Stepper don't move when using G28 but STEPPER_BUZZ STEPPER=stepper_x works | 3DMeltdown 3D Printing | Page 1

weak badge Nov 29, 2022, 10:02 PM

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Hi. I'm currently configuring the printer.cfg file. I have a BigTreeTech SKR v1.4 turbo mainboard with TMC2209 drivers.
My problem is now, that when I use the G28 command for homing the stepper enables and makes some noise and I have holding current, but it doesn't move.
But the command STEPPER_BUZZ STEPPER=stepper_y and also for y axis is working. What could be the reason?

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Here is my current printer.cfg file

📎 printer.cfg

stone zinc Nov 30, 2022, 5:31 PM

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weak badge Here is my current printer.cfg file

the comments in the config mention that the DIAG pin for the drivers usually has a pullup (the ^ before the pin), did you try using that?

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that could likely be your issue, since the DIAG is the pin that does the detection for sensorless homing, and if it doesnt have a pullup it can create a "floating pin" which can cause unusual readings and may stop the homing if it believes it's already reached the end

weak badge Dec 1, 2022, 4:58 PM

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@stone zinc Hey thank you very much. I didn't tried with the pullup resistor indicator ^. I have found meanwhile the culprit. It was the driver_SGTHRS: 255 setting. The sensitivity was just at maximum. I have it now around 70 for X and around 60 for the Y axis and it's working. But I think its good to enable the pullup resistor anyway, to prevent the floating state?

stone zinc Dec 1, 2022, 4:58 PM

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Yeah that would be a good idea to do

weak badge Dec 1, 2022, 5:23 PM

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Okay thanks again 🙂

#Stepper don't move when using G28 but STEPPER_BUZZ STEPPER=stepper_x works