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Thread: SSR Question

  1. #1
    Join Date
    May 2007
    Location
    Thomasville, GA
    Posts
    6,000

    SSR Question

    I changed my CNC from the spindle that came with it to a DeWalt DWP611 router to have a beefier device. So far, so good. I wanted to be able to switch it with gcode commands like I did with the DC spindle, so I built a control box with an SSR-25 DA solid state relay. I use 12VDC from my CNC electronics box as the control signal for the SSR, switching it with an isolation relay in the CNC box. It works just fine - mostly. Actually, the process works great but I doubt I would have noticed an issue if the DWP611 didn't have LEDs on it. The router switches off as commanded but the LEDs remain illuminated at a low level. Making some voltage measurements, I see about 30VAC at the output of the relay when it is "OFF". The input control voltage measures 0VDC. I know SSRs have some leakage. Apparently, the internal resistance of the output side of the relay is such that some voltage is passed but at a very low current. Is there a simple way to defeat the leakage?

    Edit: The switch box I built is for the purpose of turning on the router and shop vac when the CNC cut starts.
    Last edited by Bill Arnold; 11-19-2015 at 09:33 PM.
    Bill Arnold
    Citizen of Texas residing in Georgia.
    NRA Life Member and Member of Mensa
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  2. #2
    Join Date
    May 2007
    Location
    Kansas City, Missouri
    Posts
    13,464
    I have mine setup with a light switch to kill the 110v to it, usually also switch off the router when not in use. I think you can add a zener(?) diode to drain off any voltage, but don't recall the schematic for it.
    Darren

    To a small child, the perfect granddad is unafraid of big dogs and fierce storms but absolutely terrified of the word “boo.” – Robert Brault

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