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IndustryArena Forum > CNC Electronics > Viper Servo drives > Servo only holding/moving in one direction
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  1. #1
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    Mar 2009
    Posts
    8

    Servo only holding/moving in one direction

    I am doing a mach3 retrofit on a ycm40 .
    I bought the viper 200 drives in Dec. 2016
    But just got to the point of installing the electronics
    A few weeks ago. It has SEM servos with
    US digital encoders. I have had all three axis
    Working. I have been working on the spindle
    For a few days and when I went to move the Y
    Axis tonight it will only move and hold in one direction.
    Any ideas on what could cause this?
    It's been working fine could I have damaged
    The drive somehow?
    Thanks Jim

  2. #2
    Gold Member
    Join Date
    Apr 2004
    Posts
    4880

    Re: Servo only holding/moving in one direction

    It might be a wire that's come loose. Check all the connections.
    Andrew Werby
    Website

  3. #3
    Junior Member
    Join Date
    Jun 2010
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    3912

    Re: Servo only holding/moving in one direction

    sounds as tho the Dir line is not connected, or not assigned.

    Cheers
    Roger

  4. #4
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    Mar 2009
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    8

    Re: Servo only holding/moving in one direction

    It had been working fine the drive needed some fine tuning.
    In viper tune I am getting steps in both directions
    And the encoder is reading.

  5. #5
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    8

    Re: Servo only holding/moving in one direction

    Well I found one leg of the upper right resistor not attached
    To the board. It looks like it may have been hot
    Where it attached to the board. I removed the board from the heat sink
    To see the components on the back and nothing look
    Burned or had that magic smoke smell. I soldered
    The resistor back and no change.

  6. #6
    Junior Member
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    Jun 2010
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    3912

    Re: Servo only holding/moving in one direction

    That's the current-sensing resistor.
    Sad to say, I think you need a new board. Cooked semiconductor somewhere.

    Cheers
    Roger

  7. #7
    Company Representative
    Join Date
    Feb 2007
    Posts
    942

    Re: Servo only holding/moving in one direction

    If its only holding in one direction , its a mosfet or a mosfet driver.
    Just send it back and i will repair it for $25-35. Thats not a current sensing resistor. Thats the incoming voltage regulator ... designed to burn and save the reg and pcb from blowing.

    If you want to try to replace the 2 IR2104's that may be the problem.
    Send me an email ... larken@storm.ca

    Larry K
    Manufacturer of CNC routers and Viper Servo Drives
    www.LarkenCNC.com and www.Viperservo.com

  8. #8
    Junior Member
    Join Date
    Jun 2010
    Posts
    3912

    Re: Servo only holding/moving in one direction

    At the risk of repeating myself - that's the difference between Chinese and American vendors.

    Cheers
    Roger

  9. #9
    Company Representative
    Join Date
    Feb 2007
    Posts
    942

    Re: Servo only holding/moving in one direction

    < At the risk of repeating myself - that's the difference between Chinese and American vendors.>

    Seriously , lol ? China has designed nothing.. they just copy and pirate other countries designs. Then their communist government subsides the manufacturing and also the shipping.
    They are doing their best to put the rest of the world out of manufacturing jobs with their insanely low prices that don't add up..

    ( Im not sure why your bringing this up here btw ? )

    Larry
    Manufacturer of CNC routers and Viper Servo Drives
    www.LarkenCNC.com and www.Viperservo.com

  10. #10
    Junior Member
    Join Date
    Jun 2010
    Posts
    3912

    Re: Servo only holding/moving in one direction

    Hi Larry

    I think you may have misunderstood what I was saying.
    A repeated problem mentioned by many readers here is that they get zero support from the Chinese vendors when their 'cheap' stuff does not work as advertised, especially eBay vendors of course. On the other hand, you have just offered very good support, and we know that Gecko stands by their gear as well. This support fully justifies the slightly higher prices of your American goods, but sometimes it is hard getting that through some thick skulls.

    You Get What You Pay For.

    Cheers
    Roger

  11. #11
    Company Representative
    Join Date
    Feb 2007
    Posts
    942

    Re: Servo only holding/moving in one direction

    Sorry Roger ! ( i read ... Whats the difference between Chinese and American vendors ? ... not.. Thats the difference ,lol )

    I actually don't come here that often as i do most tech support by email.
    But i will be coming more because im starting advertising here again.

    Larry K
    Manufacturer of CNC routers and Viper Servo Drives
    www.LarkenCNC.com and www.Viperservo.com

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