584,817 active members*
4,875 visitors online*
Register for free
Login
IndustryArena Forum > CNC Electronics > CNC Machine Related Electronics > Understanding EMC2 and feedback concepts
Results 1 to 2 of 2
  1. #1
    Join Date
    Sep 2004
    Posts
    1207

    Understanding EMC2 and feedback concepts

    As this gets asked quite often from us, I drew a diagram of how the whole controller system looks (simplified) when making feedback system with EMC2 and VSD drives.

    In some cases user wants to have dual feedback for maximized machine accuracy. Dual feedback is a system where there are two separate loops controlling machine:

    • Inner loop, in this case motor velocity control within VSD drive and motor encoder
    • Outer loop, in this case position control inside EMC and second encoder (linear encoder etc)


    The same structure is present with single loop system (using only motor encoder).

    I hope this helps
    Attached Thumbnails Attached Thumbnails dualfeedback.jpg  
    Attached Files Attached Files

  2. #2
    Join Date
    Jul 2003
    Posts
    1753
    Awesome!

    So - The drives can take +/-10 and pwm? How does the pwm work? (normally you would have pwm up / down or pwm + dir.) Do you only have one pin where the pwm is set so 50% duty cycle is 0 output?

    I love that with your drives you have the option of getting away from step/dir.

    sam

Similar Threads

  1. understanding the process
    By tipaj in forum Uncategorised CAD Discussion
    Replies: 2
    Last Post: 05-04-2011, 11:47 PM
  2. Need some general help understanding what EMC2 is capable of...
    By p27182 in forum LinuxCNC (formerly EMC2)
    Replies: 11
    Last Post: 10-19-2009, 06:14 AM
  3. Need Help Understanding the Basics in Cad
    By Mr.Chips in forum Uncategorised CAD Discussion
    Replies: 11
    Last Post: 01-21-2009, 08:23 PM
  4. LATHE G28 Help Understanding!!!!
    By 1ctoolfool in forum Haas Mills
    Replies: 13
    Last Post: 10-24-2007, 10:34 AM
  5. Emc2 with encoder feedback
    By R.thayer in forum LinuxCNC (formerly EMC2)
    Replies: 5
    Last Post: 01-27-2007, 04:26 PM

Posting Permissions

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