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    Duet 2 Wifi Overkill Active Cooling

    Tuning and tweaking
    cooling
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    • mihaitintea
      mihaitintea last edited by

      Hello

      I' ve seen educated advices here from the Creators of the Duet 2 Wifi about blowing a fan to the back of the board.

      May I ask please what would happen if I mount the board horizontally between two 120 mm fans, one of the fans blowing towards the back of the board and the other fan blowing towards the front of the board, thus the heated air being evacuated laterally.

      0_1558116722146_Untitled.jpg

      Thanks and regards
      Mihai

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

        You will get a dead zone with little cooling, approximately in line with the centre of the fans.

        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

        zapta 1 Reply Last reply Reply Quote 1
        • c310
          c310 last edited by

          why do you need that? what is the real reason?
          40-50 mm side fan will do the job, but if the duet board is not under the headbed, you do not need the fan at all...

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

            A related question, how can I tell if the DWF has sufficient cooling or needs more? Are there 'reasonable' temperatures for the critical components?

            (I do have access to an IR camera.)

            1 Reply Last reply Reply Quote 0
            • JRDM
              JRDM last edited by JRDM

              I use 2.4A on four different motors without issue using this plate and a small blower fan. I think even this plate might be overkill but at least it's easier to access the board as needed.

              https://www.thingiverse.com/thing:3504211

              A fan over the top side has a major disadvantage of restricting access to the board in case of needing to adjust any connector or cables.

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              • zapta
                zapta last edited by

                @jrdm, very nice design. Did you measure temperatures before and after?

                JRDM 1 Reply Last reply Reply Quote 0
                • JRDM
                  JRDM @zapta last edited by

                  @zapta Sorry, no I haven't. I did do a few tests to make sure the air flowed consistently but no thermal tests.

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                  • DocTrucker
                    DocTrucker last edited by

                    The drivers have active thermal protection. If you are running high current and the steppers stop or miss steps unexpectedly add more cooling.

                    The passive cooling is good though.

                    Alive: 1 Ormerodish machines. 1 Custom Cantilever. 3 P3Steel. 1 Ciclopish scanner. In build: 1 P3Steel. Controllers: 2 Duet 2 , 2 D0.6, 1 D0.8.5, 1 D3 v0.5, 1 RAMPS/DRV8825, 1 Uno/Scan Card.

                    zapta 1 Reply Last reply Reply Quote 0
                    • zapta
                      zapta @DocTrucker last edited by

                      @doctrucker said in Duet 2 Wifi Overkill Active Cooling:

                      The drivers have active thermal protection

                      They also have advanced warning when the silicon reaches ~100C (actual shutdown is about 50C higher at the silicon). I am not sure what the Duet's firmware does with this warning but it is discussed in M305 https://duet3d.dozuki.com/Wiki/Gcode#Section_M305_Set_temperature_sensor_parameters

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                      • JRDM
                        JRDM last edited by

                        @zapta said in Duet 2 Wifi Overkill Active Cooling:

                        @doctrucker said in Duet 2 Wifi Overkill Active Cooling:

                        The drivers have active thermal protection

                        They also have advanced warning when the silicon reaches ~100C (actual shutdown is about 50C higher at the silicon). I am not sure what the Duet's firmware does with this warning but it is discussed in M305 https://duet3d.dozuki.com/Wiki/Gcode#Section_M305_Set_temperature_sensor_parameters

                        I didn't set that up because it didn't seem like a good way to go.

                        On his force cancelling printer, Ian Deckingman used spare thermistor channels to read a thermistor potted to a representative driver chip and some motors to watch their temperatures.

                        DocTrucker 1 Reply Last reply Reply Quote 0
                        • DocTrucker
                          DocTrucker @JRDM last edited by

                          @jrdm That is on the motors, not the stepper drivers. With lower current stepper motors you can overheat the motors long before the stepper drvivers are struggling.

                          Alive: 1 Ormerodish machines. 1 Custom Cantilever. 3 P3Steel. 1 Ciclopish scanner. In build: 1 P3Steel. Controllers: 2 Duet 2 , 2 D0.6, 1 D0.8.5, 1 D3 v0.5, 1 RAMPS/DRV8825, 1 Uno/Scan Card.

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

                            @doctrucker said in Duet 2 Wifi Overkill Active Cooling:

                            @jrdm That is on the motors, not the stepper drivers. With lower current stepper motors you can overheat the motors long before the stepper drvivers are struggling.

                            Wes,
                            I put a thermistor on one of the driver chips too. That's what I use to control the fan that blows air onto the back of the board. These are set thermostatically to start at 40 Deg C.

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

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

                              @deckingman I stand corrected! 🙂

                              Alive: 1 Ormerodish machines. 1 Custom Cantilever. 3 P3Steel. 1 Ciclopish scanner. In build: 1 P3Steel. Controllers: 2 Duet 2 , 2 D0.6, 1 D0.8.5, 1 D3 v0.5, 1 RAMPS/DRV8825, 1 Uno/Scan Card.

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