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Post by S. Ronin McGowan on Jul 23, 2020 3:50:01 GMT
I am quite sure I've burned out the stepper motor driver for my Z axis on my M3. I was curious if anyone knew the model or part number/name?
Thank you
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oldtech
Full Member
Posts: 222
Machine: Power Route
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Post by oldtech on Jul 23, 2020 4:10:06 GMT
It should be printed on the drive. You may have to remove it to read it.
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Post by S. Ronin McGowan on Jul 23, 2020 7:55:25 GMT
Sorry, nothing on the bottom or top of the driver board. Anyone from MillrightCNC seeing this, could you get in touch please?
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Post by S. Ronin McGowan on Jul 23, 2020 8:17:43 GMT
While I was reinstalling the driver board for my Z axis, I realized that my Z axis has more resistance than usual when powered off. Typically it's just the weight of the router and carriage that causes a little resistance, but now I have moderate to firm resistance even when powered off. However, no increase in resistance when powered on and/or connected to UGS.
Thoughts?
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Post by btreichel on Jul 23, 2020 14:19:43 GMT
While I was reinstalling the driver board for my Z axis, I realized that my Z axis has more resistance than usual when powered off. Typically it's just the weight of the router and carriage that causes a little resistance, but now I have moderate to firm resistance even when powered off. However, no increase in resistance when powered on and/or connected to UGS. Thoughts? While I'm not familiar with the mechanics of yours, I would find out the problem before I put another driver in. BTW, the driver parts are pretty generic, and interchangeable. |
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Post by S. Ronin McGowan on Jul 24, 2020 1:49:08 GMT
I was able to drive the motor just fine by switching the motor cable over to the y axis driver. Y axis motor was put on the axis driver and exhibited the issue. It seems either the shield or the driver are at fault.
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Post by btreichel on Jul 24, 2020 4:33:29 GMT
I was able to drive the motor just fine by switching the motor cable over to the y axis driver. Y axis motor was put on the axis driver and exhibited the issue. It seems either the shield or the driver are at fault. I would say driver. And I suspect that your increased drag in the z overloaded it. |
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Post by fpvmiller on Jul 24, 2020 17:22:28 GMT
DRV8825 stepper drivers
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Post by btreichel on Jul 24, 2020 20:20:18 GMT
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Post by S. Ronin McGowan on Jul 25, 2020 5:13:19 GMT
I would say driver. And I suspect that your increased drag in the z overloaded it. The drag didn't occur until everything went bad on Z-Axis, there wasn't drag and then failure, but I appreciate the input. |
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Post by S. Ronin McGowan on Jul 25, 2020 5:20:23 GMT
Thanks for the input guys, I am definitely to the point of believing the stepper driver is the culprit, most likely caused by the sudden drop of the router moving the motor in reverse too quickly. I need to look at making some sort of protection circuit to stop those damned voltage "backflows" because this would be my 2nd Z axis stepper driver. The first time was caused by me when I was manually moving the Z axis.
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Post by S. Ronin McGowan on Dec 9, 2021 9:17:15 GMT
Just realized that I never came back here and posted that the driver was fried. I replaced it and all is(was?) fine. I'm posting another issue that relates in this board, so I'll see ya'll there  |
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Post by Bruce on Dec 19, 2021 23:31:23 GMT
Thanks for the input guys, I am definitely to the point of believing the stepper driver is the culprit, most likely caused by the sudden drop of the router moving the motor in reverse too quickly. I need to look at making some sort of protection circuit to stop those damned voltage "backflows" because this would be my 2nd Z axis stepper driver. The first time was caused by me when I was manually moving the Z axis. The back voltage generated by moving the motor by hand can definitely mess up the stepper drivers. ( as you've found out) ;-) |
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Post by S. Ronin McGowan on Dec 20, 2021 4:45:19 GMT
Yessir, most definitely. I haven't done any research, but I'm thinking there's got to be a simple fix for this back voltage. Maybe simply a resistor?
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Post by Bruce on Dec 23, 2021 2:57:48 GMT
Yessir, most definitely. I haven't done any research, but I'm thinking there's got to be a simple fix for this back voltage. Maybe simply a resistor?
Not really much you can do but be careful. Due to the fact that the motor effectively becomes a generator when moved, the faster it turns the more voltage generated. Any additional circuity added to the motor would interfere with the motor working properly. Thus moving the gantry slowly by hand is about the only thing you can do or disconnect the motors from the drivers.
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