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    PT-100 temperature constantly at 2000 degrees after failure

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    Duet Hardware and wiring
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    • DjDemonDundefined
      DjDemonD
      last edited by

      In my case the issue was with poor quality crimping on the original e3d pt100 sensor and not an iffy duetwifi board please consider that a retraction.

      I now stock pt100s without connectors with 95cm leads for less chance of a bad connection. See my signature below.

      Simon. Precision Piezo Z-Probe Technology
      www.precisionpiezo.co.uk
      PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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      • dc42undefined
        dc42 administrators
        last edited by

        @TwoTone:

        I’m having the same issue- installed new pt100 and board and it sits at 2000.
        I get 104 ohms for resistance of the PT100
        2.02 volts between 1-4 on daughter board

        2.02V is too much. Assuming you are using a 2 wire connection, you should have the 2 jumpers fitted, in which case you should measure the same voltage between terminals 2-3 on the daughter board as between 1-4.

        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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        • TwoToneundefined
          TwoTone
          last edited by

          @dc42:

          @TwoTone:

          I’m having the same issue- installed new pt100 and board and it sits at 2000.
          I get 104 ohms for resistance of the PT100
          2.02 volts between 1-4 on daughter board

          2.02V is too much. Assuming you are using a 2 wire connection, you should have the 2 jumpers fitted, in which case you should measure the same voltage between terminals 2-3 on the daughter board as between 1-4.

          Sorry was posting from memory.

          Actually using 4 wire and only see .0009 v across the terminals

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          • dc42undefined
            dc42 administrators
            last edited by

            I suggest you test the daughter board, by disconnecting the PT100, connecting a 100 ohm resistor between terminals 2 and 3, and fitting the two jumpers. That should give you a reading close to 0C.

            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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            • TwoToneundefined
              TwoTone
              last edited by

              @dc42:

              I suggest you test the daughter board, by disconnecting the PT100, connecting a 100 ohm resistor between terminals 2 and 3, and fitting the two jumpers. That should give you a reading close to 0C.

              Sorry for the delay- took a while to get a 100 ohm resistor. I'm assuming I must have a noise issue.

              With the resistor which is around 99 actual, I get -1.4C reading

              I have 2 PT100s.

              When connecting one of them directly to the daughter board with jumpers the reading ok, about 2C higher than bed thermistor. That PT 100 reads 108 ohm.

              The other is in the hot end. When I measure resistance at the wire ends I plug into the daughter board it reads about 109 ohms.
              When I turn on the printer, it reads 2000c. Each pair is twisted and running down separate towers.

              I have the 2 wires of the PT100 going into the hotend connector, from the connector at the hotend it's 4 wires.

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              • dc42undefined
                dc42 administrators
                last edited by

                @TwoTone:

                @dc42:

                I suggest you test the daughter board, by disconnecting the PT100, connecting a 100 ohm resistor between terminals 2 and 3, and fitting the two jumpers. That should give you a reading close to 0C.

                Sorry for the delay- took a while to get a 100 ohm resistor. I'm assuming I must have a noise issue.

                With the resistor which is around 99 actual, I get -1.4C reading

                That is about right. So it looks like the daughter board is OK. Did you test both channels?

                @TwoTone:

                I have 2 PT100s.

                When connecting one of them directly to the daughter board with jumpers the reading ok, about 2C higher than bed thermistor. That PT 100 reads 108 ohm.

                The other is in the hot end. When I measure resistance at the wire ends I plug into the daughter board it reads about 109 ohms.
                When I turn on the printer, it reads 2000c. Each pair is twisted and running down separate towers.

                I have the 2 wires of the PT100 going into the hotend connector, from the connector at the hotend it's 4 wires.

                If they are twisted pairs then it is unlikely that they are picking up interference. Please check with your multimeter whether you can measure any resistance between the PT100 wires and the case of the PT100 sensor. It should read out-of-range even on your multimeter's highest resistance scale.

                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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                • Starscream83undefined
                  Starscream83
                  last edited by

                  Hi,

                  I thought i share my experience with PT100 and my Printer setup. I got random 2000 degree spikes throughout the print. It turned out to be noise from the Layer Fan which wires go thru the same cable as the PT100. Reducing the Layer Fan PWM frequency to 10Hz solved the issue and the fan still works very well.

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                  • TwoToneundefined
                    TwoTone
                    last edited by

                    Between work and my son's busy schedule we're finally getting back to this, where do I adjust the fan's frequency?

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

                      @twotone by modifying the M106 fan command in config.g for the particular fan you want to change. Frequency is controlled by the F parameter.

                      https://duet3d.dozuki.com/Wiki/Gcode#Section_M106_Fan_On

                      Z-Bot CoreXY Build | Thingiverse Profile

                      TwoToneundefined 1 Reply Last reply Reply Quote 0
                      • TwoToneundefined
                        TwoTone @Phaedrux
                        last edited by

                        @phaedrux Thanks

                        1 Reply Last reply Reply Quote 0
                        • TwoToneundefined
                          TwoTone
                          last edited by

                          Just thought I would post to wrap up my problem and incase anyone else runs into the same issue.

                          I was using a Makerhive Yellow Jacket Quick Clip.
                          It seems like the gauge of the PT100 wires was too small. It made just enough contact for the resistance measurements, but failed when powered up.

                          When I routed the PT100 using a seperate JST plug, it all works correctly now.

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