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1. 09:34 PM - Re: Fuel System Manager (Eric Page)
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| Subject: | Re: Fuel System Manager |
911pete wrote:
> The HPFS can stay open in Auto. It just needs to be closed in the off position.
In that case, Joe's schematic has you covered. His design should be easy to wire
"in the air" using a chassis-mount relay like this one...
https://www.digikey.com/short/bh10z8v9
...which has the advantage of being easy to replace if it ever fails.
911pete wrote:
> Im using the Garmin G3X with a GAD27. [ . . . ] Either of these units can be
configured for the warning to be active high or low.
OK, I've made it active low. If you change your mind about avionics it will be
compatible with anything on the market.
-----
The schematic, wiring diagram and functional description are attached to this post.
All parts are through-hole, so assembly will be easy. The bill of materials
is here:
https://www.digikey.com/en/mylists/list/CFEKJK5A1K
For anyone else who's following this thread: please critique my schematic. The
more eyes on it the better; let's find my mistakes at zero altitude and zero
airspeed.
NOTE: I assumed that the fluid detection sensors have open contacts in the absence
of fluid and closed contacts in the presence of fluid, that the "C" (common,
white) wire of the sensors will be connected to 24V and the "NO" (normally
open, brown) wire will be used to signal downstream circuits. So, if fuel is
detected then 24V will be present on the brown wire, and if fuel is not detected
then the brown wire will be open circuit.
When everyone's happy, I'll turn this into a circuit board layout.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=516900#516900
Attachments:
http://forums.matronics.com//files/low_fuel_warning_module_rev_a_286.pdf
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