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Current / Reverse Polarity Protection?

Discussion in 'CNC Mills/Routers' started by Jason McMahon, Jun 30, 2017.

  1. Jason McMahon


    Jan 20, 2017
    Likes Received:
    Hello everyone, I am currently building a homebrew Grbl CNC Router at the moment and just after some advice: I am wondering if I should add current and reverse polarity protection to the electronics.

    My current plan is to have a 24V power supply connected to a 24V-12V step down converter: 24V for the 3x single channel TB6560 drivers and 12V for an Arduino Uno and a PC case fan. I intend to put a 3.5A quick-blow fuse inline for each of the drivers. What sort of current protection should I put in for the Arduino, if any?

    Also, should I consider some sort of polarity protection circuit for the drivers and/or the Arduino?

    The Enclosure (Work in progress!): https://i.imgur.com/tl0aoEn.jpg

    The power connector (Not installed in previous photo): https://i.imgur.com/agZE4IY.jpg
  2. Joe Santarsiero

    Joe Santarsiero OB addict
    Staff Member Moderator Builder

    Oct 30, 2014
    Likes Received:
    Not sure about the other bits, but I believe the Arduino has a selfhealing fuse onboard.

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