Duet3D Logo

    Duet3D

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

    Shared ground connection with fan, Z-probe and E0-probe?

    Duet Hardware and wiring
    3
    4
    708
    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.
    • A Former User
      A Former User last edited by

      Using the search tool I didn't find an answer to my question below.

      To save some wiring I want these parts to share their ground connection:

      • Always On fan
      • Z probe board
      • E0 temperature probe

      Could there be a problem?

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

        Do not share the always-on fan ground connection with either of the others. It may induce noise on the other signals, and if the ground connection breaks then you end up feeding 12/24V through the fan to the thermistor input and the Z probe input (although both are protected from over-voltage on the Duet WiFi).

        You could share the thermistor and IR sensor grounds, although this may lead to a slight loss of temperature reading accuracy and additional noise in the temperature reading at high temperatures. Use the IR sensor ground connection on the Duet (not the thermistor ground) to avoid blowing the VSSA fuse.

        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
        • A Former User
          A Former User last edited by

          Thanks for making this clear.
          So I won't use shared ground connections.
          It's just not worth it.

          1 Reply Last reply Reply Quote 0
          • T3P3Tony
            T3P3Tony administrators last edited by

            Yes, to add for anyone else reading this thread the temperature ground is a seperate ground on the DuetWifi to reduce interference and it is protected by a small SMT fuse. Care should be taken with the ground on any thermistor circuits.

            www.duet3d.com

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