477147&sid'd0d83508c5b8d07bf0ea2643e41201
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=480181#480181
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| Subject: | Re: Starting the Engine Reboots the EFIS |
What Tim and others have suggested, TCWTech stuff, will fix it. I used
the power stabilizer to fix this problem in my installation - I have (3)
EFIS units.
On 5/14/2018 10:13 PM, Tim Olson wrote:
>
> Check out TCWTechs stuff. They have both backup batteries, and
> a power stabilizer that they offer that would do the trick.
>
> http://www.tcwtech.com/
>
>
> Tim
>
>
> On 5/14/2018 7:38 PM, Art Zemon wrote:
>> Sebastien,
>>
>> MGL sells the AvioGuard, a DC-to-DC converting power supply for
>> isolating the avionics from the rest of the aircraft system. It
>> supports a backup battery. Cost would be $450 + the battery.
>>
>> I am hoping for a less expensive solution.
>>
>> -- Art Z.
>>
>>
>> On Mon, May 14, 2018 at 7:09 PM, Sebastien <cluros@gmail.com
>> <mailto:cluros@gmail.com>> wrote:
>>
>> Battery for the EFIS? Does MGL make a backup battery for your engine
>> monitor?
>>
>> On Mon, May 14, 2018 at 4:51 PM, Art Zemon <art@zemon.name
>> <mailto:art@zemon.name>> wrote:
>>
>>
>> Folks,
>>
>> I am /finally/to the point on my project of starting the
>> engine. When I first engage the starter, voltage drops so low
>> that my EFIS reboots. The EFIS immediately reboots, less than 1
>> second later, but it takes several seconds for the engine
>> instruments to come back online.
>>
>> It is a 12 volt system. During engine start, the equipment is
>> drawing about 5 amps (other than the starter motor). I need
>> about 9 volts to keep the EFIS from rebooting.
>>
>> I am using figure Z-12 with very minor modifications: replaced
>> the ammeter shunts with hall effect sensors and rearranged the
>> switches a bit. You can see my modified diagram here: engine.pdf
>> <https://drive.google.com/file/d/12DhiCdTSuUNvlsmBK027yQ1mDDy5eRUl/view?usp=sharing>
>>
>> What would be the simplest way to fix this issue?
>>
>>
>>
>> --
>> https://CheerfulCurmudgeon.com/
>>
>> /"If I am not for myself, who is for me? And if I am only for myself,
>> what am I? And if not now, when?" Hillel/
>
>
999
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