Duet3D Logo

    Duet3D

    • Register
    • Login
    • Search
    • Categories
    • Tags
    • Documentation
    • Order

    thermocouple FAULT LED

    Duet Hardware and wiring
    2
    2
    332
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • Woelkchen
      Woelkchen last edited by

      Hey everyone!

      I have a problem. Before I connected my heat bed, all thermocouples ( seven in total on four daughterboards) worked well. After I connected the heated bed, all fault LEDs of the thermocouples started to shine.

      I removed all the thermocouples and connected them one by one and checked each one to see if it worked. The first and second one worked most of the time. I did many variation in the connection sequence, but anytime the fault LEDs started to shine.

      I hope you can understand my problem. It is difficult to describe.

      Thank you.

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

        The FAULT LED illuminated means that the chip on the daughter board was unable to read the thermocouple.

        What type of thermocouple are you using?

        Thermocouples must be insulated from any metal parts whose temperatures they are measuring. The thermocouple cartridges that E3D sells have insulation between the thermocouple junction and the outer casing, so they should work OK. Many other types of thermocouple don't have any insulation, just a bare junction.

        Another possible source of problems is the wring. Thermocouples are normally supplied with twisted pair wires, and these must be used right up to the daughter board. Using twisted pair wire minimises interference pickup by induction.

        The FAULT LED will also light up if the thermocouple is disconnected or broken.

        HTH David

        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

        1 Reply Last reply Reply Quote 0
        • First post
          Last post
        Unless otherwise noted, all forum content is licensed under CC-BY-SA