545,782 active members*
1,690 visitors online*
Register for free
Login
Results 1 to 5 of 5
  1. #1

    Step direction voltage not changing

    Hi gang,

    I have a homebuilt cnc router (PrintNC) that uses a UC300ETH controller with a C77 driver terminal board and UCCNC software. I started having intermittent problems with the X axis only moving in one direction and would eventually self correct. Well today it won't. With some searching here in the site, I eliminated loose connections, malfunctioning driver,keyboard, etc. When I checked the voltage for the direction terminals I get 4.7 and 0 for all the drives except the X. It stays at 4.7v despite inputting a direction change. Does this signify a bad controller or would it possibly the attached terminal board? Any thoughts or suggestions are greatly appreciated.

    Mike

  2. #2
    Registered
    Join Date
    Jan 2018
    Posts
    830

    Re: Step direction voltage not changing

    Quote Originally Posted by mchesney1 View Post
    Mike
    The C77 looks to me to have isolated outputs.
    That tells me that it is an issue with one of the optocouplers on the C77 itself.

    Any chance you could change things round and assign axis 5 or 6 to work as X instead?.

    https://www.cnc4pc.com/pub/media/pro...7rev1.5_v2.pdf

  3. #3

    Re: Step direction voltage not changing

    Will try that today. Thanks for the response!

  4. #4

    Re: Step direction voltage not changing

    Quote Originally Posted by dazp1976 View Post
    The C77 looks to me to have isolated outputs.
    That tells me that it is an issue with one of the optocouplers on the C77 itself.

    Any chance you could change things round and assign axis 5 or 6 to work as X instead?.

    https://www.cnc4pc.com/pub/media/pro...7rev1.5_v2.pdf

    That worked! Thanks for the help, it is very appreciated!

  5. #5
    Registered
    Join Date
    Jan 2018
    Posts
    830

    Re: Step direction voltage not changing

    Quote Originally Posted by mchesney1 View Post
    That worked! Thanks for the help, it is very appreciated!

    Excellent. Good to hear your working again.

    Daz.

Similar Threads

  1. Replies: 5
    Last Post: 01-12-2014, 07:07 PM
  2. Tranlate puls/dir control signals to Step Time, Step Space, Direction Hold (LinuxCNC)
    By jandan in forum General CNC Machine Related Electronics
    Replies: 4
    Last Post: 09-10-2013, 04:52 AM
  3. Direction keeps changing
    By jjacstcy in forum DIY CNC Router Table Machines
    Replies: 14
    Last Post: 05-07-2011, 09:06 PM
  4. Step/Direction pins should be Step FWD and Step BACK
    By rayscott in forum Mach Software (ArtSoft software)
    Replies: 6
    Last Post: 02-10-2010, 12:57 AM
  5. Changing of cutting direction
    By wurst17 in forum Mazak, Mitsubishi, Mazatrol
    Replies: 1
    Last Post: 07-07-2008, 04:13 PM

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
  •