Extruder fan permanently spinning



  • Can someone help, my extruded fan (not part fan) just spins all the time despite the fact that it should be controlled by the thermostat. No doubt there is something amiss with my config.

    Here it is
    ; Configuration file for Duet WiFi (firmware version 3)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool v3.1.4 on Wed Aug 12 2020 12:40:08 GMT+0100 (British Summer Time)

    ; General preferences
    G90 ; send absolute coordinates...
    M83 ; ...but relative extruder moves
    M550 P"CoreXY" ; set printer name
    M669 K1 ; select CoreXY mode

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

    ; Drives
    M569 P1 S1 ; physical drive 1 goes forwards
    M569 P0 S1 ; physical drive 0 goes forwards
    M569 P2 S0 ; physical drive 2 goes backwards
    M569 P3 S1 ; physical drive 3 goes forwards
    M584 X1 Y0 Z2 E3 ; set drive mapping
    M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
    M92 X100.00 Y100.00 Z400.00 E420.00 ; set steps per mm
    M566 X900.00 Y900.00 Z12.00 E120.00 ; set maximum instantaneous speed changes (mm/min)
    M203 X18000.00 Y18000.00 Z180.00 E1200.00 ; set maximum speeds (mm/min)
    M201 X500.00 Y500.00 Z20.00 E250.00 ; set accelerations (mm/s^2)
    M906 X700 Y700 Z600 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 X280 Y280 Z300 S0 ; set axis maxima

    ; Endstops
    M574 X1 S1 P"xstop" ; configure active-high endstop for low end on X via pin xstop
    M574 Y2 S1 P"ystop" ; configure active-high endstop for high end on Y via pin ystop
    M574 Z1 S2 ; configure Z-probe endstop for low end on Z

    ; Z-Probe
    M950 S0 C"exp.heater3" ; create servo pin 0 for BLTouch
    M558 P9 C"^zprobe.in" H3 F120 T6000 ; set Z probe type to bltouch and the dive height + speeds
    G31 P500 X0 Y0 Z2.5 ; 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 B4138 ; 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 B4138 ; 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
    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 S0 H1 T45 ; set fan 1 value. Thermostatic control is turned on

    ; Tools
    M563 P0 D0 H1 F0:1 ; 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
    M501 ; load saved parameters from non-volatile memory
    M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss



  • If I swap the fan from "fan1" to "fan2" then it works as expected. It seems that "fan1" is permanently outputting 24v no matter what I do to it.


  • Moderator

    @StevePS3 It could be that the fan1 Mosfet has failed open. Can you take a good, high resolution picture of your Duet, of the area around the fan1 connection? Looking for failed components.

    Ian



  • I've tried to but I keep getting "Something went wrong whilst processing server response"




  • Moderator

    @StevePS3 said in Extruder fan permanently spinning:

    I've tried to but I keep getting "Something went wrong whilst processing server response"

    What browser are you using? I think this happens sometimes with Chrome.

    I can't see anything obviously wrong with the MOSFET.

    Ian



  • Ahh yes, Chrome.
    No, they looked OK to me.


  • Moderator

    @StevePS3 said in Extruder fan permanently spinning:

    ; 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 S0 H1 T45 ; set fan 1 value. Thermostatic control is turned on
    ; Tools
    M563 P0 D0 H1 F0:1 ; define tool 0

    Where do you have your fans actually connected?

    Your tool has defined fan0 and fan1 as the tool fan. If fan1 is the hotend heatsink fan, then you don't want fan1 assigned to the tool as well.

    Change M563 P0 D0 H1 F0:1 to be M563 P0 D0 H1 F0


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