Heater not working



  • Hi, I just finished wiring up my printer and wanted to test the heaters. Bed works but due to any reason I can't get the hotend heater to work. I already tried a second one, changed from e0 to e1, measured if there is a break in the wiring ( about 15 Ohm so it should fit the 40W rating) and checked the thermistor that works as well.

    I'm using this one from trianglelab: https://de.aliexpress.com/item/32815934251.html?spm=a2g0o.store_home.productList_1322398741.pic_0

    (don't mind the whole code. I scraped the old config.g and uploaded a new one. Didn't do any other changes yet)

    ; General preferences
    G90 ; send absolute coordinates...
    M83 ; ...but relative extruder moves
    M550 P"My Printer" ; set printer name

    ; Network
    M552 S1 ; enable network
    M586 P0 S1 ; enable HTTP
    M586 P1 S0 ; disable FTP
    M586 P2 S0 ; disable Telnet

    ; Drives
    M569 P0 S1 ; physical drive 0 goes forwards
    M569 P1 S1 ; physical drive 1 goes forwards
    M569 P2 S1 ; physical drive 2 goes forwards
    M569 P3 S1 ; physical drive 3 goes forwards
    M569 P4 S1 ; physical drive 4 goes forwards
    M584 X0 Y1 Z2:3 E4 ; set drive mapping
    M350 X16 Y16 Z16:16 E16 I1 ; configure microstepping with interpolation
    M92 X80.00 Y80.00 Z800.00:800.00 E420.00 ; set steps per mm
    M566 X900.00 Y900.00 Z12.00:12.00 E120.00 ; set maximum instantaneous speed changes (mm/min)
    M203 X6000.00 Y6000.00 Z180.00:180.00 E1200.00 ; set maximum speeds (mm/min)
    M201 X500.00 Y500.00 Z20.00:20.00 E250.00 ; set accelerations (mm/s^2)
    M906 X800 Y800 Z800:800 E800 I30 ; set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout

    ; Axis Limits
    M208 X0 Y0 Z0 S1 ; set axis minima
    M208 X370 Y370 Z400 S0 ; set axis maxima

    ; 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 low end on Y via pin ystop
    M574 Z1 S2 ; configure Z-probe endstop for low end on Z

    ; Z-Probe
    M558 P5 C"zprobe.in" H5 F120 T6000 ; set Z probe type to unmodulated and the dive height + speeds
    G31 P200 X0 Y0 Z0 ; set Z probe trigger value, offset and trigger height
    M557 X15:215 Y15:195 S20 ; define mesh grid

    ; 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
    M307 H0 B0 S1.00 ; disable bang-bang mode for the bed heater and set PWM limit
    M140 H0 ; map heated bed to heater 0
    M143 H0 S120 ; set temperature limit for heater 0 to 120C
    M308 S1 P"e0temp" Y"thermistor" T100000 B4725 C7.06e-8 ; configure sensor 1 as thermistor on pin e0temp
    M950 H1 C"e1heat" T1 ; create nozzle heater output on e0heat and map it to sensor 1
    M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit

    ; 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" Q500 ; create fan 1 on pin fan1 and set its frequency
    M106 P1 S1 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
    M575 P1 S1 B57600 ; enable support for PanelDue
    T0 ; select first tool



  • check the 7.5A fuse if its blown using a multimeter



  • Nop the fuse is fine. Just checked. In case if it's blown shouldn't the steppers also not work?



  • just checking, you have updated to firmware version 3.1.1?



  • Yes I did. (FIRMWARE_NAME: RepRapFirmware for Duet 2 WiFi/Ethernet FIRMWARE_VERSION: 3.1.1 ELECTRONICS: Duet WiFi 1.02 or later FIRMWARE_DATE: 2020-05-19b2)



  • i dont see anything wrong in you config. your z settings are redundant but that does not matter.

    also i dont think that the mosfets are both broken.



  • Ok not sure what the error was but it seems to work now. I formated the SD and unpacked the files from the Git into it. Then I installed the update to 3.1.1 again an uploaded a fresh firmware from the fw generator. No idea what went wrong before.


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