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Starting the Engine Reboots the EFIS
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art(at)zemon.name
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PostPosted: Mon May 14, 2018 3:52 pm    Post subject: Starting the Engine Reboots the EFIS Reply with quote

​​
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
What would be the simplest way to fix this issue?
    -- Art Z.
--
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


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cluros(at)gmail.com
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PostPosted: Mon May 14, 2018 4:11 pm    Post subject: Starting the Engine Reboots the EFIS Reply with quote

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(at)zemon.name (art(at)zemon.name)> wrote:
Quote:
​​
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
What would be the simplest way to fix this issue?
    -- Art Z.
--
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





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art(at)zemon.name
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PostPosted: Mon May 14, 2018 4:40 pm    Post subject: Starting the Engine Reboots the EFIS Reply with quote

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(at)gmail.com (cluros(at)gmail.com)> wrote:
Quote:
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(at)zemon.name (art(at)zemon.name)> wrote:
Quote:
​​
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
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


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brian.lester(at)gmail.com
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PostPosted: Mon May 14, 2018 4:58 pm    Post subject: Starting the Engine Reboots the EFIS Reply with quote

What about something like this?
http://www.tcwtech.com/ibbs_integrated_backup_battery_system_3ah_6ah.html

As long as the rest of your system meets your needs this will at least fix the voltage drop issue for the EFIS.
On Mon, May 14, 2018 at 8:45 PM Art Zemon <art(at)zemon.name (art(at)zemon.name)> wrote:

Quote:
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(at)gmail.com (cluros(at)gmail.com)> wrote:
Quote:
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(at)zemon.name (art(at)zemon.name)> wrote:
Quote:
​​
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
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






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ceengland7(at)gmail.com
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PostPosted: Mon May 14, 2018 5:00 pm    Post subject: Starting the Engine Reboots the EFIS Reply with quote

Ebay for a 'boot/buck switching regulator' sized for your needs (likely way less than$30), and an aux battery sized the same way. Create a 'mini' bus for the items you want to isolate.
If all you want is brownout protection, a little 2 or 3 AH battery shoul be more than enough.
There are other commercial products available that do the same thing, but obviously you will pay more.
Charlie
On May 14, 2018, at 7:45 PM, Art Zemon <art(at)zemon.name (art(at)zemon.name)> wrote:
Quote:
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(at)gmail.com (cluros(at)gmail.com)> wrote:
Quote:
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(at)zemon.name (art(at)zemon.name)> wrote:
Quote:
​​
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
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






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stuart(at)stuarthutchison
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PostPosted: Mon May 14, 2018 5:29 pm    Post subject: Starting the Engine Reboots the EFIS Reply with quote

I can’t help wondering if your primary battery is aged and below par Art, but I second the IBBS from TCW Tech.
Installed in parallel with a decent Schottky diode (bought mine from Eric at http://periheliondesign.com/) it’s a simple way to overcome voltage sag on the bus during start and provides alternate power (hardwired to essential items of your choosing) in an emergency.
Cheers, Stu
Quote:
On 15 May 2018, at 10:56, Brian Lester <brian.lester(at)gmail.com (brian.lester(at)gmail.com)> wrote:
What about something like this? art(at)zemon.name (art(at)zemon.name)> wrote:
Quote:
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(at)gmail.com (cluros(at)gmail.com)> wrote:
Quote:
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(at)zemon.name (art(at)zemon.name)> wrote:
Quote:
​​
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

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







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art(at)zemon.name
Guest





PostPosted: Mon May 14, 2018 5:49 pm    Post subject: Starting the Engine Reboots the EFIS Reply with quote

Charlie,
That sounds like exactly what I need: brownout protection for one to two seconds. Is this the sort of regulator that I need? https://www.ebay.com/itm/DROK-High-Efficiency-Regulator-DC-4-5-30V-to-0-8-28V-12A-Buck-Converter-Const/152990560495
    -- Art Z.


On Mon, May 14, 2018 at 7:59 PM, Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:
Quote:
Ebay for a 'boot/buck switching regulator' sized for your needs (likely way less than$30), and an aux battery sized the same way. Create a 'mini' bus for the items you want to isolate.
If all you want is brownout protection, a little 2 or 3 AH battery shoul be more than enough.
There are other commercial products available that do the same thing, but obviously you will pay more.
Charlie
On May 14, 2018, at 7:45 PM, Art Zemon <art(at)zemon.name (art(at)zemon.name)> wrote:
Quote:
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(at)gmail.com (cluros(at)gmail.com)> wrote:
Quote:
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(at)zemon.name (art(at)zemon.name)> wrote:
Quote:
​​
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
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








--
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


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Bob McC



Joined: 09 Jan 2006
Posts: 258
Location: Toronto, ON

PostPosted: Mon May 14, 2018 6:08 pm    Post subject: Starting the Engine Reboots the EFIS Reply with quote

Read the specifications carefully as the following statement from their specs might be an issue.
"Please note: the negative of input and output wiring cannot be common ground."
Bob McC [quote] --------


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PostPosted: Mon May 14, 2018 6:10 pm    Post subject: Re: Starting the Engine Reboots the EFIS Reply with quote

Here is circuit. A disadvantage is 1/2 volt drop across the Schottky diode.
But if the aircraft electrical system voltage is 14.2 or higher, it should be OK.
Diode part number: 747-DSA300i45NA
If the voltage drop across the diode is not desired, normally closed relay
contacts could be connected in parallel with the diode. Energize the relay
with the start push button.


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Tim Olson



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PostPosted: Mon May 14, 2018 6:14 pm    Post subject: Starting the Engine Reboots the EFIS Reply with quote

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:
Quote:
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(at)gmail.com
<mailto:cluros(at)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(at)zemon.name
<mailto:art(at)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/


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ceengland7(at)gmail.com
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PostPosted: Mon May 14, 2018 6:41 pm    Post subject: Starting the Engine Reboots the EFIS Reply with quote

That one appears to be buck only. Should still work fine if you only expect brownout protection. It can't do full charge voltage, but can likely do around 13-13.5v when fed 14.5 by the alternator.
But if you're doing that, it would be simpler and cheaper to just use a fat schottsky diode. Again, ebay for the best price.
Charlie
On May 14, 2018, at 8:53 PM, Art Zemon <art(at)zemon.name (art(at)zemon.name)> wrote:
Quote:
Charlie,
That sounds like exactly what I need: brownout protection for one to two seconds. Is this the sort of regulator that I need? https://www.ebay.com/itm/DROK-High-Efficiency-Regulator-DC-4-5-30V-to-0-8-28V-12A-Buck-Converter-Const/152990560495
-- Art Z.


On Mon, May 14, 2018 at 7:59 PM, Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:
Quote:
Ebay for a 'boot/buck switching regulator' sized for your needs (likely way less than$30), and an aux battery sized the same way. Create a 'mini' bus for the items you want to isolate.
If all you want is brownout protection, a little 2 or 3 AH battery shoul be more than enough.
There are other commercial products available that do the same thing, but obviously you will pay more.
Charlie
On May 14, 2018, at 7:45 PM, Art Zemon <art(at)zemon.name (art(at)zemon.name)> wrote:
Quote:
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(at)gmail.com (cluros(at)gmail.com)> wrote:
Quote:
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(at)zemon.name (art(at)zemon.name)> wrote:
Quote:
​​
Folks,
I amfinally 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
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








--
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





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PostPosted: Mon May 14, 2018 6:43 pm    Post subject: Starting the Engine Reboots the EFIS Reply with quote

Ooh, good catch!
Charlie
On May 14, 2018, at 9:13 PM, Robert McCallum <robert.mccallum2(at)sympatico.ca (robert.mccallum2(at)sympatico.ca)> wrote:[quote]
Read the specifications carefully as the following statement from their specs might be an issue.

"Please note: the negative of input and output wiring cannot be common ground."
Bob McC
[quote] --------


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yellowduckduo(at)gmail.co
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PostPosted: Mon May 14, 2018 7:03 pm    Post subject: Starting the Engine Reboots the EFIS Reply with quote

Don't you want a boost converter instead of a buck converter?
Ken

On 14/05/2018 10:41 PM, Charlie England wrote:
[quote] Ooh, good catch!

Charlie
On May 14, 2018, at 9:13 PM, Robert McCallum
<robert.mccallum2(at)sympatico.ca <mailto:robert.mccallum2(at)sympatico.ca>>
wrote:

Read the specifications carefully as the following statement from
their specs might be an issue.

"Please note: the negative of input and output wiring cannot be
common ground."

Bob McC

> --------


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rick(at)beebe.org
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PostPosted: Mon May 14, 2018 7:21 pm    Post subject: Starting the Engine Reboots the EFIS Reply with quote

Eric Page, who's on this list, created a device to protect against this
using a large capacitor. He modified an earlier design by Eric Jones. I
bought one from him. It works great on my bench. Should be going in the
plane in the next week or so. His original email is quoted below:

--Rick



I’m starting a new thread on this topic in case anyone who might be
interested missed the recent discussion, here:

http://forum.matronics.com/viewtopic.php?t=16768062

To recap, I’ve adapted Eric Jones’ design for a voltage slump
eliminator (a device to prevent EFIS/EMS brownout/reboot during engine
start) and designed a circuit board for it. The schematic (.PDF) is here:

http://forum.matronics.com/download.php?id=44878

An archive (.ZIP) containing the full design files can be downloaded here:

https://preview.tinyurl.com/yajod9m6

So far one member of the forum has expressed a desire for me to build
one of these for him, so I’ve ordered a batch of circuit boards. If
anyone else wants a complete unit, please let me know so I can order all
of the components at once. You can reply to this thread or contact me
directly.

The cost should be about $35 each, plus postage to your address. I’ll
send a PayPal invoice, along with copies of my receipts, once I know the
exact amount for each device and I have them ready to mail.

I’m happy to part with bare circuit boards as well; again, for my cost
($0.55/ea) plus postage.

Eric

P.S. For anyone seeing this in the future, you can contact me directly
to see if I have any circuit boards on hand. The PDF schematic file
contains a link to Digi-Key that will load a shopping cart with all
necessary components.

On 05/14/2018 07:51 PM, Art Zemon wrote:
Quote:
​​
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?

    -- Art Z.

--
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/


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ceengland7(at)gmail.com
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PostPosted: Mon May 14, 2018 9:11 pm    Post subject: Starting the Engine Reboots the EFIS Reply with quote

See my 1st answer. Smile
Boost only woul not be a good idea; that implies a set point higher than alternator voltage.
Charlie
On May 14, 2018, at 10:07 PM, C&K <yellowduckduo(at)gmail.com (yellowduckduo(at)gmail.com)> wrote:[quote] [quote]--> AeroElectric-List message posted by: C&K <yellowduckduo(at)gmail.com>

Don't you want a boost converter instead of a buck converter?
Ken

On 14/05/2018 10:41 PM, Charlie England wrote:
[quote] Ooh, good catch!

Charlie
On May 14, 2018, at 9:13 PM, Robert McCallum
<robert.mccallum2(at)sympatico.ca <mailto:robert.mccallum2(at)sympatico.ca>>
wrote:

Read the specifications carefully as the following statement from
their specs might be an issue.

"Please note: the negative of input and output wiring cannot be
common ground."

Bob McC

[quote] --------


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jan_de_jong(at)casema.nl
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PostPosted: Mon May 14, 2018 11:26 pm    Post subject: Starting the Engine Reboots the EFIS Reply with quote

I would go for this Voltage Slump Eliminator first -  a passive device.
Switchers must be designed to generate little radiated and conducted
interference - see the discussions on usb-charging.

Jan de Jong

On 5/15/2018 5:19 AM, Rick Beebe wrote:
Quote:


Eric Page, who's on this list, created a device to protect against
this using a large capacitor. He modified an earlier design by Eric
Jones. I bought one from him. It works great on my bench. Should be
going in the plane in the next week or so. His original email is
quoted below:

--Rick



I’m starting a new thread on this topic in case anyone who might be
interested missed the recent discussion, here:

http://forum.matronics.com/viewtopic.php?t=16768062

To recap, I’ve adapted Eric Jones’ design for a voltage slump
eliminator (a device to prevent EFIS/EMS brownout/reboot during engine
start) and designed a circuit board for it.  The schematic (.PDF) is
here:

http://forum.matronics.com/download.php?id=44878

An archive (.ZIP) containing the full design files can be downloaded
here:

https://preview.tinyurl.com/yajod9m6

So far one member of the forum has expressed a desire for me to build
one of these for him, so I’ve ordered a batch of circuit boards.  If
anyone else wants a complete unit, please let me know so I can order
all of the components at once.  You can reply to this thread or
contact me directly.

The cost should be about $35 each, plus postage to your address.
I’ll send a PayPal invoice, along with copies of my receipts, once I
know the exact amount for each device and I have them ready to mail.

I’m happy to part with bare circuit boards as well; again, for my
cost ($0.55/ea) plus postage.

Eric

P.S.  For anyone seeing this in the future, you can contact me
directly to see if I have any circuit boards on hand.  The PDF
schematic file contains a link to Digi-Key that will load a shopping
cart with all necessary components.

On 05/14/2018 07:51 PM, Art Zemon 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?
>
>      -- Art Z.
>
> --
> 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/




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glastar(at)gmx.net
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PostPosted: Mon May 14, 2018 11:45 pm    Post subject: Starting the Engine Reboots the EFIS Reply with quote

Art,

I had a similar issue not sure it is related to yours, my grounding
strap was connected to the engine case but I forgot to clean the paint
of the case, this made for a bad ground (you could feel all the control
lines to the engine heated up). Jump the negative pole of your battery
to your exhaust and try again, my engine started immediately after that
so I did know where to search.

Again, not sure it is related to your case but an easy test.

Cheers Werner

On 15.05.2018 01:51, Art Zemon wrote:
Quote:
​​
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.



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echristley(at)att.net
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PostPosted: Tue May 15, 2018 5:48 am    Post subject: Starting the Engine Reboots the EFIS Reply with quote

For a more DIY experience:
DC/DC Converters | MPJA.COM

<![endif]--> <![endif]-->
<![endif]--> DC/DC Converters | MPJA.COM



On Monday, May 14, 2018 10:09 PM, Robert McCallum <robert.mccallum2(at)sympatico.ca> wrote:



Read the specifications carefully as the following statement from their specs might be an issue.

"Please note: the negative of input and output wiring cannot be common ground."
Bob McC

[quote] --------


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BARRY CHECK 6



Joined: 15 Mar 2011
Posts: 730

PostPosted: Tue May 15, 2018 7:46 am    Post subject: Starting the Engine Reboots the EFIS Reply with quote

Art:
The  simplest thing that would not cost you a penny is to:  Turn the Avionics on AFTER you start the engine.
But, I'm guessing that is not the way you want to go.
Bob must have some reason why grounds cannot be common.  Try his notes second if you do not want to change your starting procedure.  
Side Note:  The 5 Amps you mention on draw are probably the constant current draw and not the peak draw.  Just for S&G's consider the peak to be 3 times the constant.  Now how would that affect your system?
Side Note:  What does the Battery voltage drop to when you hit the starter?  Some starters post notes that if the voltage drops below 10 VDC the charging system or battery or starter connection should be looked into.
The idea of a DC to DC battery backup would work but I do not see why you have to go that elaborate or anywhere that costly.  A simple standby battery and a relay that is energized when the Starter Relay is energized just to supply power to the Avionics would work.  If you think a mechanical relay would be too slow in transferring power you could use a solid-state relay.
As a side benefit the battery could be used as emergency avionics buss power. All that would be needed is a desperate Switch to energizer the Avionics relay.
Good Luck OM,
Barry
On Mon, May 14, 2018 at 7:51 PM, Art Zemon <art(at)zemon.name (art(at)zemon.name)> wrote:
Quote:
​​
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
What would be the simplest way to fix this issue?
    -- Art Z.
--
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





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PostPosted: Tue May 15, 2018 1:05 pm    Post subject: Starting the Engine Reboots the EFIS Reply with quote

Barry,
The EFIS is my engine instruments. If the EFIS is off (or rebooting) then I do not have an oil pressure gauge.
    -- Art Z.

On Tue, May 15, 2018 at 10:44 AM, FLYaDIVE <flyadive(at)gmail.com (flyadive(at)gmail.com)> wrote:
Quote:
The  simplest thing that would not cost you a penny is to:  Turn the Avionics on AFTER you start the engine.

--
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


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