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Fuel Pump - dual switching

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leckers

Joined: 09 Apr 2010
Posts: 3
Location: France

Posted: Sat Apr 10, 2010 12:34 am Post subject: Fuel Pump - dual switching

I have the original panel mounted switch for the fuel pump on my Glasair - simple 'on/off'. On the copilot side I have the stock stick and only a single PTT on the grip. On the pilot side, I have JD's Infinity grip with one of the switches (at present it is a simple on/off) ear-marked to also operate the fuel pump. I need to retain the panel switch capability so the copilot can operate the pump if (s)he is flying. 

My thoughts were along the lines of a switching system like the staircase example of a switch at top and bottom being able to turn on or off the light from either position. I would be quite happy to have a warning lamp to indicate the pump is actually on/running. I need a different type of S700 switch (Which?) on the panel, and also need to find a smaller equivalent type to fit in JD's grip - both of which accomplish the necessary internal switching. (I definitely need assistance with a simple wiring diagram too!). I don't see the necessity for a relay set-up as I've used for the flaps with a similar scenario - normal panel switch and JD's toggle switch on pilot's stick grip. I've been through the chapter in Bob's book on switches a couple of times, but I can't find an applicable example to help me on this - though it is, I have to say, that I may be me missing the obvious - "can't see the wood for the trees" etc. etc.

This particular switching scenario must have been resolved many times before, and I'd be most grateful if a member could point me in the right direction?

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IanL

bgray(at)glasair.org
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Posted: Sat Apr 10, 2010 3:33 am Post subject: Fuel Pump - dual switching

Hi Ian,



Check a house wiring book.



Bruce

www.Glasair.org 



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mrspudandcompany(at)veriz
Guest

Posted: Sat Apr 10, 2010 5:49 am Post subject: Fuel Pump - dual switching

I have the original panel mounted switch for the fuel pump on my Glasair -

simple 'on/off'. On the copilot side I have the stock stick and only a

single PTT on the grip. On the pilot side, I have JD's Infinity grip with

one of the switches (at present it is a simple on/off) ear-marked to also

operate the fuel pump. I need to retain the panel switch capability so the

copilot can operate the pump if (s)he is flying. 

IanL

		Here is a simple circuit that requires using 2 single pole

double throw (on - on) switches.  Hope this helps a bit.



		Roger

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bbradburry(at)bellsouth.n
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Posted: Sat Apr 10, 2010 6:57 am Post subject: Fuel Pump - dual switching

IanL,

I doubt you will find a switch small enough to fit in JDs grip that will

carry the amps necessary for the fuel pump.  If you already know how to do

this with a relay, I suggest you go ahead with that method.  Or you can

stick a relay in the schematic that was provided by one of the readers.



Bill B 



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fvalarm(at)rapidnet.net
Guest

Posted: Sat Apr 10, 2010 10:09 am Post subject: Fuel Pump - dual switching

While the schematic in the drawing will work, I wouldn't use that architecture because it will be confusing.  Sometimes switch toggle up will be on and sometimes switch down will be on, depending on the position of the other switch.  That drawing is OK for light switches at home or for pushbutton latching switches.  

I would just wire both switches in parallel so that either one can turn the pump on, but both must be off to turn pump off.  I think this would be best and satisfy 99% of your flying needs without confusion.  

My $.02 worth.   

Bevan  

 

  

_____________________________________________   

From:   owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com)]  On Behalf Of ROGER &  JEAN CURTIS  

Sent:   Saturday, April 10, 2010 6:47 AM  

To:     aeroelectric-list(at)matronics.com  

Subject:        Fuel Pump - dual switching  

 

  

I have the original panel mounted switch for the fuel pump on my Glasair - simple 'on/off'. On the copilot side I have the stock stick and only a single PTT on the grip. On the pilot side, I have JD's Infinity grip with one of the switches (at present it is a simple on/off) ear-marked to also operate the fuel pump. I need to retain the panel switch capability so the copilot can operate the pump if (s)he is flying.   

IanL  

  

Here is a simple circuit that requires using 2 single pole double throw (on - on) switches.  Hope this helps a bit.   

Roger   

 << File: Dual switch fuel pump.pdf >>       [quote][b]

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mrspudandcompany(at)veriz
Guest

Posted: Sat Apr 10, 2010 12:34 pm Post subject: Fuel Pump - dual switching

While the schematic in the drawing will work, I wouldn't use

that architecture because it will be confusing.  Sometimes switch toggle up

will be on and sometimes switch down will be on, depending on the position

of the other switch.  

				When the light is on the pump is on, flip

either switch and it is off.  I personally would not find this confusing.

If up, down is confusing, mount the switch for left, right.

		I would just wire both switches in parallel so that either

one can turn the pump on, but both must be off to turn pump off.  I think

this would be best and satisfy 99% of your flying needs without confusion. 

				If both switches are on they must both be

turned off to shut down the pump. 

				If you are going this route, might I suggest

that you put a switch on the panel within ease reach of either pilot, fewer

parts, fewer single points of failure.

				There are other ways of accomplishing this,

but this is simple and will work.

				Roger

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leckers

Joined: 09 Apr 2010
Posts: 3
Location: France

Posted: Mon Apr 12, 2010 12:48 am Post subject: Re: Fuel Pump - dual switching

Really sorry, but I cannot open either of the .dat files to see the diagram..... Clues? I use Windows 7. Thanks for the suggestions.

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IanL

mrspudandcompany(at)veriz
Guest

Posted: Mon Apr 12, 2010 5:47 am Post subject: Fuel Pump - dual switching

Really sorry, but I cannot open either of the .dat files to see the

diagram..... Clues? I use Windows 7. Thanks for the suggestions.



--------

IanL



		Go to (get.adobe.com) and download the reader.  This will

allow you to open the [Dual switch fuel pump.pdf] file attached.



		 



		Roger

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leckers

Joined: 09 Apr 2010
Posts: 3
Location: France

Posted: Mon Apr 12, 2010 6:07 am Post subject: Re: Fuel Pump - dual switching

Roger - adobe reader will NOT open the file that is in this forum as winmail.dat.

There is no attachment file that I can see in pdf format.

Any chance you could try direct to me ianleckenby(at)yahoo.co.uk? Thanks.

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