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VFD EMI help.

Discussion in 'OpenBuilds Forum Help' started by Karl1972b, May 11, 2020.

  1. Karl1972b

    Karl1972b New
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    Machine pauses frequently when running code. I hit "restart grbl" starts up then will eventually pause again. Any help is appreciated thanks.
     
    #1 Karl1972b, May 11, 2020
  2. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Did you try v1.0.235 yet, there is a fix (beta, please test and let me know if it solved the issue for you) in 1.0.235, which was released yesterday: See OpenBuilds/OpenBuilds-CONTROL

    Also, double check that you did follow step 4.2 of the BlackBox documentation: OpenBuilds BlackBox 4X Documentation
     
    #2 Peter Van Der Walt, May 12, 2020
  3. Karl1972b

    Karl1972b New
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    No luck. Updated and usb settings. Tested with vfd turned off. No stopping so I'm guessing there maybe interference somehow. Going to change over to a windows7 pc and see how that does.
     
    #3 Karl1972b, May 12, 2020
  4. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Ahh VFDs, yeah they are terrible. EMI for sure. Buy a 20 pack of clip on ferrites on amazon (;
     
    #4 Peter Van Der Walt, May 12, 2020
  5. Karl1972b

    Karl1972b New
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    For the usb cable?
     
    #5 Karl1972b, May 12, 2020
  6. Karl1972b

    Karl1972b New
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    Update: changed the USB cable. Working fine sofar. Thanks for the help.
     
    #6 Karl1972b, May 12, 2020
  7. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Any cable could act as the antenna that brings noise into the system. Patching one leak, might show the next. USB is obvious, But i've seen keyboard cable bring EMI into the USB hub on the motjerboard, and then Windows disables the whole USB hub. So get a 20 pack and clip it one USB, PC, Power, Endstops, etc
     
    #7 Peter Van Der Walt, May 12, 2020
  8. Karl1972b

    Karl1972b New
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    Will do. Thanks for the help
     
    #8 Karl1972b, May 12, 2020
    Peter Van Der Walt likes this.
  9. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Other than the quick fix
    - VFD in metal enclosure that is earthed
    - Earth spindle body
    - Shielded cable between VFD and Spindle (shield earthed only on VFD side)
    - Setup a Star grounding scheme: earth machine frame too

    VFDs (especially the cheaper ones) spit out a tonne of EMI unfortunately
     
    #9 Peter Van Der Walt, May 12, 2020
  10. Karl1972b

    Karl1972b New
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    More headache than its worth. May end going with a palm router.
     
    #10 Karl1972b, May 12, 2020

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