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    Heating issues

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    • djthumaundefined
      djthuma
      last edited by

      I have a new printer setup that has been retrofit with a duet 2 wifi, pt100 temp sensor and pt100 daughterboard, mosquito magnum hotend.

      I have it all connected and configured to power both heaters. They do power on and begin heating. But I get an error that says they did not reach temperature or did not heat fast enough.

      I cannot use the PID tuning because they don't reach the desired temperature.

      What can I do to properly set the PID or temp for tuning?

      Thanks

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      • Phaedruxundefined
        Phaedrux Moderator
        last edited by

        What prevents the hotend from reaching the desired temp during tuning? Is it just too slow?

        https://docs.duet3d.com/en/User_manual/Connecting_hardware/Heaters_tuning

        See here, especially the troubleshooting section. You may be able to increase the deadtime to allow the tune to complete.

        Z-Bot CoreXY Build | Thingiverse Profile

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        • djthumaundefined
          djthuma
          last edited by

          The biggest issue before with the heaters was the supply voltage being too low.

          I now have a power supply for this retrofit that has 24V.

          Heaters can now be tuned and reach the desired temperature.

          Running some test prints for microstep tuning, but I am receiving a heater fault on the extruder heater when the printed part begins.
          It will reach temperatures; print the raft I have set. Begin the cube test print, then give me this fault.

          "Heater 0 fault : exceeded allowed temperature excursion: target 254 deg C actual 237.8 deg C."

          How can I remove this fault from happening? I understand M570 can change the fault parameters, but why would I be losing that much temperature during the print?

          jay_s_ukundefined Phaedruxundefined 2 Replies Last reply Reply Quote 0
          • jay_s_ukundefined
            jay_s_uk @djthuma
            last edited by

            @djthuma Does the fan come on at that point and the heater can't keep up?
            Did you use M303 H1 or M303 T0 to tune the hotend?

            Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is

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            • Phaedruxundefined
              Phaedrux Moderator @djthuma
              last edited by

              @djthuma said in Heating issues:

              I now have a power supply for this retrofit that has 24V.

              Hang on, are you saying you were running a 12v power supply before and now you've put in 24v?

              Are the heaters 24v as well?

              @djthuma said in Heating issues:

              "Heater 0 fault : exceeded allowed temperature excursion: target 254 deg C actual 237.8 deg C."

              This could be because you're putting 24v into a 12v heater, which is very dangerous.

              Z-Bot CoreXY Build | Thingiverse Profile

              djthumaundefined 1 Reply Last reply Reply Quote 0
              • djthumaundefined
                djthuma @Phaedrux
                last edited by

                @Phaedrux
                The heater is a 24V heater paired with the bondtech direct drive and mosquito magnum hotend. PT100 sensor. PT 100 daughterboard on a duet 2 wifi.

                I did tune both heaters. The fan does come on at the layer one as you described and I found a previous post saying that could cause some temp drop if not pointed at the print. I turned off the fan and did not receive the same error.

                The other thing I did was tune the H0 to a higher temperature average because it was giving a error that the sensor couldn't reach temp.

                I think these things will resolve the issue.

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                • djthumaundefined
                  djthuma
                  last edited by

                  I am having an odd issue with the heater and fans.

                  When I begin heating the bed or extruder, the small fan on the extruder heat sink slows down.

                  Then when I am printing a calibration cube the extruder temp goes past the active set temperature.
                  I think theyre related.

                  I have that fan set on an always on output, so it is not controlled by thermostat.

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                  • Phaedruxundefined
                    Phaedrux Moderator
                    last edited by

                    Is your power supply struggling to keep up?

                    Monitor the voltage with a multimeter durings these times and see if it holds steady at 24v, or if it droops.

                    Z-Bot CoreXY Build | Thingiverse Profile

                    djthumaundefined 1 Reply Last reply Reply Quote 0
                    • djthumaundefined
                      djthuma @Phaedrux
                      last edited by

                      @Phaedrux
                      The power supply is dropping to about 18 V when I turn on the extruder heater or bed heater.

                      It is a 24 V power supply, heater and bed heater.

                      So I am not sure why it is dropping voltage.

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

                        @djthuma, you are drawing more power than the power supply is able to support (either that or it is a defective power supply)

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

                          https://docs.duet3d.com/en/User_manual/Connecting_hardware/Power_choosing

                          Z-Bot CoreXY Build | Thingiverse Profile

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                          • djthumaundefined
                            djthuma
                            last edited by

                            Thank you for the advice!

                            I feel dumb, but I forgot to switch my new power supply to 110V for US.

                            So it would drop voltage when operating, expecting 220 input.

                            Retuning heaters now.

                            Should be a resolved issue! Thanks again!

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

                              D'oh!

                              Easy mistake to make. Ask me how I know.

                              Z-Bot CoreXY Build | Thingiverse Profile

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                              • Phaedruxundefined Phaedrux marked this topic as a question
                              • Phaedruxundefined Phaedrux has marked this topic as solved
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