Stepper motor getting hot



  • Hi, I'm new to the Duet world.

    I recently fitted a duet2 Wifi to my Anycubic Kossel Linear Plus.
    I've been fighting a little but as such it looks OK.

    I just have 1 problem at the moment.
    I can turn on power and all is good.
    If I home all then I get a machinegun like sound from 1 of the steppers (in completely free mechanical motion).
    So this is not due to mechanical issues (which I confirmed with a seperate stepper just on the table and same sound occurs).

    When I start the printer all is as said fine.
    When I home all the sound is there and when homing sequence is done I get a "sizzling" sound from the card it sounds.
    Besides that the stepper motor feels like is not staying in idle like small movements all the time.
    This I assume is causing the motor to get warm really fast and I have to shut down the printer.

    If I remove the stepper concerned then I have no abnormal noise and all the rest keeps cool.
    I have as far as I know now set the same current for XYZ-steppers.

    I tested with a new stepper and this have never cause any issue before but the new one also heats up just being on the table (after having done the home commanc.

    My Config file is as below:

    ; Configuration file for Duet WiFi (firmware version 1.20 or newer)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool on Thu Jul 12 2018 20:54:00 GMT-0500 (Central Daylight Time)

    ; General preferences
    G90 ; Send absolute coordinates...
    M83 ; ...but relative extruder moves

    ;*** The homed height is deliberately set too high in the following - you will adjust it during calibration.

    ; After G32 auto-calibrate, copied from config-override.g
    ; Note: G31 Z (below) affects M665 H, and this is NOT yet calibrated.
    M665 L271.500 R134.638 H296.189 B105.0 X-0.477 Y-0.304 Z0.000
    M666 X-0.910 Y0.111 Z0.799 A0.00 B0.00

    ;Manually copied from Marlin config.h in Anycubic's github repository
    ;M665 R135.4 L271.5 B105 H300 ; Set delta radius, diagonal rod length, printable radius and homed height
    ;M666 X0 Y0 Z0 ; Put your endstop adjustments here, or let auto calibration find them

    ; Network
    M550 PAKL Plus ; Set machine name
    M552 S1 ; Enable network
    ;*** Access point is configured manually via M587
    M586 P0 S1 ; Enable HTTP
    M586 P1 S0 ; Disable FTP
    M586 P2 S0 ; Disable Telnet

    ; Drives
    M569 P0 S1 ; Drive 0 goes forwards
    M569 P1 S1 ; Drive 1 goes forwards
    M569 P2 S1 ; Drive 2 goes forwards
    M569 P3 S1 ; Drive 3 goes forwards
    M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
    M92 X80 Y80 Z80 E413 ; Set steps per mm
    M566 X300 Y300 Z300 E300 ; Set maximum instantaneous speed changes (mm/min)
    M203 X12000 Y12000 Z12000 E12000 ; Set maximum speeds (mm/min)
    M201 X3000 Y3000 Z3000 E3000 ; Set accelerations (mm/s^2)
    M906 X1000 Y1000 Z1000 E1000 I30 ; Set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout

    ; Axis Limits
    M208 Z0 S1 ; Set minimum Z

    ; Endstops
    M574 X2 Y2 Z2 S1 ; Set active high endstops

    ; Z-Probe
    M558 P4 H5 F120 T6000 ; Set Z probe type to switch and the dive height + speeds
    G31 P1000 X0 Y0 Z20.5 ; Set Z probe trigger value, offset and trigger height
    M557 R105 S20 ; Define mesh grid

    ; Heaters
    M305 P0 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 0
    M143 H0 S120 ; Set temperature limit for heater 0 to 120C
    M305 P1 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 1
    M143 H1 S280 ; Set temperature limit for heater 1 to 280C

    ; Fans
    M106 P0 S0.3 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
    M106 P1 S1 I0 F500 H1 T45 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
    M106 P2 S1 I0 F500 H1 T45 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned on

    ; Tools
    M563 P0 D0 H1 ; Define tool 0
    G10 P0 X0 Y0 Z0 ; Set tool 0 axis offsets
    G10 P0 R0 S0 ; Set initial tool 0 active and standby temperatures to 0C

    ; Automatic power saving
    M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; Set voltage thresholds and actions to run on power loss

    ; Custom settings are not configured

    ; Miscellaneous
    M501 ; Load saved parameters from non-volatile memory
    T0 ; Select first tool

    I hope someone can guide me along the way.

    By the way I redid all wiring on the steppers etc and nothing changed.
    I checked the Stepper resistance but all look uniform.

    I'm a bit at a loss at the time.


  • Moderator

    Which tower motor is it?

    It sounds like it may be the driver. You can remap that tower to use an open extruder driver using M584

    https://duet3d.dozuki.com/Wiki/Gcode#Section_M584_Set_drive_mapping



  • Hi Phaedrux

    Thanks for the quick reply

    The issue is on stepper for the Y tower.
    If I understand you right I have to use following command:

    M584 X0.0 Y0.4 Z0.2 E0.3

    ; Drives
    M569 P0 S1 ; Drive 0 goes forwards
    M569 P1 S1 ; Drive 1 goes forwards
    M569 P2 S1 ; Drive 2 goes forwards
    M569 P3 S1 ; Drive 3 goes forwards
    M584 X0.0 Y0.4 Z0.2 E0.3
    M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
    M92 X80 Y80 Z80 E413 ; Set steps per mm
    M566 X300 Y300 Z300 E300 ; Set maximum instantaneous speed changes (mm/min)
    M203 X12000 Y12000 Z12000 E12000 ; Set maximum speeds (mm/min)
    M201 X3000 Y3000 Z3000 E3000 ; Set accelerations (mm/s^2)
    M906 X1000 Y1000 Z1000 E1000 I30 ; Set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout

    I hope this is correct

    Peter


  • Moderator

    Unless you are using the RRF3 beta firmware, you won't use the decimal notation for the drivers.

    But yes, you've got the right idea.



  • @Phaedrux

    Testing a little regarding temp development at idle.
    but as of now it runs muuuuuch better.
    Looks like a shot Stepper driver from new 😞

    Will test a little more before any hasty conclusions

    Thanks for the help so far 😄


  • Moderator

    @Penola said in Stepper motor getting hot:

    Looks like a shot Stepper driver from new

    Possibly. If so, it should be covered under warranty by your supplier.


  • Moderator

    Can you post the results of M122 after trying to move the stepper as configured originally?



  • @Phaedrux

    Sure.
    I've attached 3 files.

    1 When bypassing Y-Driver and not yet idle
    2 When bypassing Y-Driver and idle
    3 as when the issue is present (machine gun noise + hot motor + not reaching full idle)

    At modified status (not idle yet).docx
    At modified status (in idle).docx
    At issue status (never goes to idle).docx


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