Today's Message Index:
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1. 05:49 AM - Re: Fuel System Manager (911pete)
2. 07:49 AM - Re: Fuel System Manager (Eric Page)
3. 08:34 AM - Re: Fuel System Manager (911pete)
4. 08:41 AM - Re: Fuel System Manager (user9253)
5. 09:19 AM - Re: Fuel System Manager (911pete)
6. 11:29 AM - Re: Fuel System Manager (user9253)
Message 1
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| Subject: | Re: Fuel System Manager |
Food for further thought is that I will need another controller to manage the hydraulic
system. It also used a PLC.
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http://forums.matronics.com/viewtopic.php?p=516875#516875
Message 2
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| Subject: | Re: Fuel System Manager |
Here's a quick conceptual doodle showing how the switch wiring might be done to
handle OFF-MANUAL-AUTO switching, using a 2TL1-1 (or, for a much cheaper alternative,
the B&C S700-2-1).
Switched LPFS ground connection to be shared with HPFS using diode steering.
AFC logic remains the hurdle...
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=516876#516876
Attachments:
http://forums.matronics.com//files/switch_concept_287.jpg
Message 3
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| Subject: | Re: Fuel System Manager |
Not being an electronics guy my question is would latching relays utilizing the
fuel sensors be a path to control the logic?
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http://forums.matronics.com/viewtopic.php?p=516877#516877
Message 4
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| Subject: | Re: Fuel System Manager |
Pete, you wrote in a previous post, "The goal is to always keep the main tank
full until the wings are empty". That seems reasonable. It is hard for me to
understand how the fuel computer knows when to open and close the wing tank
valves when there are only two level sensors in the main tank, high and low. It
would not be desirable to let the main tank fuel level go down to the low level
sensor before opening the wing tank valves.
Suppose the computer closes the wing tank valves when the main tank is full.
As fuel is used, the high level sensor tells the computer that the main tank is
no
longer full. The computer could then wait for a period of time, say 5 minutes,
before opening the wing tank valves again. That time delay period needs to be
short enough to keep the main tank relatively full. The time delay also needs
to
be long enough so as not to wear out the solenoid valves due to short cycling.
--------
Joe Gores
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http://forums.matronics.com/viewtopic.php?p=516878#516878
Message 5
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| Subject: | Re: Fuel System Manager |
I think you are mistaking where the low level sensor is. The main tank is approximately
75 gallons. The low level sensor is set at around the 60 gallon level.
The plane burns 1.5 to 2 gallons per minute at non takeoff settings, so the
valves would typically cycle every 7 to 10 minutes. If the fuel gets below the
low level sensor for longer than 20 seconds the low level light would come on
giving you around 30 minutes to land.
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http://forums.matronics.com/viewtopic.php?p=516879#516879
Message 6
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| Subject: | Re: Fuel System Manager |
OK, I modified my drawing in post number 5 by moving the lower fuel level
sensor from the bottom of the tank to a higher position.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=516880#516880
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