Overheating Stepper Motors with Duet Maestro
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I recently finished building a Prusa MK3-ish printer using a Haribo 3030 frame and some extra parts I had lying around, including a Duet Maestro. It had been working without problems until recently, when I changed some of the stepper motors out (if it works fix it until it doesn't right?). X and Y axis were changed to the Stepperonline 17HM15-0904S, a 0.9 degree 0.9A rated stepper. Z axis motors were changed to integrated leadscrew steppers from a real Prusa, which from my research are rated at 1.0A each.
Since then I've had significant overheating issues on the X and Z axis motors. Originally I had currents set to 600 for the X-Axis and 560 for the Z-axis (stock value from Prusa firmware). However this caused significant overheating, to the point of layer shifts and failed prints. I have checked the motion of both axes by hand and they don't bind or have rough movement.
I have it mostly under control by adding a heatsink to the X motor, reducing motor current and idle current and switching to spreadcycle mode (not sure if it helped but it didn't seem to hurt at least). However this feels wrong to me - I don't think I should need to reduce motor current so significantly to avoid overheating.
Below is my config.g, and I'm running RRF 3.1.1
; Configuration file for Duet Maestro (firmware version 3) ; executed by the firmware on start-up ; ; generated by RepRapFirmware Configuration Tool v2.1.8 on Sun May 10 2020 22:01:12 GMT-0400 (Eastern Daylight Time) ; General preferences G90 ; send absolute coordinates... M83 ; ...but relative extruder moves M550 P"Ender 3 Pro" ; set printer name M575 P1 S1 B57600 ; turn on paneldue ; Network M552 P192.168.1.14 S1 ; enable network and set IP address M553 P255.255.255.0 ; set netmask M554 P192.168.1.254 ; set gateway M586 P0 S1 ; enable HTTP M586 P1 S0 ; disable FTP M586 P2 S0 ; disable Telnet ; Drives M569 P0 S1 D2 ; physical drive 0 goes backwards M569 P1 S1 D2 ; physical drive 1 goes backwards M569 P2 S1 D2 ; physical drive 2 goes forwards M569 P3 S0 D2 ; physical drive 3 goes backwards and in spreadcycle mode M569 P4 S1 D2 ; physical drive 4 goes backwards M584 X0 Y1 Z2:4 E3 ; set drive mapping M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation M92 X200.00 Y200.00 Z400.00 E409.00 ; set steps per mm M566 X480.00 Y480.00 Z20.00 E270.00 P1 ; Set maximum instantaneous speed changes (mm/min) M203 X12000.00 Y12000.00 Z600.00 E6000.00 ; set maximum speeds (mm/min) M201 X500.00 Y500.00 Z80.00 E5000.00 ; set accelerations (mm/s^2) M906 X550 Y600 Z400 E700 I10 ; set motor currents (mA) and motor idle factor in per cent M84 S30 ; Set idle timeout ; Axis Limits M208 X-20 Y0 Z0 S1 ; set axis minima M208 X220 Y230 Z210 S0 ; set axis maxima M671 X-56.5:272.5 Y115:115 S5 ; set up dual leadscrews with 5mm allowable compensation ; Endstops M574 X1 S1 P"xstop" ; configure active-high endstop for low end on X via pin xstop M574 Y1 S1 P"ystop" ; configure active-high endstop for high end on Y via pin ystop ; Z-Probe M558 P9 C"^zprobe.in" H5 F500 T6000 A6 S0.02 B1 ; set Z probe type to bltouch and the dive height + speeds, also set max probes to 6 and tolerance to 0.02mm G31 P25 X58 Y-10 Z2.215 ; set Z probe trigger value, offset and trigger height larger offset = closer to bed M557 X40:220 Y15:220 P6 ; define mesh grid M376 H15 ;turn off mesh compensation at 15mm ; Heaters M308 S0 P"bedtemp" Y"thermistor" T100000 B4092 ; configure sensor 0 as thermistor on pin bedtemp M950 H0 C"bedheat" T0 ; create bed heater output on bedheat and map it to sensor 0 M143 H0 S125 ; set temperature limit for heater 0 to 150C M307 H0 A164.8 C645.6 D2.6 V24.3 B0 ; disable bang-bang mode for the bed heater and set PWM limit M140 H0 ; map heated bed to heater 0 M308 S1 P"e0temp" Y"thermistor" T100000 B4725 C7.06e-8 ; configure sensor 1 as thermistor on pin e0temp M950 H1 C"e0heat" T1 ; create nozzle heater output on e0heat and map it to sensor 1 M143 H1 S300 ; set temperature limit for heater 1 to 300C M307 H1 A727.1 C198.0 D3.3 V24.4 B0 ; Fans M950 F0 C"fan0" Q500 ; create fan 0 on pin fan0 and set its frequency M106 P0 S0 H-1 ; set fan 0 value. Thermostatic control is turned off M950 F1 C"!fan1" Q100 ; create fan 1 on pin fan1 and set its frequency M106 P1 S0.7 H1 T45 ; set fan 1 value. Thermostatic control is turned on ; Tools M563 P0 D0 H1 F0 ; 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 ; Custom settings are not defined ; Miscellaneous T0 ; select first tool M950 S0 C"zprobe.mod" M950 P1 C"TWCK0" ;define GPIO Pin 1Are there any obvious errors with my config file or any other hardware things I should check?
Thanks
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@copperbricks said in Overheating Stepper Motors with Duet Maestro:
Originally I had currents set to 600 for the X-Axis and 560 for the Z-axis (stock value from Prusa firmware). However this caused significant overheating
how is the duet mounted?
https://duet3d.dozuki.com/Wiki/Mounting_and_cooling_the_board#Section_Cooling
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@copperbricks said in Overheating Stepper Motors with Duet Maestro:
Since then I've had significant overheating issues on the X and Z axis motors.
do you mean the motors or the motor drivers?
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The board is mounted vertically, with venting at the top and whole bottom section of the board. However my issue is the steppers themselves overheating, the mainboard hasn't had any heat issues.
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that is very strange. can you check by running M906 in the console that the motors are actually set to that current.
then can you measure the resistance of one phase of the stepper z motor?
