----------------------------------------------------------
                           AeroElectric-List Digest Archive
                                      ---
                     Total Messages Posted Sun 02/22/26: 5
           ----------------------------------------------------------
 
 
Today's Message Index:
----------------------
 
     1. 06:38 AM - Re: Fuel System Manager  (Eric Page)
     2. 09:08 AM - Re: Fuel System Manager  (user9253)
     3. 09:29 AM - Re: Fuel System Manager  (user9253)
     4. 09:49 AM - Re: Fuel System Manager  (user9253)
     5. 05:08 PM - Re: Fuel System Manager  (911pete)
 
 
 
________________________________  Message 1  _____________________________________


Time: 06:38:28 AM PST US
Subject: AeroElectric-List: Re: Fuel System Manager
From: "Eric Page" <edpav8r@yahoo.com>


Pete, do you have a datasheet link for your LPFS and HPFS?  I'd like to see their
electrical requirements and what position feedback, if any, they offer.

Yes, latching relays could definitely be part of the solution, but they can't be
driven directly by the fuel level sensors.  This type of relay requires a brief
pulse (a few tens of milliseconds) to set or reset its coil(s) (some have
two), not a continuous current like a normal relay.  This would require some electronics
to turn the long-duration on/off cycles of the level sensors into these
short pulses.

Also, we want the absence of fuel at the Low Level Sensor to open the solenoids,
but we don't want them to close when that sensor sees fuel again; they have
to wait until the High Level Sensor also sees fuel.  That's going to require some
electronics too.


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=516881#516881


________________________________  Message 2  _____________________________________


Time: 09:08:31 AM PST US
Subject: AeroElectric-List: Re: Fuel System Manager
From: "user9253" <fransew@gmail.com>


Eric,
What do you think of the attached circuit?  It uses discrete components.  No computer
necessary.  Integrate it with your switch circuit.

--------
Joe Gores


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=516882#516882


Attachments: 

http://forums.matronics.com//files/valve_control_202.png


________________________________  Message 3  _____________________________________


Time: 09:29:58 AM PST US
Subject: AeroElectric-List: Re: Fuel System Manager
From: "user9253" <fransew@gmail.com>


After thinking about it, why use an AND Gate?
The upper liquid level switch could energize the relay.
The relay can hold through the bottom liquid level switch.

--------
Joe Gores


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=516883#516883


________________________________  Message 4  _____________________________________


Time: 09:49:49 AM PST US
Subject: AeroElectric-List: Re: Fuel System Manager
From: "user9253" <fransew@gmail.com>


Simple relay circuit attached.

--------
Joe Gores


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=516884#516884


Attachments: 

http://forums.matronics.com//files/valve_control__163.png


________________________________  Message 5  _____________________________________


Time: 05:08:57 PM PST US
Subject: AeroElectric-List: Re: Fuel System Manager
From: "911pete" <Pcdebusmann@comcast.net>


Eric

Here is a copy of the specifications for what I will use for the low pressure solenoid.
The original specd solenoid is not available. The high pressure one is
a Dukes aerospace part, they are the original supplier of the low pressure one
as well, but they are no longer in business as well. All the solenoids just
have 2 wires so I assume they are simple on open or closed.

As far as the logic I started investigating Arduino controllers and that might
be the path of least resistance for this whole project.

Pete


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=516885#516885


Attachments: 

http://forums.matronics.com//files/img_1335_168.png


 

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