How do I electrically disconnect my Z axis limit switches - Page 4


Page 4 of 4 FirstFirst 1234
Results 37 to 42 of 42

Thread: How do I electrically disconnect my Z axis limit switches

  1. #37
    Registered
    Join Date
    Jan 2005
    Location
    USA
    Posts
    1437
    Downloads
    1
    Uploads
    0

    Default Re: How do I electrically disconnect my Z axis limit switches

    Quote Originally Posted by philbur View Post
    Can you be more specific. If the suppressor is connected across a particular contactor or an unused convenience power socket, how can it influence noise entering through say the limit switch wiring. What am I missing.

    Phil
    I may have misunderstood. If the RC filters are on the limit switch pins on the BOB they will be effective. If they are on other circuits then they won't. An RC filter on the limit pins on the BOB could help to filter the noise.



  2. #38
    Registered
    Join Date
    Aug 2016
    Posts
    6
    Downloads
    0
    Uploads
    0

    Default Re: How do I electrically disconnect my Z axis limit switches

    philbur,
    In Mach3, from the menu bar, select Config ->Ports and Pins, then select the Input Signals tab. You will see the screen below. Clicking on any of the green check marks will disable the limit on the corresponding axis. As an example, on my machine, the physical switches for X++, X--, and X home are NC and all connected in series. The resulting two wire connection goes to one input on my BOB. So to see if the X axis is the source of the noise, I just click on those three green checkmarks and that input on the BOB is ignored by Mach3.

    Keep in mind after making changes on that Mach3 Input Signals screen, you need to restart Mach3 for it to take effect.

    How do I electrically disconnect my Z axis limit switches-limitdisable-jpg



  3. #39
    Registered john-100's Avatar
    Join Date
    Mar 2007
    Location
    uk
    Posts
    1184
    Downloads
    0
    Uploads
    0

    Default Re: How do I electrically disconnect my Z axis limit switches

    Hi Phil

    the noise filter kit adds a "snubber" (series connected capacitor + resistor) across the coil of contactors C1 & C2 and the third across the live & neutral to the outlet for the coolant pump

    unless you switch the coolant pump on and off while running a job I don't expect the filter kit to help

    the picture of the control board is not detailed enough to work out how it all works but
    I can see there is two isolated power supplies
    one provides +5V & +12V for the computer side of the circuits and another +5V & +12V for the isolated I/O side

    with the part numbers being un-readable I have only found 10 opto-isolators

    How do I electrically disconnect my Z axis limit switches-controller-jpg

    John



  4. #40
    Gold Member
    Join Date
    Jun 2006
    Location
    Suffolk, UK
    Posts
    2472
    Downloads
    0
    Uploads
    0

    Default Re: How do I electrically disconnect my Z axis limit switches

    Hi John, thanks for the input.

    The J2 terminal block in the top right, with the group of 4 regulators underneath, is the connection point for the limit/homing switches. It appears that the regulators are connected to the J2 block. Would the regulators serve the function of isolating any noise on the limit switches wiring from the controller.

    Phil

    Attached Thumbnails Attached Thumbnails How do I electrically disconnect my Z axis limit switches-controller-hires-jpg  


  5. #41
    Gold Member
    Join Date
    Jun 2006
    Location
    Suffolk, UK
    Posts
    2472
    Downloads
    0
    Uploads
    0

    Default Re: How do I electrically disconnect my Z axis limit switches

    Thanks mill808, found it, great.



  6. #42
    Registered
    Join Date
    Dec 2008
    Location
    Switzerland
    Posts
    474
    Downloads
    0
    Uploads
    0

    Default Re: How do I electrically disconnect my Z axis limit switches

    Quote Originally Posted by philbur View Post
    I see that the Tormach installation manual for their high speed spindle doesn't even address EMI, am I missing something?
    PathPilot does "debounce" the limit switch inputs in the HAL layer (software debounce). The comment implies this is only done to improve immunity to interference from the coolant circuit but it will help with most other sources of electrical noise.
    Step


    Sent from my iPhone using Tapatalk



Page 4 of 4 FirstFirst 1234

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  


About CNCzone.com

    We are the largest and most active discussion forum for manufacturing industry. The site is 100% free to join and use, so join today!

Follow us on


Our Brands

How do I electrically disconnect my Z axis limit switches
How do I electrically disconnect my Z axis limit switches