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    Chamber heater wiring problem

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    Duet Hardware and wiring
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    • dc42undefined
      dc42 administrators
      last edited by

      Do you get the error report on the chamber thermistor as soon as you start the Duet, or only when you try to heat the chamber?

      If it's right from the start, what reading do you get if you plug the bed thermistor into the E1 thermistor connector?

      You need to use M307 to force bang-bang mode, not M301 (that was for older firmware).

      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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      • digiex_chrisundefined
        digiex_chris
        last edited by

        Ah, thanks, I'll switch to M307.

        It's in the error state immediately as i power it on. No change if I swap to the other extruder thermistor connector. I did execute X3 on the end of M305, which got me a temp display pegged at 88c, it doesn't really move.

        M305 P2 T100000 B3974 R4700 H30 L0 X3

        But X3 must not be right.

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        • dc42undefined
          dc42 administrators
          last edited by

          Did you try plugging the bed thermistor into the E1 connector as I suggested? This would tell us whether it it the thermistor that is at fault.

          In the error state, what is the temperature reading?

          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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          • digiex_chrisundefined
            digiex_chris
            last edited by

            I did, infact I tried a spare thermistor, then I tried with a new thermistor plugged into the spare channel so that it had a thermistor in each channel. Then I swapped them around. No such luck.

            @dc42:

            Did you try plugging the bed thermistor into the E1 connector as I suggested? This would tell us whether it it the thermistor that is at fault.

            In the error state, what is the temperature reading?

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            • dc42undefined
              dc42 administrators
              last edited by

              And the temperature reading?

              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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              • digiex_chrisundefined
                digiex_chris
                last edited by

                @dc42:

                And the temperature reading?

                I don't get a reading, it just says "error", unless I use the X3 parameter, in which case I get 88

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                • digiex_chrisundefined
                  digiex_chris
                  last edited by

                  @dc42:

                  And the temperature reading?

                  Oops, M105 reports T:20.3 B:21.8 C:-273.1

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                  • dc42undefined
                    dc42 administrators
                    last edited by

                    It's been a while since I tested the chamber heater support, so I'll re-test it.

                    You could a!so try plugging the thermistor into the E0 thermistor connector and using X1 in your M305 P2 command.

                    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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                    • digiex_chrisundefined
                      digiex_chris
                      last edited by

                      That also gave me an error state with a large negative temperature. I'm wondering if the combination of the first hotend temperature control using a PT100 is a factor?

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                      • dc42undefined
                        dc42 administrators
                        last edited by

                        Use of a PT100 for the hot end shouldn't affect the availability of the E0 and E1 thermistor inputs.

                        Perhaps you have a bad crimp connection on the thermistor? As you have a known working bed thermistor, try plugging that into the E0 or E1 thermistor connector, and your other thermistor into the bed thermistor connector, to see what readings you get.

                        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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                        • digiex_chrisundefined
                          digiex_chris
                          last edited by

                          Thanks! That was exactly the suggestion I needed to figure it out. Turns out the 5 thermistors I have on hand that came with connectors pre-crimped, something is wrong with them. None of them give a temperature reading, but plugging in the bed thermistor gives a sane chamber reading. Obviously that means something is wrong or unknown about my spare thermistors. An ohm meter also doesn't give a reading with them. Must have got a bad batch.

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                          • digiex_chrisundefined
                            digiex_chris
                            last edited by

                            yup, all 5 crimped onto the insulation instead of bare wire, by the supplier.

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