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Cycle Test

Discussion in 'Electronic Design' started by Richard, Aug 13, 2005.

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  1. Richard

    Richard Guest

    What is the simplest way for me to perform a power up / down cycle test on a
    24 volt device.
    I need to have it power up for 3 minutes then shut down for 3 minutes and
    repeat in an endless loop.

    I have a 24 volt timer relay, some standard 24 volt relays, But I'm
    thinking my best bet would be throw a pic up there with a driver chip to
    drive the 80 ma coil on a relay to cycle it. But before I lay all this out
    I thought I would ask for some suggestions in case I'm overlooking some more

  2. Andrew Wade

    Andrew Wade Guest


    if you use pic stuff already and ahve a programmer etc. do it like that then
    when you need a more complex test you can build on it easily..

    PIC, (run it RC )
    resonator / Xtal + 2 ceramic caps. (if not RC)
    two resistors.
    regulator or zener to run pic from same 24V supply.

    have fun.


  3. Tam/WB2TT

    Tam/WB2TT Guest

    Hoow close do you have to be to 3 minutes? Simplest thing would be to run 60
    Hertz through a 14 bit binary counter, which would get you in the ballpark.
    Or, use one of the CMOS counters that include an RC oscillator, and get it
    to within a couple of %. Either way you can use a logic level N channel FET
    to operate the relay, if you need it.

  4. Richard

    Richard Guest

    Thanks, for the suggestions...

    I built one real quick last night. I ran a ULN2808 darlington off the
    parallel port, enabled the freewheeling diode, then ran the output to a
    relay. I have a timer in a dephi program toggling a bit. Oh, 1 hour fix
    and a couple cups of coffee and she was working. about 90 cycles so far,
    since I powered it up.

    Power On. Power Off. - Just like the movie, uhmm, think it was Wax On,
    Wax off.

  5. Rich Grise

    Rich Grise Guest

    Cool! It's always a pleasure to hear success stores on these design
    things. :)
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