Issue with Z drivers/motors



  • Hi there,

    My setup has been working fine for a few weeks now, I upgraded the x carriage today whilst the printer was off and the z motors worked perfectly yesterday, however, I turned the system on today and whenever I try move the z axis both motors made a very loud juddering/skipping noise and don't move. I've also tried connecting both z wires with the system off to identical steppers off of the printer with no weight on them, it still makes the same juddering/skipping noise and doesn't move.

    Additionally, as far as I can tell the Z motor driver chip looks fine, no burns or cracks.

    Does anyone have any ideas? Is my board fried?



  • Sounds like its your endstop being triggered



  • I'm using a BLTouch and it's currently open and untriggered



  • Disconnect the Touch and see if it still does it


  • administrators

    @decyg:

    Hi there,

    My setup has been working fine for a few weeks now, I upgraded the x carriage today whilst the printer was off and the z motors worked perfectly yesterday, however, I turned the system on today and whenever I try move the z axis both motors made a very loud juddering/skipping noise and don't move. I've also tried connecting both z wires with the system off to identical steppers off of the printer with no weight on them, it still makes the same juddering/skipping noise and doesn't move.

    Additionally, as far as I can tell the Z motor driver chip looks fine, no burns or cracks.

    Does anyone have any ideas? Is my board fried?

    Have you changed the Z stepper motors or the cables connecting them to the Duet? If so, then you probably don't have the phases connected correctly. Having the phases connected incorrectly produces exactly that symptom.

    If you didn't change anything, then perhaps only one phase of the motors is being driven. Two possible reasons:

    1. Cable break, or bad crimp connection in the cable (you have already ruled out an open circuit motor winding by trying different motors). So try connecting the same or different motors to the Duet using different cables.

    2. If the same problem occurs when you use different cables, the Z motor driver has developed a fault. In which case, ask your supplier to repair or replace the Duet.



  • Ah! I swapped the extruder cable for the Z motor cable as it was longer as part of my upgrade, i'm fairly sure the phases on the motors are different now that i think about it, i'll check carefully and reorder the connections to be in order, thanks for the advice. Will report back if it's still broken



  • That fixed it, thank you very much for the suggestion of where to look dc42!


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