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  1. #1
    Join Date
    Dec 2010
    Posts
    0

    Home switches and Limit Switches

    I've got Mach 3 sorted except for the limit switches.

    I've got 6 limit switches - 1 for each end of each of the 3 axis' all wired up normally closed. 3 of those switches at the -- end I've got another wire connected up to a separate input on the normally open side of the switch.

    So effectively I have two circuits each with a separate input into the G540. Normally closed for the limits and normally open for the home circuit.

    The homing works so that is fine but I can't get the limit switch system to work. Am I doing something wrong or should I change the setup?

    Thanks
    Andrew

  2. #2
    Join Date
    Feb 2008
    Posts
    231
    I recently asked the same type of question here about limits and the G540. I was advised to connect all the limits together and wire them normally open and route them to 1 input on the G540, that way you only use 1 input. I did this and it has worked well for me. I also connected all of my home switches together and wired them to 1 input, this also worked well. The only exception to this is that I am going to add 1 more home switch to my table for my X axis so that I can square my gantry (I have 2 X axis motors) the new home sensor will have to have its own home sensor and input to the G540. If you search my post (about 2 weeks old) about this you will find allot of great information about homes and limits.

    -Scott

  3. #3
    Join Date
    Dec 2010
    Posts
    634

  4. #4
    Join Date
    Nov 2009
    Posts
    724
    Wouldn't wiring them up all normally closed in series make more sense?
    That way if you have a bad switch or a break in a wire it would actually present itself as a problem.
    And then all switches could share 1 input
    just curious

    JTCUSTOMS

  5. #5
    Join Date
    Dec 2010
    Posts
    0
    It seems I've sorted it although I'm having an issue with my Z axis now. The default distance that the "Homing" moves back off the switch is not enough for the switch to be deactivated. I know that it should but I'm getting a "Limit switch triggered" message during homing of the z axis.

    So the question is - Can I set the Z axis to move further away from the switch during Homing?

    Andrew

  6. #6
    Join Date
    Mar 2003
    Posts
    35538
    Quote Originally Posted by TheBulk View Post
    It seems I've sorted it although I'm having an issue with my Z axis now. The default distance that the "Homing" moves back off the switch is not enough for the switch to be deactivated. I know that it should but I'm getting a "Limit switch triggered" message during homing of the z axis.

    So the question is - Can I set the Z axis to move further away from the switch during Homing?

    Andrew
    There is no default distance. The machine backs off until the switch opens, then stops.

    If you're getting limit switch errors, it's almost always due to noise. The simple remedy is to increase the debounce in general config to 2000-5000. some have found that a small capacitor will help as well.
    The best solution is to remove the noise, usually caused by grounding issues.
    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

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