Duet3D Logo Duet3D
    • Tags
    • Documentation
    • Order
    • Register
    • Login

    Advised Current Limits for Duet 0.6

    Scheduled Pinned Locked Moved
    Duet Hardware and wiring
    2
    3
    545
    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.
    • DocTruckerundefined
      DocTrucker
      last edited by

      Hi.

      What are the designed limits for the low side switched devices? I've had a look at the wiring diagram and the limits are clearly not determined by the mosfet selection, it is more likely that this is determined by the connectors?

      Heated bed: 10A
      Hot end heater? Two of the 2.54mm pins so 4-6A?
      Fan0? only one of the 2.54 pitch pins so 2-3A?
      External PSU enable? Mosfet can sink 1.05A. Limit to 500mA? This pin grounded by the Duet means PSU on doesn't it?

      As said elsewhere I'm looking at appropriate fusing, especially for anything with long wire runs. I was thinking of leaving the PSU current limit the V_in, but perhaps a fuse there also would be wise. I'm not planning on fusing the steppers as they are driven by a current limiting driver. If there is an over current I'm going to assume this means a board failure and so a fuse on the V_in or 5V supply would be the best place to catch this?

      With regards to the 5V supply I was considering fusing the supply at 2A, is that plenty so long as additional devices like a screen don't pull power from the duet?

      My set up is fairly standard with IR probe, 5 steppers (4 1.33A from Ormerod - 2 z-axis running in series - and 1 small drive from E3D for the titan), Standard E3D V6 24V heater, 300W 24Vsilicone mat heater, upto 3 end stop switches and a filament detector. Power supply is a 350W 24V PSU from Ooznest and I will source an appropriate 5V PSU to supply the duet and ancillaries.

      Thanks.

      Running 3 P3Steel with Duet 2. Duet 3 on the shelf looking for a suitable machine. One first generation Duet in a Logo/Turtle style robot!

      1 Reply Last reply Reply Quote 0
      • dc42undefined
        dc42 administrators
        last edited by

        The Molex KK connectors are best limited to 2A per pin, so I'd say 4A max for the hot end heater and 2A max per fan (but most fans used in 3D printers draw much less than this).

        The Duet 0.6 can supply more than 10A bed heater current if you bypass a weak PCB trace with a wire. I'm not certain of the rating of the bed heater terminal block on the 0.6, but it might be 16A.

        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
        • DocTruckerundefined
          DocTrucker
          last edited by

          Thanks!

          Running 3 P3Steel with Duet 2. Duet 3 on the shelf looking for a suitable machine. One first generation Duet in a Logo/Turtle style robot!

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