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    Not voltage on pson pin (Duet3 6HC)

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    Duet Hardware and wiring
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    • jameshartonundefined
      jamesharton
      last edited by

      I'm replacing a older MKS controller running µCNC with 6HC to drive the new, toquier motors on my MPCNC and I have the 24V output of my PSU running through a relay which I used to control with a GPIO pin on the old controller to turn on/off power to the steppers, etc. I started swapping out the hardware yesterday and so far I have an external 5V supply connected to the "EXT 5V" connector and the board is powering up nicely, however I can't get the "pson" pin to trigger the relay. I have tried both M80 C"pson" and M950 P0 C"pson"; M42 P0 S1 with no luck. I was expecting this pin to come high to 5V when set to on, however I'm not seeing any voltage on the pin.

      Does anyone have any pointers?

      jens55undefined jameshartonundefined 2 Replies Last reply Reply Quote 0
      • jens55undefined
        jens55 @jamesharton
        last edited by

        @jamesharton, a wild guess (and it really is only a wild guess) ..... the pson logic might not be powered up if you are only connecting the external 5V to the 6HC

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        • jameshartonundefined
          jamesharton @jamesharton
          last edited by

          and here I find the solution to my own problem in the docs.

          If you are using an external relay to control mains power to the PSU, you can wire either the +5v or +3.3v (depending on what your relay requires) outputs from the duet in to the positive terminal of the relay, and wire the ground terminal of the relay to the PS_ON output on the duet. If you are using a mechanical relay and it does not include a flyback diode of some sort, you will need to wire one in parallel with the relay signal.

          I feel like a bit of a doofus, but I was unable to find this over the weekend.

          jens55undefined 1 Reply Last reply Reply Quote 0
          • jens55undefined
            jens55 @jamesharton
            last edited by

            @jamesharton said in Not voltage on pson pin (Duet3 6HC):

            I feel like a bit of a doofus, but I was unable to find this over the weekend.

            Happens to me way more often than it should - very annoying!

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            • dc42undefined dc42 marked this topic as a question
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