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  1. #1
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    Start valve lights?

    I have the start valve lights working on the LED64 card. They come on with the start switch and go out when the switch is released.

    OK,, that works , but I was wondering about the primary pump lights. They should come on when the start switch is pressed ( like the start valve lights) but they should go out about 2 sec or so before the Start switch is released and the valve lights go out.
    ( this is for a Convair turboprop)

    Is there a way I can use the same FS variable (engine start switch) for the primary pump lights BUT put a delay of a couple seconds on the valve lights or speed up the shut off of the pump lights. Have the pump light go out a couple of sec before the start switch is released ??

    Thanks !

  2. #2
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    Re: Start valve lights?

    Did you try the timer component?

  3. #3
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    Re: Start valve lights?

    Thanks for the reply.

    I just nticed I still have .18 so I will install .21 and give it a try,, thanks.

  4. #4
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    Re: Start valve lights?

    OK,, i got the timer to turn the light on with a delay but I can't figure out how to get the light to turn off before the start switch is turned of??

    The start switch is held on for 8 sec. The primary pump light should come on when the start switch is engaged and it should turn off approx. 1 or 2 sec before the start switch is disengaged.

    Could I use the timer function to turn the led off after 7 0r 8 seconds,, even with the starter switch still pressed??

    Thanks in advance.
    brian.

  5. #5
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    Re: Start valve lights?

    Another approach - instead of using a timer, alternative might be to use engine rpm to turn lights on and off - with start switch engaged.
    i.e. Use range of engine rpm in conjunction with start switch state.

    Is start switch magnetically-held or is switch disengaged manually?
    Last edited by CocnutAir; 01-09-2011 at 06:45 PM.

  6. #6
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    Re: Start valve lights?

    Sounds like a good idea,, to use rpm ! I will give it a try.

    The start switch is held down maually. The primary pump light comes on for a few seconds during the time the start switch is engaged as a test function for the primary fuel pump. If that light doesn't come on,, start sequence is aborted because fuel will not be adequate for light up.

    Thanks again!! I will let you know how it works.

    P.S. Just thought of something. I will use an output for the start switch and an output for rpm on the circuit or else the light will come on every time I reduce power in flight??

  7. #7
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    Re: Start valve lights?

    As this is fuel pump, how about using fuel flow instead of engine rpm? There is an offset for fuel flow.

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