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Inverting limit switches and pull down resistors

Discussion in 'CNC Mills/Routers' started by pappydan, Oct 4, 2016.

  1. pappydan

    pappydan Well-Known
    Builder

    Joined:
    Jul 29, 2016
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    I understand that the limit and homing switches work better if they are wired as normally closed instead of normally open. The wiki on the cnc xpro v2 board states that a pull down resistor needs to be in the circuit to keep from burning out the limit switches. My question is would a heavy duty switch negate the need for the pull down resistor. If not, what size resistor needs to be in the circuit.My Z axis worked fine without inverting the limit switch but when I installed the limits on the Y axis I kept getting alarms.
     

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