1. #1
    Hello, i need help I can not get comunication between servo drive and BOB, I use Mach


  2. #2
    a bit of info on what you have done will help, like a wiring schematic or a link to what you have.
    However to start with make sure you have wire between the servo driver and breakout board, without wire it will not work.

  3. #3
    Thanks Sr for bring to me some help, I am in the process of build a router, I already finished the table, I use ballscrews and linear rails, I bought 4 DELTA asda a2 servos and drives 750 w, a PMDX126, for the gantry move 2 servomotors/2 ballscrews.

    I read the asda manual to many times but I am lost, the CN1 are wiring like this pin 37 (Pull Hi-s) to pc+5V,pin 37 (/sign) to "2",pin 41 (/pulse) to "3" on Pmdx 126. I dont have E=stop or limits switches yet.

    With the ASDA software , the motor can jogging using the usb cable from drive to pc, force enable state.

    from drive to BOB to pc via parallel port to pc the motor no move and have some resisting to turn by finger, I measure the voltages on BOB Pc+5V, "2","3" , reading 5 volts, and 0 volts when jogging the right and left arrows ,Mach3 shows the position change, maybe is the wiring missing connections or the parameters on the drive ,

    Thanks again for read this post


  4. #4
    You need to Enable the servo circuit. Quick look at the manual tells me you use pin 9 on the Digital inputs.
    The way this is done is using relay that turns on all the the drives at same time using the Enable OUTPUT of PMDX. So when Mach3 is Enabled it takes control of the motors.

    So Relay Coil is controlled via PMDX using Enable OUTPUT. Then Run the wire from VDD on drives thru the relay contacts and back to Pin9.
    Last edited by JAZZCNC; 27-04-2016 at 08:11 AM.

  5. #5
    Thanks, i work this weekend on yours directions and i let know the outcome

  6. #6
    I follow your instructions and i get movement from the servo motors I slave "A" motor to "X" axis, now the problem is the movement is to slow, on the asda a2 manual said "1280000 pulse/rev" but in mach3 said 2000 steps, which is a good number for that box in tunning window and get a good rapids.

  7. #7
    The steps Per setting is not something you can guess or what sets the Rapid speed. It's an exact number which ensures you move the correct distance for one unit of measurement derived from calculation of the Encoder Resolution divided by the distance traveled for Revolution.

    So if your Encoders are 2500ppr and they are quadrature this number becomes 2500 x 4 =10,000ppr. And your using Ballscrews with 10mm pitch connected directly to the motors. Then the steps per setting would be 10,000 / 10 = 1000 Steps per.

    However if your using a Ratio to connect screws to motor, which with servos you probably will be doing then calculation gets a little more involved. See the Mach manual and it will explain how to calculate this depending on your setup.

Similar Threads

  1. Easy Servo Drive?
    By Tenson in forum General Discussion
    Replies: 38
    Last Post: 19-10-2015, 03:39 PM
  2. Build Log: Servo Drive and VFD with vector control
    By Jonathan in forum Electronic Project Building
    Replies: 17
    Last Post: 05-04-2015, 06:58 PM
  3. eBay: SEM SERVO MOTOR SEM MT30 U4-48, LAMBDA psu,s, 160v servo drive
    By deisel in forum Items On eBay UK
    Replies: 0
    Last Post: 29-01-2015, 07:55 AM
  4. FOR SALE: 160v dc servo drive
    By deisel in forum Items For Sale
    Replies: 0
    Last Post: 27-01-2015, 02:16 PM
  5. Servo drive problems
    By Tomnewry in forum Motor Drivers & Controllers
    Replies: 15
    Last Post: 27-03-2013, 10:30 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