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    Turn on a fan automatically when a heater is activated?

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    • deckingmanundefined
      deckingman @pro3d
      last edited by

      @pro3d Or how about wire a small relay in parallel with the heater, connect the contacts to a spare io pin and use that to run a trigger macro which will turn on the fan. https://docs.duet3d.com/User_manual/Reference/Gcodes#m581-configure-external-trigger and https://docs.duet3d.com/en/User_manual/Tuning/Triggers

      Ian
      https://somei3deas.wordpress.com/
      https://www.youtube.com/@deckingman

      pro3dundefined 1 Reply Last reply Reply Quote 0
      • pro3dundefined
        pro3d @deckingman
        last edited by

        @deckingman said in Turn on a fan automatically when a heater is activated?:

        @pro3d Or how about wire a small relay in parallel with the heater, connect the contacts to a spare io pin and use that to run a trigger macro which will turn on the fan.

        Yeah I was hoping to solve this by firmware without to much workarounds. It would be nice to trigger the fan just by activating the heater by firmware. But maybe it's not straight forward as I thought

        Valkyrie DIY High Temp 3D Printer

        R&D - Engineering Designer - Viking 3D Printers
        https://vkingprinter.com/

        deckingmanundefined 1 Reply Last reply Reply Quote 0
        • deckingmanundefined
          deckingman @pro3d
          last edited by

          @pro3d Unfortunately triggers are only external via io pins. I agree that it would be good if any event could be a trigger. A kind of "If This Then That" approach.

          Ian
          https://somei3deas.wordpress.com/
          https://www.youtube.com/@deckingman

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          • fcwiltundefined
            fcwilt @pro3d
            last edited by

            @pro3d

            Does it have to come on immediately or could it be tied to temperature?

            You could have a temp sensor placed where appropriate and set up the fan to be tied to a threshold temp, like you would with a extruder fan.

            Frederick

            Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

            pro3dundefined 1 Reply Last reply Reply Quote 0
            • pro3dundefined
              pro3d @fcwilt
              last edited by

              @fcwilt said in Turn on a fan automatically when a heater is activated?:

              @pro3d

              Does it have to come on immediately or could it be tied to temperature?

              You could have a temp sensor placed where appropriate and set up the fan to be tied to a threshold temp, like you would with a extruder fan.

              Frederick

              It has to come immediately yes. As the Temp sensor is in the box, not on the heater

              Valkyrie DIY High Temp 3D Printer

              R&D - Engineering Designer - Viking 3D Printers
              https://vkingprinter.com/

              fcwiltundefined 1 Reply Last reply Reply Quote 0
              • fcwiltundefined
                fcwilt @pro3d
                last edited by

                @pro3d

                I was thinking of putting the temp sensor in the box.

                So what bad things would happen if it didn't come on until the temp sensor read some threshold temp?

                Thanks.

                Frederick

                Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

                pro3dundefined 1 Reply Last reply Reply Quote 0
                • pro3dundefined
                  pro3d @fcwilt
                  last edited by

                  @fcwilt said in Turn on a fan automatically when a heater is activated?:

                  @pro3d

                  I was thinking of putting the temp sensor in the box.

                  So what bad things would happen if it didn't come on until the temp sensor read some threshold temp?

                  Thanks.

                  Frederick

                  The sensor will not read more than ambient for a while and the heater will go wild and the fan shroud will creep/melt

                  Valkyrie DIY High Temp 3D Printer

                  R&D - Engineering Designer - Viking 3D Printers
                  https://vkingprinter.com/

                  fcwiltundefined 1 Reply Last reply Reply Quote 0
                  • fcwiltundefined
                    fcwilt @pro3d
                    last edited by

                    @pro3d

                    Well if you put the sensor where the heat is an issue and set the threshold to 30 it should turn on quite soon after the heat turns on.

                    Frederick

                    Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

                    pro3dundefined 1 Reply Last reply Reply Quote 0
                    • jens55undefined
                      jens55
                      last edited by

                      I have a similar issue that is still waiting for me to implement a solution. What I will be doing is to set up a time delay relay of some kind. Either a commercial relay or a standard relay with a simple 555 timer circuit (ie home-brew).
                      The fan turns on with the heater. The heater turning on sets/activates a relay that also provides power to the fan (so the fan is powered by the heater as well as through this relay). When the heater turns off, a timer starts while the secondary relay stays activated (and thus provides power to the fan). After a given time period (say 30 seconds) the timer drops out, the secondary relay releases and the cooling fan has no more power and stops.
                      Depending on how the fan is powered (high side switched or low side switched), the relay might be in the high side circuit or the low side circuit.
                      I have not yet looked to see if an off-the-shelf time delay relay can be had for cheap or if I should implement the timer function myself .... I would expect a commercial solution would be available from AliExpress at a reasonable cost.

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                      • pro3dundefined
                        pro3d @fcwilt
                        last edited by

                        @fcwilt said in Turn on a fan automatically when a heater is activated?:

                        @pro3d

                        Well if you put the sensor where the heat is an issue and set the threshold to 30 it should turn on quite soon after the heat turns on.

                        Frederick

                        This would not report box temp as being close to the heater temperature would be higher than chamber temp

                        Valkyrie DIY High Temp 3D Printer

                        R&D - Engineering Designer - Viking 3D Printers
                        https://vkingprinter.com/

                        fcwiltundefined 1 Reply Last reply Reply Quote 0
                        • fcwiltundefined
                          fcwilt @pro3d
                          last edited by

                          @pro3d said in Turn on a fan automatically when a heater is activated?:

                          This would not report box temp as being close to the heater temperature would be higher than chamber temp

                          I've gotten confused.

                          I thought the goal was to turn on the fan to protect the fan shroud.

                          So if the sensor is near the shroud would it not serve to protect the shroud by turning on the fan before the temp was high enough to be a problem?

                          Frederick

                          Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

                          pro3dundefined 1 Reply Last reply Reply Quote 0
                          • pro3dundefined
                            pro3d @fcwilt
                            last edited by

                            @fcwilt said in Turn on a fan automatically when a heater is activated?:

                            @pro3d said in Turn on a fan automatically when a heater is activated?:

                            This would not report box temp as being close to the heater temperature would be higher than chamber temp

                            I've gotten confused.

                            I thought the goal was to turn on the fan to protect the fan shroud.

                            So if the sensor is near the shroud would it not serve to protect the shroud by turning on the fan before the temp was high enough to be a problem?

                            Frederick

                            Yes but the sensor is supposed to monitor the chamber/box temp. Not the heater temperature, so the sensor need to be away from the heater....

                            Valkyrie DIY High Temp 3D Printer

                            R&D - Engineering Designer - Viking 3D Printers
                            https://vkingprinter.com/

                            engikeneerundefined 1 Reply Last reply Reply Quote 0
                            • engikeneerundefined
                              engikeneer @pro3d
                              last edited by

                              @pro3d he's meaning add a second sensor. The advantage of this method is that you actively know if the shroud is getting too hot, and you could even set up over temperature warning if it still got too hot with the fan on (or the fan fails!). It also gives you the delayed turn off in on, as itll stay on til the heater has cooled (which may be differentlengths depending on how longs its been on). To me, this is the 'safe' way to monitor this issue, though generally I prefer to avoid designing in potential thermal runaway events where possible.

                              The Daemon.g option is the firmware only approach you want. It is a script that repeatedly runs in the background, so you can use metacommands (I.e. the RRF built in programming language) to put whatever if/else/while/whatever blocks in to control your fan based off accessing machine data in the object model. You'll need to be on RRF3 and do some reading up on the meta commands which is all on the wiki.

                              E3D TC with D3Mini and Toolboards.
                              Home-built CoreXY, Duet Wifi, Chimera direct drive, 2x BMG, 300x300x300 build volume
                              i3 clone with a bunch of mods

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                              • pro3dundefined
                                pro3d
                                last edited by

                                @moth4017 managed to get this sorted out with the daemon.g file and some if, elif commands

                                Now the fan activate when heater turns on, and off when temp is below 35c

                                Valkyrie DIY High Temp 3D Printer

                                R&D - Engineering Designer - Viking 3D Printers
                                https://vkingprinter.com/

                                Exerqtorundefined 1 Reply Last reply Reply Quote 1
                                • Exerqtorundefined
                                  Exerqtor @pro3d
                                  last edited by

                                  @pro3d Totally beside the point and off subject, but what heater is it you're using?

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