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    Fans running only when tool is inactive

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    Duet Hardware and wiring
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    • pkirillundefined
      pkirill
      last edited by

      Possibly a stupid question, but I have a 24v system using an E3D V6 with it's stock 24v 30mm fan and a part fan that is a 24v 50mm blower. I'm having a problem where the fans only run when the hot end is inactive. When I power up the system, the hot-end fan runs 100% and the part fan is off - as expected. However, when I activate the hot-end, the hot-end fan immediately stops. This happen whether the hot-end fan is plugged into an always-on connection or in one of the controllable connections. Any ideas why this is happening and how to fix it would be greatly appreciated. Using a Duet2 Wifi, firmware 2.01, config code below...

      ; Configuration file for Duet WiFi (firmware version 1.21)
      ; executed by the firmware on start-up
      ;
      ; generated by RepRapFirmware Configuration Tool v2 on Sun Jun 09 2019 20:10:50 GMT-0400 (Eastern Daylight Time)

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

      ; Network
      M550 P"Duet A30" ; Set machine name
      M552 S1 ; Enable network
      M587 S"XXXX" P"1234567890" ; 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 ; Physical drive 0 goes forwards
      M569 P1 S1 ; Physical drive 1 goes forwards
      M569 P2 S1 ; Physical drive 2 goes forwards
      M569 P3 S0 ; Physical drive 3 goes backwards
      M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
      M92 X80.00 Y80.00 Z400.00 E415.00 ; Set steps per mm
      M566 X600.00 Y600.00 Z30.00 E600.00 ; Set maximum instantaneous speed changes (mm/min)
      M203 X9600.00 Y9600.00 Z1800.00 E3000.00 ; Set maximum speeds (mm/min)
      M201 X3000.00 Y3000.00 Z50.00 E2000.00 ; Set accelerations (mm/s^2)
      M906 X800.00 Y800.00 Z800.00 E800.00 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 X320 Y320 Z420 S0 ; Set axis maxima

      ; Endstops
      M574 X1 Y1 S1 ; Set active high endstops

      ; Z-Probe
      M574 Z1 S2 ; Set endstops controlled by probe
      M307 H4 A-1 C-1 D-1 ; Disable heater on PWM channel for BLTouch
      M558 P9 H5 F120 T6000 ; Set Z probe type to bltouch and the dive height + speeds
      G31 P500 X48 Y-2 Z1.75 ; Set Z probe trigger value, offset and trigger height
      M557 X20:300 Y20:300 S40 ; Define mesh grid

      ; Heaters
      M307 H0 B0 S1.00 ; Disable bang-bang mode for the bed heater and set PWM limit
      M305 P0 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 0
      M143 H0 S120 ; Set temperature limit for heater 0 to 120C
      M305 P1 T10000 B1504 C7.060000e-8 R4700 ; Set thermistor + ADC parameters for heater 1
      M143 H1 S285 ; Set temperature limit for heater 1 to 285C

      ; Fans
      M106 P0 S0 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
      M106 P1 S1 I0 F500 H1 T100 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on

      ; Tools
      M563 P0 D0 H1 ; 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 saving after power loss is not enabled

      ; Custom settings are not configured

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      • dc42undefined
        dc42 administrators
        last edited by dc42

        Are both the red and black wires form the the fans connected directly to the fan outputs? You would get that symptom if you shared the positive wire ot the extruder heater with the positive wires to the fans, but you picked the wrong heater wire to share.

        Duet WiFi hardware designer and firmware engineer
        Please do not ask me for Duet support via PM or email, use the forum
        http://www.escher3d.com, https://miscsolutions.wordpress.com

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        • pkirillundefined
          pkirill
          last edited by

          I know the hot-end fan is using both ground and power directly. The part fan may be sharing power in that I’m using the pcb connection board from the Geeetech A30 and it shares for the part fan. I’ll try bypassing the pcb completely and see how that does. Appreciate the response!

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          • pkirillundefined
            pkirill
            last edited by

            Okay, so I've run wires directly from the fans to the board. When I connect a fan to the "always on" it runs. When I connect a second fan to the second always on and turn on the power, the fuse blows. If I have one fan on the always on and one one a PWM connection, the always on runs, the PWM is idle, and when I make the hot end active and set a temp, the fuse blows. I've tried multiple fans in multiple configurations so I'm pretty positive it's not the fans or the connection wiring. Have I damaged the board somehow? Any thought would be greatly appreciated!

            dc42undefined 1 Reply Last reply Reply Quote 0
            • dc42undefined
              dc42 administrators @pkirill
              last edited by

              @pkirill said in Fans running only when tool is inactive:

              When I connect a second fan to the second always on and turn on the power, the fuse blows.

              Do you have the red and black wires the right way round? If you do then that second fan is probably faulty. I am assuming that they are not very powerful fans such that the combined total load is well over 1A.

              Duet WiFi hardware designer and firmware engineer
              Please do not ask me for Duet support via PM or email, use the forum
              http://www.escher3d.com, https://miscsolutions.wordpress.com

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