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Thread: Comm loss is driving me bonkers

  1. #1
    Join Date
    May 2010
    Location
    Qualicum Beach, B.C.
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    143

    Default Comm loss is driving me bonkers

    Have been running this older, upgraded Shopbot PRT Alpha and Colombo 5HP spindle for years with few issues. I've been controlling it with a Sony Vaio which has been absolutely bulletproof...until now. I retired 18 months ago and I kept one of my Shopbots for hobby work, I'm just getting it put back together now. Everything is grounded, I can power everything up and move/jog the gantry all over without issue except for when I start up the spindle. Each time I turn it on I get a comm loss message within 5 to 10 seconds. I've tried updating the firmware, checking all connections, ensuring my power and data cables are separated etc. The computer is a standalone and not connected to the net. The only way I can re-establish the comm is to do a hard boot of the PC...any thoughts???

  2. #2
    Join Date
    Jan 2004
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    iBILD Solutions - Southern NJ
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    7,853

    Default

    Make sure your 5 and 24v power supplies are working to full voltage and check the contactors for control and spindle.
    High Definition 3D Laser Scanning Services - Advanced ShopBot CNC Training and Consultation - Vectric Custom Video Training IBILD.com

  3. #3
    Join Date
    May 2010
    Location
    Qualicum Beach, B.C.
    Posts
    143

    Default

    Thanks Brady. Forgot to mention this is a Colombo spindle without speed control through the control box. Will go re-check all connections and voltage next.

  4. #4
    Join Date
    Sep 2011
    Location
    Tucson, AZ
    Posts
    6

    Default

    Try changing the usb cable with a good high quality shielded cable. It may not fix the problem but it's the easiest place to start and certainly can't hurt anything.

  5. #5
    Join Date
    May 2010
    Location
    Qualicum Beach, B.C.
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    Default

    Yup, that'll be next. There is a shielded cable on there now but things do wear out. This machine has been very reliable and at times has run for ten hours a day, five days a week.
    When I closed my shop I disassembled the table and disconnected all wiring between the Shopbot and control box. The machine sat for about eighteen months while I waited for construction of my home workshop to be completed. I put everything back together the way it had always been. Everything is steady and works as it should right up until the spindle is rotating. After a few seconds of the spindle running, up pops the lost comm message. This isn't one of those random comm issues as it is repeatable and exhibits the same behavior every time.

  6. #6
    Join Date
    Dec 2000
    Location
    Thorp, WI
    Posts
    2,600

    Default

    You may need to have a filter on the spindle now due to some difference between building wiring from old to new shop. Make sure you have some separation between the spindle wiring and USB.
    Scott

    If guns kill people, I guess pencils misspell words, cars drive drunk and spoons make people fat.

    "Those who hammer their guns into plows, will plow for those who do not" - Thomas Jefferson


  7. #7
    Join Date
    May 2010
    Location
    Qualicum Beach, B.C.
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    143

    Default

    Problem solved, thanks to all that offered suggestions. Turns out it was a harmonics issue with the PC and control box having the same power source. In the end it was our electrician that figured it all out; when he explained what was causing the problem I just looked at him and nodded my head like I knew what he was talking about. ;-)

  8. #8
    Join Date
    Jan 2004
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    iBILD Solutions - Southern NJ
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    7,853

    Default

    Quote Originally Posted by Stagecraft View Post
    Turns out it was a harmonics issue with the PC and control box having the same power source.
    Ground loop?

    Glad you got it sorted.
    High Definition 3D Laser Scanning Services - Advanced ShopBot CNC Training and Consultation - Vectric Custom Video Training IBILD.com

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