Problems with Stepper Motors



  • Hello,

    I have a problem with my Stepper Motors.
    After a complete runtime of only around 40 hours 3 of my 5 stepper motors are broken.
    The first was the Z Stepper. He only stutters. To confirm that it was the Stepper and not the driver I changed with an other Stepper and the other Stepper works. After a few hours of printing today both Z Steppers are broken. If I will drive in i.E. Z+ the 2 steppers of Z make different directions or drive in the wrong direction and or they stutters. And here the same. If I change both steppers with other steppers then it works perfect. My steppers are all the same models with exact the same specifications. I had not changed any config.

    Printer:
    Locxess Reptile Extension (https://locxess.de/3D-Drucker-oxid/3D-Drucker-Bausatz-mechanisch-Reptile-Extension-natur-CNC.html)
    with 400x400 Bed and ballscrew in Z and Duet3d Wifi

    Power Supply:
    ?China? S-500-24
    24V 20A

    Stepper Motors:
    Nema17
    Manufacturer Part Number 17HS19-2004S1
    Step Angle 1.8°
    Step Accuracy 5%
    Holding Torque 59Ncm(83.6oz.in)
    Rated Current/phase 2.0A
    Phase Resistance 1.4ohms
    Voltage 2.8V
    Inductance 3.0mH±20%(1KHz)
    Weight 400g

    Config:

    [[language]]
    ; Drives
    M569 P0 S1 ; Drive 0 goes forwards X
    M569 P1 S1 ; Drive 1 goes forwards Y
    M569 P2 S0 ; Drive 2 goes forwards Z
    M569 P3 S1 ; Drive 3 goes forwards
    M350 X64 Y64 Z64 E64 I1 ; Configure microstepping with interpolation
    M92 X320.825 Y320.592 Z3200 E381.471 ; Set steps per mm
    M566 X1200 Y1200 Z15 E120 ; Set maximum instantaneous speed changes (mm/min)
    M203 X6000 Y6000 Z600 E2000 ; Set maximum speeds (mm/min)
    M201 X1000 Y1000 Z400 E400 ; Set accelerations (mm/s^2)
    M906 X1700 Y1700 Z1200 E1500 I30 ; Set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout
    
    

    So why my steppers are not stay alive long time? Are my config wrong or use I the wrong steppers for my printer? I hope everone can help me with the config or better steppers.

    Regards
    Steffen


  • administrators

    Stepper motors are normally very reliable and you appear to be running them below their rated current. So I suspect the problem lies in the cables, not the motors. If the cables unplug from the motors, try swapping the cables. If they don't, then the problem may be in the connector that plugs in to the Duet. First check that the pins crimped on to the wires are fully inserted into the connector shell. If they are, then cut off the connector, strip a little insulation from the ends of the wires, and use a multimeter to check whether both phases have continuity. If they do, then you probably had a bad crimp connection and just need to fit a new connector.



  • Thank you very much.

    My crimped connectors were the reason. All Steppers are working now 🙂

    Regards
    Steffen


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