Enerpac hydraulic pump modification
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  1. #1
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    Default Enerpac hydraulic pump modification

    I have an Enerpac PUD-1100B electric hydraulic pump. This is an economy model does not have a hold feature. It does have an electric solenoid dump valve. A momentary switch runs the pump which advances a single acting cylinder. Releasing this switch opens the solenoid valve which dumps the fluid back to the tank.

    Can I re-wire this so that the solenoid valve is energized and closed until I switch it off causing it to dump the fluid? Opinions/advice?

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    I think it's wired backwards as it is.....

    IIRC after the pump shuts off, it should hold until you
    energize the solenoid to dump back to tank.

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    Per Enerpac

    "PUD-1100B/E and PUD-1101B/E Models
    The PUD-1100B/E and PUD-1101B/E operate single-acting
    cylinders where the hold function is not necessary. Pressing the
    pendant switch starts the motor and advances the cylinder. When
    the switch is released, the cylinder will retract."

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    Quote Originally Posted by rbcmetalwork View Post
    Per Enerpac

    "PUD-1100B/E and PUD-1101B/E Models
    The PUD-1100B/E and PUD-1101B/E operate single-acting
    cylinders where the hold function is not necessary. Pressing the
    pendant switch starts the motor and advances the cylinder. When
    the switch is released, the cylinder will retract."
    Do you want my help or do you want to play lawyer ?

    Pretty much every enerpac style pump I have encountered is as
    I have written.

    What would be so bad about you unhooking qty (2) wires to the solenoid, and putting them on the other push button ?

    Better yet, add a DPDT switch (and nicely labeled) to switch
    the action of the pump/pushbuttons, enabling you
    to simply switch back to the original configuration.

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    I'll try it. Thanks, Doug.

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    Default

    Alternatively, rather than modify the Enerpac pump unit, voiding any warranty and turning it into what it ain't, you could add (between the pump and the cylinder) a check valve and a secondary "return to reservoir" path controlled by a valve or solenoid? YMMV

    By the way, I appreciate (am not offended by) your quoting the Enerpac catalog description. It shows you've done some homework.
    No doubt, Doug will soon pass that bug that's crawled up his arse.


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