Possible blown driver?



  • First I wanted to say I love the interface of this board, it's so great not tinkering with code back and forth and the web interface is awesome- I'm having a Y axis issue though. All other axes are silky smooth. I thought it was a bad stepper motor, so I swapped out all of them, (One was definitely broken- felt like there were no steps) I moved it to the X and Z axes (the bad stepper) and it was definitely not moving. So I got a new set of steppers and plugged them into the board, fired up no problem. I go to home my axes and the Y stutters like it's missing steps.

    The Y axis stepper driver gets SUPER hot really quick, far far hotter than the others. It also has a small indentation on it. I have my motor currents in config.g set for:
    M906 X1200 Y1200 Z1200 E1200 I60. The other axes work perfectly well. Let me know if I should get a new unit from Tim @ Filastruder (who has been super helpful by the way) or if you have any troubleshooting tips. I took a multimeter to all of the resistors and capacitors around this axis and they are the same as the others.

    I have a picture of the little indentation, but can't seem to find the place to add it to this post. I can email it if you guys need me to.

    Thanks!
    Josh



  • Is it a shinny indentation, kind of looks like a sink hole ?

    Thanks,

    Jeff



  • Definitely looks like a sinkhole. If I shine a light on it and look closely I can see a little reflection on the top side of the hole.



  • Sounds like it had a core meltdown to me. I've seen IC's either blow their tops or get so hot they melt the epoxy and it make the nice little shinny sinkhole. Once in a while they separate the layers and vent out the sides. Easy chip to replace if you have a hot air rework station of any quality. I had to replace the main processor on my board due to my own stupidity. It's factory new now.

    Edit: Guess I should include that sometimes they make little pinhole escape routes as well and vent the magic smoke.

    Jeff


  • administrators

    @a96bimmerm3@gmail.com:

    Definitely looks like a sinkhole. If I shine a light on it and look closely I can see a little reflection on the top side of the hole.

    If it's a brand new board, ask Tim for a replacement. Chips fail due to infant mortality sometimes. But also check your Y motor wiring for bad crimp connections.



  • @dc42:

    @a96bimmerm3@gmail.com:

    Definitely looks like a sinkhole. If I shine a light on it and look closely I can see a little reflection on the top side of the hole.

    If it's a brand new board, ask Tim for a replacement. Chips fail due to infant mortality sometimes. But also check your Y motor wiring for bad crimp connections.

    I'm going to toss in…never disconnect while the motors are energized. Sadly this can occur from bad wiring which makes for some nasty voltage spikes.,

    Jeff



  • Words to live by (In)Sanity-

    dc42- BRAND new board, popped and magic smoke around the within the few few minutes of motion. Checked all my crimps for continuity before plugging them in. Got it sorted with Tim, new board on the way. Can't wait to get this thing rocking! I had a RAMPS board with TMC2100s and the duet is WAY quieter, but the web interface and processing of the duet blows it away. The interface really is killer!

    It's an anycubic delta with duet wifi (obviously), new steppers, Igus polymer linear rails, stepper dampers, the non blown axes are SO quiet!



  • I killed the processor on mine, got a new one from Digikey in a couple days and some short solder work later been loving it since It's a great board and firmware. The web interface really is the ticket. I'm looking forward to even more cool features to come.

    Best of luck with the new board.

    Jeff


  • administrators

    Its good that Tim is sending you a new board. I would triple check the wiring on the axis that the driver has blown on, especially look for any possibility that it could have an intermittent fault (for example if it moves or if something moves against it).

    If you have not yet sent the board with the blow driver back to Tim you could remap one of the extruder axis to the Y axis and then run some test moves.



  • @T3P3Tony:

    If you have not yet sent the board with the blow driver back to Tim you could remap one of the extruder axis to the Y axis and then run some test moves.

    The Y axis chip gets so hot that I'm concerned about the board. Tim is shipping it asap, just a waiting game!



  • @T3P3Tony:

    Its good that Tim is sending you a new board. I would triple check the wiring on the axis that the driver has blown on, especially look for any possibility that it could have an intermittent fault (for example if it moves or if something moves against it).

    I'll second this one strongly. In the case of these drivers and most others an intermittent connection kills them faster then a dead short. The coils in the motors have some pretty nasty flyback voltages.

    Jeff


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