Why layer fans are on when power on printer



  • Hi,

    i have a menor issue, layer fans are on with power on printer. Why can be this... i'd like that layer fans are off until print reach the layer in slicer when have to go power on...

    why?



  • I have started with a fresh config for my new printer and the web-configurator had set the fan0 to 0.3 for me on boot:
    M106 P0 S0.3 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off

    I changed the S parameter value to 0.0 to have my layer fan off after powering on the printer
    M106 P0 S0.0 I0 F500 H-1


  • administrators

    Please tell us which fan output(s) you have your layer fan(s) connected to, and post your config.g file.



  • Hi,

    ; Fans
    M106 P0 H-1 ; GCODE FAN
    M106 P1 H-1 ; GCODE FAN
    M106 P2 S1 I0 F500 H1 T150 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on a 150C


  • administrators

    Fan 1 is configured by default to be used as a thermostatic fan for cooling the extruder heatsink. So it is on and in thermostatic mode at startup. Your M106 P1 H1 command cancels thermostatic mode, but if you want to turn it off you should add S0 to that command.



  • Ok,

    FAN1=P1, No?

    I too, can change connection shocket. Can connect Extruder heatskin Fan, to P1, and layer fan to P0 or P2, and change "config.g", to something similar to this:

    ; Fans
    M106 P0 H-1 ; GCODE FAN
    M106 P1 S1 I0 F500 H1 T150
    M106 P2 H-1 ; GCODE FAN


  • administrators

    @peirof said in Why layer fans are on when power on printer:

    Ok,

    FAN1=P1, No?

    I too, can change connection shocket. Can connect Extruder heatskin Fan, to P1, and layer fan to P0 or P2, and change "config.g", to something similar to this:

    ; Fans
    M106 P0 H-1 ; GCODE FAN
    M106 P1 S1 I0 F500 H1 T150
    M106 P2 H-1 ; GCODE FAN

    Yes, that's more like what we intended. The reason we did this is that if you upload new firmware while the hot end is hot (as I often do), and something goes wrong, fan 1 will still be running to cool the heatsink and prevent a hot end jam.


 

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