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    Can't stop my heated bed and extruder

    Scheduled Pinned Locked Moved
    Duet Hardware and wiring
    thermal runaway
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    • TheBigKentundefined
      TheBigKent
      last edited by

      Hello all, I'm new to the Duet3D community. I was setting up my new Duet WiFi board today and everything was going great, my CoreXY printer was homing properly and my dual z axis were working together. Then on my last few reboots I saw that my heated components were coming on. I tried setting the active temperatures to zero, I tried rebooting a few times, even tried setting the temperatures with manual g-code. I will note that my heated bed is driven through a mosfet board.

      What can I do to stop it? I tried googling but I didn't see anything or anyone having my issues.

      Thanks,
      Kent

      ; Configuration file for Duet WiFi (firmware version 1.21)
      ; executed by the firmware on start-up
      ;
      ; generated by RepRapFirmware Configuration Tool on Sat Aug 18 2018 11:19:22 GMT-0500 (Central Daylight Time)

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

      M667 S1 ; Select CoreXY mode

      ; Network
      M550 PX5S ; Set machine name
      M552 S1 ; Enable network
      ;*** Access point is configured manually via M587
      M586 P0 S1 ; Enable HTTP
      M586 P1 S0 ; Disable FTP
      M586 P2 S0 ; Disable Telnet

      ; Where I put stuff in
      M584 X0 Y1 Z2:3 U3 E4 ; Driver 0 For X, 1 for Y, Z=2:3 U=3, Extruder 4

      ; Drives
      M569 P0 S0 ; Drive 0 goes forwards
      M569 P1 S0 ; Drive 1 goes forwards
      M569 P2 S1 ; Drive 2 goes forwards
      M569 P3 S1 ; Drive 3 goes forwards
      M569 P4 S1 ; Drive 4 goes forwards
      M350 X16 Y16 Z16:16 U16 E16 I1 ; Configure microstepping with interpolation
      M92 X80 Y80 Z1600:1600 U1600 E420 ; Set steps per mm
      M566 X900 Y900 Z12:12 U12 E120 ; Set maximum instantaneous speed changes (mm/min)
      M203 X6000 Y6000 Z180:180 U180 E1200 ; Set maximum speeds (mm/min)
      M201 X500 Y20 Z250:250 U:250 E250 ; Set accelerations (mm/s^2)
      M906 X2000 Y2000 Z2000:2000 U2000 E800 I50 ; Set motor currents (mA) and motor idle factor in per cent
      M84 S30 ; Set idle timeout

      ; Axis Limits
      M208 X0 Y0 Z0:0 U0 S1 ; Set axis minima
      M208 X330 Y330 Z400:400 U400 S0 ; Set axis maxima

      ; Endstops
      M574 X1 S0 ; Set active low endstops
      M574 Y1 Z1 U1 S1 ; Set active high endstops

      ; Filament run out
      M591 D1 P1 C4 S1

      ; Z-Probe
      M558 P0 H5 F120 T6000 ; Disable Z probe but set dive height, probe speed and travel speed
      M557 X15:315 Y15:315 S20 ; 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 C0 R4700 ; Set thermistor + ADC parameters for heater 0
      M143 H0 S120 ; Set temperature limit for heater 0 to 120C
      M305 P1 T100000 B4725 C7.060000e-8 R4700 ; Set thermistor + ADC parameters for heater 1
      M143 H1 S280 ; Set temperature limit for heater 1 to 280C

      ; Fans
      M106 P0 S0.3 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
      M106 P1 S1 I0 F500 H1 T45 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
      M106 P2 S1 I0 F500 H1 T45 ; Set fan 2 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

      wilrikerundefined 1 Reply Last reply Reply Quote 0
      • TheBigKentundefined
        TheBigKent
        last edited by

        Including a screen shot of the web interface
        0_1534616688135_overheating.PNG

        1 Reply Last reply Reply Quote 0
        • wilrikerundefined
          wilriker @TheBigKent
          last edited by

          @thebigkent Regarding the bed driven through MOSFET board: they can fail shorted so it the bed will be on all the time. Do you have a spare MOSFET board to check against? Also why don't you use the Duet's terminals? They are rated for 18A. Does your bed exceed this?

          As for why the hotend is doing the same thing, I have to pass the question on. But it might of course be the same thing with Duet's on-board MOSFET for the hotend heater terminals.

          Manuel
          Duet 3 6HC (v0.6) with RPi 4B on a custom Cartesian
          with probably always latest firmware/DWC (incl. betas or self-compiled)
          My Tool Collection

          TheBigKentundefined 1 Reply Last reply Reply Quote 0
          • TheBigKentundefined
            TheBigKent @wilriker
            last edited by TheBigKent

            @wilriker said in Can't stop my heated bed and extruder:

            @thebigkent Regarding the bed driven through MOSFET board: they can fail shorted so it the bed will be on all the time. Do you have a spare MOSFET board to check against? Also why don't you use the Duet's terminals? They are rated for 18A. Does your bed exceed this?

            As for why the hotend is doing the same thing, I have to pass the question on. But it might of course be the same thing with Duet's on-board MOSFET for the hotend heater terminals.

            The bed current isn't excessive but it's a 24V bed while the rest of my printer is running off of 12V. I'll try removing the mosfet board and seeing if that helps.

            Edit: Nope, the bed does heat much slower but I'm still uncontrollably heating.

            wilrikerundefined 1 Reply Last reply Reply Quote 0
            • wilrikerundefined
              wilriker @TheBigKent
              last edited by wilriker

              @thebigkent said in Can't stop my heated bed and extruder:

              The bed current isn't excessive but it's a 24V bed while the rest of my printer is running off of 12V. I'll try removing the mosfet board and seeing if that helps.

              OK, in that case it would not make any sense to connect it directly to the Duet, I see. Still the MOSFET could have failed shorted. In this case also the MOSFET used on the Duet to control the bed that you again use to control your external MOSFET board could have shorted and therefore commanding your external MOSFET board to be on all the time.
              You could probably check this using a multimeter across Duet's bed terminals.

              1. If they show voltage although not explicitly heating then you most probably have a short on the board.
              2. If they don't and your bed still heats (did you touch the bed to check if it is actually hot and not your sensors are going haywire?) it probably is your external MOSFET board.

              Manuel
              Duet 3 6HC (v0.6) with RPi 4B on a custom Cartesian
              with probably always latest firmware/DWC (incl. betas or self-compiled)
              My Tool Collection

              TheBigKentundefined 1 Reply Last reply Reply Quote 0
              • TheBigKentundefined
                TheBigKent @wilriker
                last edited by

                @wilriker said in Can't stop my heated bed and extruder:

                @thebigkent said in Can't stop my heated bed and extruder:

                The bed current isn't excessive but it's a 24V bed while the rest of my printer is running off of 12V. I'll try removing the mosfet board and seeing if that helps.

                OK, in that case it would not make any sense to connect it directly to the Duet, I see. Still the MOSFET could have failed shorted. In this case also the MOSFET used on the Duet to control the bed that you again use to control your external MOSFET board could have shorted and therefore commanding your external MOSFET board to be on all the time.
                You could probably check this using a multimeter across Duet's bed terminals.

                1. If they show voltage although not explicitly heating then you most probably have a short on the board.
                2. If they don't and your bed still heats (did you touch the bed to check if it is actually hot and not your sensors are going haywire?) it probably is your external MOSFET board.

                No, my first clue was the LED lighting up on my heated bed indicating that it was heating. I did double check and things were getting hot. I've managed to get it working but it's not an ideal scenario, I switched the jumper from internal 5v+ to external and am powering the board via the USB plug. I'm well on my way to my first duet powered print.

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

                  If all the heaters turn on when you use the internal 5V regulator but not when you use external 5V power, then your Duet is faulty. Please do not use it (even with external 5V power), instead ask for it to be replaced under warranty.

                  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

                  TheBigKentundefined 1 Reply Last reply Reply Quote 0
                  • TheBigKentundefined
                    TheBigKent @dc42
                    last edited by

                    @dc42 Okay, will do.

                    1 Reply Last reply Reply Quote 0
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