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grease gun using dc motor - current switch

Discussion in 'Sensors and Actuators' started by mqt, Jul 31, 2012.

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    CDRIVE Hauling 10' pipe on a Trek Shift3

    May 8, 2012
    Yes, but as I described in my last post, that's not what Harold's or my circuit does. I don't see a timer in your reply. Considering your description It would seem more logical that a pressure switch should be turning the motor off @ 500PSI and turning it back on at some predetermined lower pressure.
  2. mqt


    Jul 31, 2012
    Sorry, bad description on my behalf.
    The timer is used as your timing diagram suggests; every x seconds, the motor would be powered up again to 'check' if its still drawing too much current (i.e. at high pressure)
    During the motor off period (while the 555 is counting down), if the grease gun was used, pressure would be lower than 500 psi. Once the 555 has counted down, it would turn the motor back on, and not be reset as pressure has dropped. The motor would then run again until it hits 500psi/6A.

    Unfortunately i'm dealing with quite a low budget to add a pressure switch/sensor :(

    CDRIVE Hauling 10' pipe on a Trek Shift3

    May 8, 2012
    Ok, I understand.

    Good luck.
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