Not voltage on pson pin (Duet3 6HC)
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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"andM950 P0 C"pson"; M42 P0 S1with 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?
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@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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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.
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@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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