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Thread: Stepper problem

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  1. #1
    Hi everyone,

    I tried wiring my old stepper, drivers, bob and psu yesterday and setting up Mach3. I can make the steppers move correctly from Mach3, but there's a horrible sound coming from the motors, accompanied with huge vibrations and noise:
    https://www.youtube.com/watch?v=jOdE...ature=youtu.be

    Can anyone tell me what is wrong :( ?

    Electronics:
    - 5 axis bob v5
    - CW8020 drivers
    - nema 23 425oz
    - another chinese driver and motor (http://www.aliexpress.com/item/NEMA2...028971350.html)
    - 36V 9.7A PSU

    The last driver + motor have been bought less than a month ago and make the same weird sound, which makes me think that the BOB is the issue. It's not just one motor that doesn't work, it's all of them.

    Thanks a lot for your help !

    Cheers !

    EDIT:

    - PSU tested, all outputs are good.
    Last edited by eurikain; 09-09-2015 at 11:49 AM.

  2. #2
    Wal's Avatar
    Lives in Stockport, United Kingdom. Last Activity: 30-03-2023 Has been a member for 9-10 years. Has a total post count of 491. Received thanks 71 times, giving thanks to others 29 times.
    Quote Originally Posted by eurikain View Post
    It's not just one motor that doesn't work, it's all of them.
    Which would likely indicate that your motors are fine and it's something further on up the chain. Have you double checked that your wiring's correct..? Yeah, a silly question but it's the silly things that often catch you out. Came across this vid on YouTube, guy puts his issues down to a burned out stepper controller (driver?). Are your drivers getting enough juice?

    Anyway, just a couple of ideas - but like I say, don't overlook having done something silly. Check and double check...

    Wal.

  3. #3
    Pretty sure by the Sounds and jumping you have the motor phases wired wrong. This will be why they all make the same noise if wired the same.

    How have you wired them Parallel or series. If you have a data sheet showing the motor wiring colours post it and I'll take a look.

  4. #4
    Hi guys, thanks so much for the replies. Here is the information you have requested, plus several pictures of my drivers, bob, and wiring, and also other essential information. The wiring diagram is at the end of this post.

    Break out board:

    5 axis break out board V5 from buildyourcnc.com:



    I wired it and set up mach3 using the instructions at:
    http://www.buildyourtools.com/phpBB3...php?f=8&t=2128

    Stepper motors:

    • 60BYGH303-13 (8 leads) from buildyourcnc.com:
      https://buildyourcnc.com/Documents/P...-13)%20(1).pdf



      To be noted:
      - I have them wired bipolar parallel
      - honestly, nice looking motors, quality seems to be there, I doubt they could be broken, at least not all three at the same time.
    • 57BYGH8930 (4 leads: GREEN, BLUE, YELLOW, RED) from AliExpress.



      To be noted:
      - No data sheet provided
      - The leads don't match Nema 23 standards, but I found the wiring on some other Chinese motor with the same color code... It said: GREEN=A-; RED=A+; BLUE=B-; YELLOW=B+.
      - Here is the link to the original AliExpress item, but this probably won't be of any help:
      http://www.aliexpress.com/item/NEMA2...028971350.html
      - I think I was out of my mind when I bought this guy... but oh well, now that I have it I better use it :)


    Stepper drivers:

    • CW230, also from buildyourcnc.com:



      To be noted:
      - No information on what switch 4 and 8 are for....
      - It has CW+/- and CP+/- instead of common DIR/STEP pins
      - I wired it using the instructions at:
      http://www.buildyourtools.com/phpBB3...php?f=8&t=2128

      Switches are set to 2.4A and 1/8 mcs:
      SW1=0 (down)
      SW2=0 (down)
      SW3=1 (up)
      SW4=0 (down)
      SW5=1 (up)
      SW6=0 (down)
      SW7=1 (up)
      SW8=0 (down)
    • FMD2740A, came with the motor I bought on AliExpress (same link as for the motor):



      To be noted:
      - I don't know what "Delay MD" is (switch 1 and 2). I tried slow and fast, no change in the motor behavior.
      - No information saying which if switch up = 1 or 0. There is a writing below the switches that shows a little arrow pointing down and on its left is written 0N. I assumed 0 was down, 1 was up.

      Switches are set to 2.5A and 1/8 mcs:
      SW1=0 (down)
      SW2=1 (UP)
      SW3=1 (up)
      SW4=0 (down)
      SW5=0 (down)
      SW6=0 (down)
      SW7=0 (down)
      SW8=1 (up)


    Power supply:

    36V 9.7A from buildyourcnc.com


    I know this is not sufficient for all four motors, but don't worry the problem does not come from this as I have tried using only 3 or 1 motor, same issue with the noise and huge vibrations. I have actually tried several combinations: 450oz motor alone, one 425oz motor alone, all three 425oz motors together, all four motors together. Same problem, no change. Now, for the four motor working together, and to use all the 9.7A (I know I'll be underpowered, no worry I'll buy another PSU later on, I just want to make sure my motors, bob and drivers work fine first), I set the them as follow:


    • 450oz motor needs 3.2A, I give it 2.5A
    • 425oz motors needs 2.8A, I give them 2.4A


    Total is 2.5 + 3 * 2.4 = 9.7A.

    Here is the wiring diagram (note the motors model name):



    Thanks so much for your help ! I hope to find what is not working right, so I can either fix it or buy some replacements.
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    Last edited by eurikain; 09-09-2015 at 11:58 PM.

  5. #5
    It's hard to tell from the pics but the 8 wire motor looks like it's got 2 red wires going to A+.? You should have
    A+ = Red & Blue
    A - = Black & yellow
    B+ = wht & brn
    B - = Org & Grn

    If correct then I have known some cheapp drives do strange things like this when the pulse is on the wrong side. So try changing the active state in Mach3 and see if it makes a difference.

    Also what are you using for a parallel port cable.? It must be a straight thru cable not an old printer cable.!

  6. #6
    I just updated the wiring diagram.

    I have the wires plunged as you said. No double red going to A+, that's just my picture that was not taken right :)

    When you say change the active state in Mach3, do you mean change to low active to low high ?

    I am using a male-female cable I bought three years ago. I think it's the correct cable, as it worked fine three years ago :/

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