Filament cooling fans are not working.



  • So, I fitted new blower fans 24v for cooling the filament and they don’t work. The old one was working. As I connected them, I tried each one and they worked. Then wire them together and in and not working. It gets weirder. If I measure the voltage going to the fans without the fans in circuit, I have 23-24 Volts. The moment I connect them it drops to 4-5volts. I’ve tried to send a command to the fans to run at full but no joy. Even connecting them separately doesn’t work. They are the correct blower fans in case you were wondering. Any ideas guys? I’ve spent a whole day trying. I then put them onto the all ways on fan jumper and they work. I then connected the blower fans to the hot end fan jumper (which was running) and still no joy. Worse the hot end fan now runs slowly as in only 5v coming out of that jumper. So now both fans are not working. Is there a fuse or have I cooked something??



  • Silly things first, as I have to double check myself sometimes! 🕵
    Have you wired them in series or parallel - and the polarity is correct?

    Please post your config.g, which I am sure is also correct...... and a M122



  • Yip they are connected in parallel, and the polarity is ok.
    I then put them onto the all ways on fan jumper and they work. I then connected decided to connect them to the hot end fan jumper (which was running) and still no joy. Worse when putting the hot end jumper back, the hot end fan now runs slowly as in only 5v coming out of that jumper. So now both fans are not working. Is there a fuse or have I cooked something??



  • 2:57:28 PM
    M122
    === Diagnostics ===
    RepRapFirmware for Duet 2 WiFi/Ethernet version 2.03RC4 running on Duet WiFi 1.02 or later
    Board ID: 08DGM-917NK-F23T0-6J1DA-3S86T-KZBWD
    Used output buffers: 3 of 24 (17 max)
    === RTOS ===
    Static ram: 25680
    Dynamic ram: 93740 of which 0 recycled
    Exception stack ram used: 312
    Never used ram: 11340
    Tasks: NETWORK(ready,660) HEAT(blocked,1236) MAIN(running,3756) IDLE(ready,160)
    Owned mutexes:
    === Platform ===
    Last reset 00:10:35 ago, cause: power up
    Last software reset at 2019-08-17 10:32, reason: User, spinning module GCodes, available RAM 11340 bytes (slot 0)
    Software reset code 0x0003 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x0441f000 BFAR 0xe000ed38 SP 0xffffffff Task 0x4e49414d
    Error status: 0
    Free file entries: 10
    SD card 0 detected, interface speed: 20.0MBytes/sec
    SD card longest block write time: 0.0ms, max retries 0
    MCU temperature: min 33.3, current 33.5, max 33.7
    Supply voltage: min 24.1, current 24.2, max 24.2, under voltage events: 0, over voltage events: 0, power good: yes
    Driver 0: standstill, SG min/max not available
    Driver 1: standstill, SG min/max not available
    Driver 2: standstill, SG min/max not available
    Driver 3: standstill, SG min/max not available
    Driver 4: standstill, SG min/max not available
    Date/time: 2019-08-17 12:57:27
    Cache data hit count 2517756468
    Slowest loop: 1.13ms; fastest: 0.08ms
    I2C nak errors 0, send timeouts 0, receive timeouts 0, finishTimeouts 0, resets 0
    === Move ===
    Hiccups: 0, FreeDm: 169, MinFreeDm: 169, MaxWait: 0ms
    Bed compensation in use: none, comp offset 0.000
    === DDARing ===
    Scheduled moves: 0, completed moves: 0, StepErrors: 0, LaErrors: 0, Underruns: 0, 0
    === Heat ===
    Bed heaters = 0 -1 -1 -1, chamberHeaters = -1 -1
    === GCodes ===
    Segments left: 0
    Stack records: 2 allocated, 0 in use
    Movement lock held by null
    http is idle in state(s) 0
    telnet is idle in state(s) 0
    file is idle in state(s) 0
    serial is idle in state(s) 0
    aux is idle in state(s) 0
    daemon is idle in state(s) 0
    queue is idle in state(s) 0
    autopause is idle in state(s) 0
    Code queue is empty.
    === Network ===
    Slowest loop: 202.15ms; fastest: 0.08ms
    Responder states: HTTP(0) HTTP(0) HTTP(0) HTTP(0) FTP(0) Telnet(0) Telnet(0)
    HTTP sessions: 1 of 8

    • WiFi -
      Network state is running
      WiFi module is connected to access point
      Failed messages: pending 0, notready 0, noresp 1
      WiFi firmware version 1.23
      WiFi MAC address bc:dd:c2:89:9e:98
      WiFi Vcc 3.35, reset reason Turned on by main processor
      WiFi flash size 4194304, free heap 24360
      WiFi IP address 192.168.0.164
      WiFi signal strength -56dBm, reconnections 0, sleep mode modem
      Socket states: 0 0 0 0 0 0 0 0


  • ; Configuration file for Duet WiFi (firmware version 1.21)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool on Mon Dec 24 2018 18:36:17 GMT+0200 (South Africa Standard Time)

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

    ; Network
    ; M550 P"TEVO BLACK WIDOW"
    M550 P"PETERS TEVO BLACK WIDOW" ; Set machine name
    M552 S1 ; Enable network
    ;M587 S"Tech5_753CE0_EXT" P"landeach108" ; Configure access point. You can delete this line once connected
    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 S0 ; Drive 1 goes backwards
    M569 P2 S0 ; Drive 2 goes backwards
    M569 P3 S1 ; Drive 3 goes forwards
    M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
    M92 X80 Y80 Z1600 E448 ; Set steps per mm
    M566 X700 Y700 Z12 E10 ; Set maximum instantaneous speed changes (mm/min)
    M203 X2000 Y2000 Z500 E1200 ; Set maximum speeds (mm/min)
    M201 X500 Y500 Z300 E200 ; Set accelerations (mm/s^2)
    M906 X1050 Y1050 Z1000 E1050 I30 ; Set motor currents (mA) and motor idle factor in per cent
    M84 S10 ; Set idle timeout

    ; Axis Limits
    M208 X0 Y0 Z0 S1 ; Set axis minima
    M208 X335 Y250 Z270 S0 ; Set axis maxima

    ; Endstops
    M574 X1 Y1 Z1 S0 ; Set active low endstops

    ; Z-Probe
    M558 P0 H5 F120 T6000 ; Disable Z probe but set dive height, probe speed and travel speed
    M557 X0:335 Y0:240 S20 ; Define mesh grid

    ;Piezo settings
    ;M558 P5 I1 R0.4 F300 X0 Y0 Z0
    ;G31 X0 Y0 Z-0.1 P500

    ; Heaters
    M307 H1 S1.00 P10.7, I0.398, D45.9 B0 S1.00 ; USE PID ON NOZZLE
    M305 P0 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 0
    M143 H0 S110 ; Set temperature limit for heater 0 to 110C
    M305 P1 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 1
    M143 H1 S270 ; Set temperature limit for heater 1 to 270C

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

    ; Tools
    M563 P0 D0 H1 S"Extruder" ; 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 S21.0 R23.0 P"M913 X0 Y0 G91 M83 G1 Z0 E-5 F1000" ; Set voltage thresholds and actions to run on power loss
    M501
    ; Custom settings are not configured



  • even re-soldered the wiring in case 😞



  • The F parameter could be playing silly.... for your M106
    Try different F parameters

    This may guide you more...
    https://duet3d.dozuki.com/Wiki/Gcode#Section_M106_Fan_On

    HTH Paul.



  • Thank YOU I'm on the right track. OK, so now they work?? But the hot end fan spins slowly. However its a 12v fan. (not sure why as the previous owner fitted that)



  • I set them to F250 as it says its the default. ??? Is there a better setting?



  • Sorry for all the questions and thanks for you help. ok so the fans work, except for PO , if I change jumpers they both work, is there a setting that sets the tool fan that could be overriding stuff?



  • Glad you are making progress!

    This is my line for P0
    M106 P0 S0 I0 F500 H-1

    Duet2's I think have a built in step down, not sure but might be worth checking the documentation in the wiki.

    If the previous owner fitted a 12v fan on a 24v output, 1) I am supried it is still working and 2) the possible reason you think your new fan is spinning slowly!

    If you connect the new 24v fans to 24v directly does it spin at the same speed as if it is connected to its correct connection. If you see what I mean!

    I am not that clued up on PWM like others, just basic fault finding.
    I think it will be a case of searching the forum or trying different settings for the F param.

    Regards,
    Paul.



  • Did the previous owner have a separate 12v supply connected to the VFan pin to provide the fans with 12v instead of 24v?

    https://duet3d.dozuki.com/Wiki/Connecting_and_configuring_fans



  • @paulhew said in Filament cooling fans are not working.:

    Duet2's I think have a built in step down,

    Duet 2 has step down to 5v and 3v3. (The Duex expansion boards, and the soon to be released Duet 3 will also have 12v step down for 12v fans when running off 24v)

    @petera said in Filament cooling fans are not working.:

    I set them to F250 as it says its the default. ??? Is there a better setting?

    If you intend to use the default parameter its probably better to not specify it in the config btw. For example, the duet 2 wifi and duet 2 maestro use a different R value in the thermistor config, but if its not specified the same thermistor config is valid for both boards as the firmware will apply the correct default value. Its also easier to read.



  • @paulhew
    Thanks I will be trying a few settings.



  • @phaedrux
    No he didn't. LOL



  • strange thing is that now the fans all work well on p1 & P2, but on p0 they spin slowly, the settings are as above in the config. Also when using the web interface a can turn them up or down but even on max any of the fans on the p0 jumper turn slowly, I have opted to run my hotend fan off the always on instead of P0, its not fixing the problem but until I figure it out.
    What happens if I push the rest button and start again I wonder? LOL



  • Could be the PWM value for the fan. F parameter
    Check this - https://duet3d.dozuki.com/Wiki/Gcode#Section_M106_Fan_On

    Another user had a similar issue the other day.


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