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    Trouble powering part cooling fan

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    • totalitarianundefined
      totalitarian
      last edited by

      Hi,

      My part cooling fan decided to blow itself to bits last night. I thought it would be simple to swap it for a new but for some reason it won't power up.

      I quick meter reading says I am getting 24v out of the pins on startup of the duet. Shouldn't it read 24v?

      Phaedruxundefined 1 Reply Last reply Reply Quote 0
      • Phaedruxundefined
        Phaedrux Moderator @totalitarian
        last edited by

        @totalitarian which pins are you measuring?

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

        Z-Bot CoreXY Build | Thingiverse Profile

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        • totalitarianundefined
          totalitarian
          last edited by totalitarian

          I'm measuring the 2 pins on fan2

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          • Phaedruxundefined
            Phaedrux Moderator
            last edited by

            By default Fan 0 is the part cooling fan. Did you have Fan 2 configured to work as the tool fan before?

            I'm confused by your first post. You said you are getting 24v, is that not what you'd expect?

            Z-Bot CoreXY Build | Thingiverse Profile

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            • totalitarianundefined
              totalitarian
              last edited by

              My config should be good to go as the only thing that has changed is that I have fitted a new fan.

              I wouldn't expect 24v until I send the gcode to turn the fan on. Or is that assumption incorrect?

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              • Phaedruxundefined
                Phaedrux Moderator
                last edited by

                Can you post your config?

                How did the fan blow up?

                If your config is correct the problem is beyond me. Sorry.

                I think you may have a shorted fan header?

                Z-Bot CoreXY Build | Thingiverse Profile

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                • totalitarianundefined
                  totalitarian
                  last edited by

                  I'm away from my printer at the moment but the config is fine as i've been printing for the last 6 months on the same config.

                  Judging by the way the fan exploded, I can only assume a fault with the blades or a jam. I wasn't around when it happened.

                  I guess my questions are:

                  a) how do I measure the board to ensure it's not shorted
                  b) how can I test if the replacement fan is also faulty

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                  • SnowCrashundefined
                    SnowCrash
                    last edited by

                    Hi @totalitarian,

                    Just thought I'd chime in and note that to the best of my knowledge the power control of the fan connectors on the Duet is done by toggling the ground pins rather than the VCC pins.

                    So assuming you are indeed measuring the 2 pins on the connector itself (VCC & GND) - and not taking GND from somewhere else when measuring the voltage on the VCC pin - then it sounds to me that @Phaedrux's guess about a shorted fan header is the most likely explanation (it would also explain why the previous fan failed).

                    To check if there's a short or not in the fan header, completely disconnect the board from the power supply and switch your multimeter to measuring the minimal amount of resistance it can. Then touch the 2 fan connector pins with the 2 multimeter probes. The reading ought to be '1' meaning 'open circuit' . On the other hand, if you get any positive value when reading the resistance, then there's a short.

                    To test the fan itself, you can connect it to a separate power supply with the correct voltage. Alternatively, you can also connect it to one of the two 'always on' fan connectors on the Duet and see if it runs as expected.

                    Hope this helps.

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                    • totalitarianundefined
                      totalitarian
                      last edited by

                      Ok the fan works perfectly fine when connected to the always on pins. When I measure the reading on fan 2 pins, it stays at 1 as suggested. I guess that means there is no short?

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                      • totalitarianundefined
                        totalitarian
                        last edited by totalitarian

                        Is it possible to use one of the always on fans as a part cooling fan? Basically fan0 & fan2 appear to be dead.

                        OR

                        I don't know how to turn them on via gcode...

                        T3P3Tonyundefined 1 Reply Last reply Reply Quote 0
                        • Phaedruxundefined
                          Phaedrux Moderator
                          last edited by

                          It would help to know how you have them configured in config.g

                          Z-Bot CoreXY Build | Thingiverse Profile

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                          • totalitarianundefined
                            totalitarian
                            last edited by totalitarian

                            Here you go

                            E; Configuration file for Duet WiFi (firmware version 1.20 or newer)
                            ; executed by the firmware on start-up
                            ;
                            ; generated by RepRapFirmware Configuration Tool on Sun Dec 17 2017 21:18:18 GMT+0000 (GMT Standard Time)

                            M551 Pv1deoworld ; machine password
                            ; General preferences
                            M111 S0 ; Debugging off
                            G21 ; Work in millimetres
                            G90 ; Send absolute coordinates...
                            M83 ; ...but relative extruder moves
                            M555 P2 ; Set firmware compatibility to look like Marlin
                            ; Automatic saving after power loss is not enabled

                            M667 S1 ; Select CoreXY mode
                            M208 X0 Y0 Z0 S1 ; Set axis minima
                            M208 X300 Y275 Z300 S0 ; Set axis maxima

                            ; Endstops
                            M574 X1 Y2 Z1 S0 ; Set active high endstops
                            M558 P0 H5 F600 T6000 ; Set Z probe type to switch and the dive height + speeds
                            G31 P600 X0 Y0 Z2.5 ; Set Z probe trigger value, offset and trigger height
                            M557 X15:285 Y15:270 S20 ; Define mesh grid

                            ; Drives
                            M569 P0 S1 ; Drive 0 goes forwards
                            ;M569 P1 S0 ; Drive 1 goes forwards
                            M569 P2 S0 ; Drive 2 goes forwards
                            M569 P3 S0 ; Drive 3 goes forwards
                            M569 P4 S1 ; Drive 4 goes forwards
                            M584 X4 Y1 Z2 E3
                            M350 X16 Y16 I1; Configure microstepping with interpolation
                            M350 Z16 E16 I1 ; Configure microstepping without interpolation
                            M92 X80.203 Y80.203 Z1122.854 E412 ; Set steps per mm
                            M566 X330 Y330 Z90 E1500 ; Set maximum instantaneous speed changes (mm/min)
                            M203 X12000 Y12000 Z600 E4000 ; Set maximum speeds (mm/min)
                            ;M203 X20000 Y20000 Z600 E4000 ; Set maximum speeds (mm/min)
                            M201 X800 Y800 Z15 E3000 ; Set max accelerations (mm/s^2)
                            M906 X1200 Y1200 Z1200 E960 I30 ; Set motor currents (mA) and motor idle factor in per cent
                            M84 S30 ; Set idle timeout

                            ; Heaters
                            ;bed
                            M307 H0 A141.2 C597.9 D0.7 S1.00 V24.4 B0
                            M305 P0 T100000 B4725 R4700 ; Set thermistor + ADC parameters for heater 0
                            M143 H0 S120 ; Set temperature limit for heater 0 to 120C
                            ;hotend
                            ;M305 P1 T100000 B4725 C7.06e-8 R4700 ; Set thermistor + ADC parameters for heater 1
                            M305 P1 X200
                            M143 H1 S280 ; Set temperature limit for heater 1 to 280C
                            M307 H1 A390.0 C198.6 D10.5 S1.00 V24.4 B0

                            ; Tools
                            M563 P0 D0 H1 F2; 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

                            ; Network
                            M550 Gecko ; Set machine name
                            M552 S1 ; Enable network
                            M587 S"xxx" P"xxx" ; Configure access point. You can delete this line once connected
                            M586 P0 S1 ; Enable HTTP
                            M586 P1 S1 ; Enable FTP
                            M586 P2 S1 ; Enable Telnet

                            ; 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 T45 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
                            M106 P2 S0 I0 F500 H-1 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned off

                            ; Custom settings are not configured

                            ; Miscellaneous
                            T0 ; Select first tool

                            ;BLTouch
                            M307 H3 A-1 C-1 D-1 ;
                            M558 P5 X0 Y0 Z1 H5 F120 T2000; F probe speed - T Travel speed
                            G31 X37 Y0 Z1.1 P5
                            ;INCREASE VALUE WILL LOWER NOZZLE CLOSER TO THE BED, DECREASE THIS VALUE WILL RAISE THE NOZZLE FROM THE BED
                            M557 X37:263 Y37:263 S75.3 ; probe from X=30 to 270, Y=30 to 270mm with a mesh spacing of 80mm

                            ;Allow moving of axis without the need to home
                            M564 H0

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                            • T3P3Tonyundefined
                              T3P3Tony administrators @totalitarian
                              last edited by

                              @totalitarian the always on pins are hard wired into the power so they run all the time at fullmpower so not necessarily appropriate for part cooling. They can be fine for hotend cooling if you are happy to have the hotend cooling fan on all the time.

                              www.duet3d.com

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                              • totalitarianundefined
                                totalitarian
                                last edited by

                                I think that is the way I have to go. Always on for the hotend fan and fan 1 for part cooling

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

                                  @totalitarian said in Trouble powering part cooling fan:

                                  I think that is the way I have to go. Always on for the hotend fan and fan 1 for part cooling

                                  Either that, or get the blown fan mosfets replaced.

                                  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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