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  1. #1

    Join Date
    Jul 2018
    Posts
    4

    Question Advice needed (LinuxCNC + hardware)

    Hi all,

    Recently I got following items:
    - Breakout board
    - Driver DC 9-40 VDC
    - Motor 4phase - 3.6V - 2.0A (/phase) - resistance: 1.8 (ohm/phase) - inductance 2.5 (ohm/phase)
    - power supply: 12VCD 30A
    Connected tp PC by paralle cable with USB as 5vdc supply for Breakout Board.

    When I run stepconf to configure this setup I hear and measure that signal is passing BB. I can measure that it at signal side of a driver (obviously) but I do not measure any output on highvoltage side of the driver. jumpers on that drivers are set to microstepping 1:1 and amps to 2 (2.2 peak current).

    Anyone who knows how to help me with this?

    regards

  2. #2
    Registered
    Join Date
    Jan 2008
    Posts
    1037

    Re: Advice needed (LinuxCNC + hardware)

    I think you have the driver wired up wrong.

    You should not have the Dir+ En+ and Pulse+ linked.
    The inputs are "differential" inputs, to eliminate noise.
    You often only need either the Dir+ or Dir- (for example) hooked up, as the drives are often designed run single ended.
    7xCNC.com - CNC info for the minilathe (7x10, 7x12, 7x14, 7x16)

  3. #3
    Registered
    Join Date
    Apr 2004
    Posts
    718

    Re: Advice needed (LinuxCNC + hardware)

    Those are not differential inputs. They are the anode/cathode of the input optocoupler. All the + should be wired to +5 volts. The - goes to your step, direction and enable outputs of the motion controller.

  4. #4
    Registered
    Join Date
    Jan 2008
    Posts
    1037

    Re: Advice needed (LinuxCNC + hardware)

    Quote Originally Posted by jfong View Post
    Those are not differential inputs. They are the anode/cathode of the input optocoupler. All the + should be wired to +5 volts. The - goes to your step, direction and enable outputs of the motion controller.
    On second look, it looks that way. I was looking on my phone and the driver looked like a knock off leadshine, which has differential input option and doesn't need +5v (what is the point of multiple separate +5v anyway? Wouldn't one connection point with internal connections be easier?)
    7xCNC.com - CNC info for the minilathe (7x10, 7x12, 7x14, 7x16)

  5. #5

    Join Date
    Jul 2018
    Posts
    4

    Re: Advice needed (LinuxCNC + hardware)

    Hi guys,

    Tnx for fast reactions!
    What I have done so far:
    - P2 connected to DIR-
    - P3 connected to PUL-
    - at the motor side I followed the schema + description on the driver: BLK = A+; GRN A- ; RED = B+ ; BLU = B-;
    and now I have small steps in only one direction!! more then ever )

    I know that I should connect P2 to PUL- and P3 to DIR- but then nothing moves. Any idea whats going on?

  6. #6
    Registered
    Join Date
    May 2015
    Posts
    375

    Re: Advice needed (LinuxCNC + hardware)

    Try disconnecting the +5v from the enable signal. Its confusing, its actually a disable signal. If power is applied, the steppers are disabled. I apply 5v power to this pin when estop is pressed so the steppers can be turned by hand.

    And you'll get more help on the LinuxCNC forum. I have never used a parallel port.
    Rod Webster
    www.vehiclemods.net.au

  7. #7

    Join Date
    Jul 2018
    Posts
    4

    Re: Advice needed (LinuxCNC + hardware)

    HI guys,

    Thank You for suggestions! I got it working.

  8. #8
    Registered
    Join Date
    May 2015
    Posts
    375

    Re: Advice needed (LinuxCNC + hardware)

    Quote Originally Posted by LoudFart View Post
    HI guys,

    Thank You for suggestions! I got it working.
    Great! What did you do to get it going?
    Rod Webster
    www.vehiclemods.net.au

  9. #9

    Join Date
    Jul 2018
    Posts
    4

    Re: Advice needed (LinuxCNC + hardware)

    I disconnected +5v from enable signal!

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