Today's Message Index:
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1. 06:25 AM - Re: Which Oil Pressure Switch? (Mudfly)
2. 08:34 AM - Re: Re: Which Oil Pressure Switch? (Ken Ryan)
3. 09:17 AM - Re: Re: Which Oil Pressure Switch? (Charlie England)
4. 09:26 AM - Re: Re: Which Oil Pressure Switch? (M Wilson)
5. 10:55 AM - Re: Which Oil Pressure Switch? (Mudfly)
6. 11:21 AM - Re: Which Oil Pressure Switch? (user9253)
7. 12:04 PM - Re: Which Oil Pressure Switch? (user9253)
8. 12:29 PM - Re: Which Oil Pressure Switch? (Mudfly)
9. 01:58 PM - Re: Which Oil Pressure Switch? (Mudfly)
Message 1
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| Subject: | Re: Which Oil Pressure Switch? |
I've been away from electrical work on my project while I installed
engine and related accessories.
I'm reviving this thread on ways to activate a hobbs meter without
using an oil pressure switch. I have an LED hobbs meter that I would
like to wire so that it will display the hours when the batt switch is on ,
but not count time. I would like the timer to begin when engine is started.
As a review from the previous threads above, I have a 3-terminal
hobbs (+, -, and Enable). The positive terminal is fed from the Main Power Bus
when batt is switched, and negative to firewall ground bus. The LED
digits illuminate with Batt switch on. I now need a way to power the
Enable terminal to begin the timer.
I have an idea but not sure of the part I need or if it even exists.
Here the plan. The positive terminal will have the 12v input from the main power
bus. Also, I will have a feed wire from the positive terminal to
the "Unknown Device". The wire will continue from the unknown
device to the Enable pin on the hobbs meter. The "Unknown Device"
will need to block power until volts are above batt voltage..
say 13V??. When the engine is started and alternator is switched on,
power will pass the unknown device and power the enable terminal of the
hobbs meter.
Does this "Unknown Device" exist, and does the plan seem feasible?
Links to PDF drawings of a simple wire diagram and also tech sheet of the
Honeywell LCD Hour meter.
Thanks for the help.
Shawn
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=513410#513410
Attachments:
http://forums.matronics.com//files/honeywell_lcd_hour_meter_173.pdf
http://forums.matronics.com//files/hobbs_meter_117.pdf
Message 2
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| Subject: | Re: Which Oil Pressure Switch? |
I have a battery charger that senses vibration caused when the engine is
started, and uses that as a trigger. I wouldn't have any idea how to
procure or implement a vibration sensor as a trigger for your Hobbs, but
I'll bet some of the guys on this list do.
On Tue, Mar 26, 2024 at 5:28=AFAM Mudfly <shawntedwards@hotmail.com>
wrote:
> shawntedwards@hotmail.com>
>
> I've been away from electrical work on my project while I installed
> engine and related accessories.
> I'm reviving this thread on ways to activate a hobbs meter without
> using an oil pressure switch. I have an LED hobbs meter that I would
> like to wire so that it will display the hours when the batt switch is on
> ,
> but not count time. I would like the timer to begin when engine is
> started.
> As a review from the previous threads above, I have a 3-terminal
> hobbs (+, -, and Enable). The positive terminal is fed from the Main
> Power Bus when batt is switched, and negative to firewall ground bus. The
> LED
> digits illuminate with Batt switch on. I now need a way to power the
> Enable terminal to begin the timer.
> I have an idea but not sure of the part I need or if it even exists.
> Here the plan. The positive terminal will have the 12v input from the
> main power bus. Also, I will have a feed wire from the positive terminal
> to
> the "Unknown Device". The wire will continue from the unknown
> device to the Enable pin on the hobbs meter. The "Unknown Device"
> will need to block power until volts are above batt voltage..
> say 13V??. When the engine is started and alternator is switched on,
> power will pass the unknown device and power the enable terminal of the
> hobbs meter.
> Does this "Unknown Device" exist, and does the plan seem feasible?
> Links to PDF drawings of a simple wire diagram and also tech sheet of the
> Honeywell LCD Hour meter.
> Thanks for the help.
> Shawn
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=513410#513410
>
>
> Attachments:
>
> http://forums.matronics.com//files/honeywell_lcd_hour_meter_173.pdf
> http://forums.matronics.com//files/hobbs_meter_117.pdf
>
>
===========
===========
===========
===========
===========
>
>
Message 3
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| Subject: | Re: Which Oil Pressure Switch? |
On Tue, Mar 26, 2024 at 8:28=AFAM Mudfly <shawntedwards@hotmail.com>
wrote:
> shawntedwards@hotmail.com>
>
> I've been away from electrical work on my project while I installed
> engine and related accessories.
> I'm reviving this thread on ways to activate a hobbs meter without
> using an oil pressure switch. I have an LED hobbs meter that I would
> like to wire so that it will display the hours when the batt switch is on
> ,
> but not count time. I would like the timer to begin when engine is
> started.
> As a review from the previous threads above, I have a 3-terminal
> hobbs (+, -, and Enable). The positive terminal is fed from the Main
> Power Bus when batt is switched, and negative to firewall ground bus. The
> LED
> digits illuminate with Batt switch on. I now need a way to power the
> Enable terminal to begin the timer.
> I have an idea but not sure of the part I need or if it even exists.
> Here the plan. The positive terminal will have the 12v input from the
> main power bus. Also, I will have a feed wire from the positive terminal
> to
> the "Unknown Device". The wire will continue from the unknown
> device to the Enable pin on the hobbs meter. The "Unknown Device"
> will need to block power until volts are above batt voltage..
> say 13V??. When the engine is started and alternator is switched on,
> power will pass the unknown device and power the enable terminal of the
> hobbs meter.
> Does this "Unknown Device" exist, and does the plan seem feasible?
> Links to PDF drawings of a simple wire diagram and also tech sheet of the
> Honeywell LCD Hour meter.
> Thanks for the help.
> Shawn
>
> 1st thing that comes to mind is a comparator circuit
<https://en.wikipedia.org/wiki/Comparator#:~:text=A%20comparator%20circui
t%20compares%20two,has%20reached%20some%20predetermined%20value.>
. It looks at two inputs, and outputs when the trigger input exceeds the
reference input. If you set the reference input to 13V using a voltage
regulator, then the trigger input would go above that when the alternator
comes on line. Potential downside is that the Hobbs will stop counting if
the alternator fails.
If you don't know about it, a 'Tiny Tach' works in a similar manner but has
an internal battery. The sense lead is normally wrapped around a spark plug
lead; won't work with shielded leads. But you can make it work with a
slight mod to the distributor cap on a mag.
Charlie
<https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_c
ampaign=sig-email&utm_content=webmail>
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Message 4
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| Subject: | Re: Which Oil Pressure Switch? |
You could modify Bob's latest overvoltage module to do what you need.=C2
- Change the trip point to 13.5 volts, and remove the SCR.
>From schematic 9003-630-IP6:Change R7 from 13.7K to 11KRemove Q15Add a wire
from U11B pin 7 to the enable input=C2- of the hour meter.
What we don't know is how much current the enable input to the hour meter d
raws.=C2- To test, place a 2.49K resistor between the enable input of the
hourmeter and 12Volts.=C2- If it starts counting, no additional changes
to the OVM need to be made.=C2-=C2-
On Tuesday, March 26, 2024 at 08:34:33 AM CDT, Mudfly <shawntedwards@ho
tmail.com> wrote:
om>
I've been away from electrical work on my project while I installed
engine and related accessories.=C2-
I'm reviving this thread on ways to activate a hobbs meter without
using an oil pressure switch.=C2- I have an LED hobbs meter that I would
like to wire so that it will display the hours when the batt switch is on ,
but not count time.=C2- I would like the timer to begin when engine is st
arted.
As a review from the previous threads above, I have a 3-terminal
hobbs (+, -, and Enable).=C2- =C2- The positive terminal is fed from th
e Main Power Bus when batt is switched, and negative to firewall ground bus
. The LED
digits illuminate with Batt switch on.=C2- I now need a way to power the
Enable terminal to begin the timer.=C2-
I have an idea but not sure of the part I need or if it even exists.
Here the plan.=C2- The positive terminal will have the 12v input from the
main power bus.=C2- Also, I will have a feed wire from the positive term
inal to
the "Unknown Device".=C2- The wire will continue from the unknown
device to the Enable pin on the hobbs meter.=C2- =C2- The "Unknown Devi
ce"
will need to block power until volts are above batt voltage..
say 13V??.=C2- When the engine is started and alternator is switched on,
power will pass the unknown device and power the enable terminal of the
hobbs meter.=C2- =C2-
Does this "Unknown Device" exist, and does the plan seem feasible?
Links to PDF drawings of a simple wire diagram and also tech sheet of the
Honeywell LCD Hour meter.
Thanks for the help.
Shawn
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=513410#513410
Attachments:
http://forums.matronics.com//files/honeywell_lcd_hour_meter_173.pdf
http://forums.matronics.com//files/hobbs_meter_117.pdf
-
S -
WIKI -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
Message 5
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| Subject: | Re: Which Oil Pressure Switch? |
Thanks for the Ideas.
Kenryan, I have seen the vibration activated hour meters. Definitely
the most simple solution. Unfortunately, I already have the Honeywell
installed in my panel and will try and make that work if I can.
Charlie, I will do some studying of the comparator circuit. Looks like
it could work.
Mike, Thanks for the details on how to modify Bob's overvoltage module.
I haven't been able to locate schematic 9003-630-IP6 you mentioned. I
will keep searching.
Shawn
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=513416#513416
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| Subject: | Re: Which Oil Pressure Switch? |
eBay item number:364742288098 might be the device that you are looking for.
Or maybe this one from Amazon:
https://www.amazon.com/XH-M609-Digital-Disconnect-Discharge-Protection/dp/B07WRZSJ5M
Instructions written in Chinlish:
https://www.robotics.org.za/XH-M609
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=513417#513417
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| Subject: | Re: Which Oil Pressure Switch? |
I used the XH-M609 for a low voltage shutoff and posted about it here with directions:
http://forums.matronics.com/viewtopic.php?t=16776629&postdays=0&postorder=asc&start
I believe that the XH-M609 can also detect high voltage, but am not sure.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=513418#513418
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| Subject: | Re: Which Oil Pressure Switch? |
[quote="user9253"]eBay item number:364742288098 might be the device that you are
looking for.
Or maybe this one from Amazon:
https://www.amazon.com/XH-M609-Digital-Disconnect-Discharge-Protection/dp/B07WRZSJ5M
Instructions written in Chinlish:
https://www.robotics.org.za/XH-M609[/quote]
Interesting Joe.
Looks like the XH-M609 may work. Should I mount it beside my fire extinguisher?:)
Joking..but seriously, for a unit like that would it be
unlikely to cause a major issue if it went into meltdown mode?
Thanks, Shawn
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=513419#513419
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| Subject: | Re: Which Oil Pressure Switch? |
Thanks again gentlemen for the suggestions. As It turns out , after
consulting the folks at Garmin, it looks like I should be able to get 12v
to my Hobbs meter from the GEA24. Pin 9 on connector J243 is labeled
"RPM XDCR+12v -OUT".
Shawn
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=513420#513420
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