Help: NEMA 23 High-Torque Stepper Motors

  • Hello,

    Looking for some help with a rather unusual problem - I'm using fairly large stepper motors, and I'm currently unable to get them to work.

    The motors I'm using are at the following page:

    I've wired the motors in the bipolar parallel configuration according to the diagram. I used A1 as Positive and A2 as negative, similar for B. When I start to home the unit, the motors jerk like they're about to move, but then cut out. I can move them by hand afterward, so I know they aren't idling. I plugged them into the extruder driver and I notice the same behavior - but it will only make a jerk and refuse to move (only the first time I try, thereafter there is no movement until I reset the unit).

    I've plugged in a regular nema 17 in and it will run fine off of the drivers.

    Any suggestions? Here's some of my settings below:
    M92 X40 Y40 Z40 ; Set axis steps/mm
    M906 X2000 Y2000 Z2000 E2000 I60 ; Set motor currents (mA) and increase idle current to 60%
    M201 X50 Y50 Z50 E500 ; Accelerations (mm/s^2)
    M203 X1000 Y1000 Z1000 E3600 ; Maximum speeds (mm/min)
    M566 X500 Y500 Z500 E1200 ; Maximum instant speed changes mm/minute

    My best guess is that I'm triggering some kind of short in the driver. It has the same behavior no matter the motor current (Even 1 mA). I believe I'm running 1.14ish of the firmware. I have a 24V power supply.

  • Try spec'ing a lower current as a test.

    Have you read this?


  • I may have found the problem… whomever developed the 1A 1B 2A 2B notation on drivers (vs A+ A-, B+ B-) deserves to be shot...!topic/ultimaker/zdIKGwMXf28

  • Yeah, that was problem… grumble grumble grumble

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