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    Z motors messed up

    Duet Hardware and wiring
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    • ericsmith66
      ericsmith66 last edited by

      My Z motors are having some kind of issue. I left a print running last night and this morning the z axis would only run in one direction. I have 2 z motors and one of the z motors cables has a burned spot on the connector for the red and blue pin where it connects to the board (z1). Both z1 and z2 are having the same issue.

      Previously I have had a issue with the fan VIN not working correctly I switched it to the 5 volt and it has bee working fine. I purchased the unit in January and have not had any other issues with it.

      Any guidance ?

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      • dc42
        dc42 administrators last edited by

        Most likely there is a bad crimp connection on the connector pin where that burned spot is.

        The fan not working when the fan voltage selector jumper is set to VIN probably means that you shorted out one of the fan connectors and fused the trace between the + side of the VIN terminal block and the VIN pin on the voltage selection jumper. You can bypass that trace with a wire on the back of the board.

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        • ericsmith66
          ericsmith66 last edited by

          You can see the burn mark here the crimps on the end looked good.

          https://www.dropbox.com/s/txm4dqul1nnpmuf/IMG_0728.JPG?dl=0

          Do you think If re-crimp the ends it will be ok?

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          • dc42
            dc42 administrators last edited by

            The burn mark indicates that one of two things happened:

            1. You had a bad connection on that pin. It was probably a bad crimp connection, but possibly the crimp pin was distorted so that the spring didn't make good contact with the pin. Also check that the soldering of those two pins on the underside of the Duet is sound.

            2. You had massive overcurrent on those pins, most likely because of a short between those two wires. If so then there will probably be a burn mark on the stepper driver too.

            The fact that both pins were affected suggests over-current.

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            • ericsmith66
              ericsmith66 last edited by

              No burn marks on the underside or around the stepper. I rewired it but now its not driving the motor at all. ( I also checked the motors on the other x and Y ) It has been working fine for about a month. Any other Ideas?

              Thanks
              Eric

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              • dc42
                dc42 administrators last edited by

                What do you mean by "I also checked the motors on the other x and Y" ?

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                • ericsmith66
                  ericsmith66 last edited by

                  I verified that the motors work by using the x and y connectors.

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                  • dc42
                    dc42 administrators last edited by

                    If you are sure that the wiring was OK then I suggest you make a warranty claim. See https://www.duet3d.com/warranty.

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                    • ericsmith66
                      ericsmith66 last edited by

                      Ok thanks I will recheck everything again tonight.

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                      • ericsmith66
                        ericsmith66 last edited by

                        Ok – so the same issues happened again. the z-motors are messed up after a print (4 hours ) and one of the motors has a burnt pin. ( this is with the same motors but a different duet wifi). I am beginning to believe its me and not the duet. I had not touched anything on the duet and it has been printing fine for a couple of weeks. I guess it could have been a bad crimp but I don't really believe it. What else could cause the over current?

                        I will re-crimp the wires and see if the driver is ok.

                        Thanks
                        Eric Smith

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                        • dc42
                          dc42 administrators last edited by

                          A burned pin normally means a bad connection between the wire and the crimp or terminal block etc.

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                          • ericsmith66
                            ericsmith66 last edited by

                            Checked that , is there something on the motor itself that could cause this. The board has been installed for a couple of weeks now. This is the second time this has happened to me with 2 different duets. I see at least one other thread on the same topic.

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                            • dc42
                              dc42 administrators last edited by

                              If you mean a burned pin on the connector on the motor itself, then it could be a bad connection inside the motor. But it's more likely a bad crimp connection in the wire going into the connector.

                              If you mean a burned pin on the motor connector on the Duet, then it'a almost certainly a bad crimp connection on that pin. But check the underside of the Duet too to make sure that the pin is properly soldered into the PCB.

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