Extruder fan permanently spinning

StevePS3 · 12 Aug 2020, 11:45

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

StevePS3 · 12 Aug 2020, 12:13

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.

droftarts · 12 Aug 2020, 13:08

@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

StevePS3 · 12 Aug 2020, 15:15

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

StevePS3 · 12 Aug 2020, 15:18

https://1drv.ms/u/s!At_9PCgHtKl3nnqmzL4cfrI6LOmi

droftarts · 12 Aug 2020, 15:27

@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

StevePS3 · 12 Aug 2020, 15:29

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

Phaedrux · 12 Aug 2020, 18:04

@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