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IndustryArena Forum > CNC Electronics > Gecko Drives > DC servo hot plus strange ringing noise
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  1. #1
    Join Date
    Sep 2004
    Posts
    235

    DC servo hot plus strange ringing noise

    Hi

    I have a new motor running and its powered by the older 320 Gecko.
    Both the old and the new motor produce a ringing noise and heat issues.
    I did a test by removing the timing belt and running some g code for 20 minutes.
    Even with the motor not under load the motor is getting warner. The z and x are
    always cold to the touch. But the y axis is doing most of the work in my g code so
    it’s working harder.
    Here is a note regarding my setup. The power wires look to be a 18 gauge or even
    smaller. I am ordering new larger wire and hope this will help.

    PS. Here is a video of the machine running. Every 50 seconds I hear a ringing from the
    servo motor. My ears tell me it’s the motor in question making the noise. I don`t know
    enough about servos to tell if that ringing is normal.

    The ringing occurs at 0.14 and .031 in the video.
    The drive reduction on my machine is 3:1.
    https://www.youtube.com/watch?v=4fFJ...ature=youtu.be


    Regards Barry

  2. #2
    Join Date
    Jun 2010
    Posts
    4252

    Re: DC servo hot plus strange ringing noise

    Could be that your motor is verging on oscillating. Go through the Gecko tuning instructions and reduce the PID settings a bit.
    If I'm correct, that will cut down the heating as well.

    Cheers
    Roger

  3. #3
    Join Date
    Jul 2014
    Posts
    39

    Re: DC servo hot plus strange ringing noise

    Hi Roger
    I never thought I`d get an answer. Thanks so much for taking the time to reply.

  4. #4
    Join Date
    Dec 2003
    Posts
    24216

    Re: DC servo hot plus strange ringing noise

    An off load motor should not make that noise and especially a DC brushed motor is usually very quiet.
    Can you see exactly what the motor does when it makes that noise?
    Could be excess gain, this is often audible when the motor is stationary.
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

  5. #5
    Join Date
    Feb 2007
    Posts
    962

    Re: DC servo hot plus strange ringing noise

    It sounds like there may be debris in the motor, or a vibrating brush or bad bearing is making that noise.
    Pull the brushes out and examine them.
    Manufacturer of CNC routers and Viper Servo Drives
    www.LarkenCNC.com and www.Viperservo.com

  6. #6
    Join Date
    Jan 2005
    Posts
    15362

    Re: DC servo hot plus strange ringing noise

    bgolash

    Sounds like a Bearing on it way out, the Bearing cage is skidding making the noise, you are hearing
    Mactec54

  7. #7
    Join Date
    Jun 2010
    Posts
    4252

    Re: DC servo hot plus strange ringing noise

    Yeah, after listening a second time, I think I would go for the mechanical failure myself too. $$

    Cheers

  8. #8
    Join Date
    Jul 2014
    Posts
    39

    Re: DC servo hot plus strange ringing noise

    Hi
    I have a new power supply that I wanted to test. I wired up the servo that had the noise. Ran the
    servo and no strange noise at all. Does this tend to mean it could be a tuning issue. The test did NOT
    include the motor connected to the 320 Gecko. Also both the new and the old motor are making the
    same noise when I run G code. I assume again its a tuning or EMI interference problem.

  9. #9
    Join Date
    Dec 2003
    Posts
    24216

    Re: DC servo hot plus strange ringing noise

    It appears to be a DC brushed servo, so try it on a fixed DC supply if possible, an automotive battery is one such source.
    If no such noise, then it points to tuning.
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

  10. #10
    Join Date
    Feb 2007
    Posts
    962

    Re: DC servo hot plus strange ringing noise

    Quote Originally Posted by Novett View Post
    Hi
    I have a new power supply that I wanted to test. I wired up the servo that had the noise. Ran the
    servo and no strange noise at all. Does this tend to mean it could be a tuning issue. The test did NOT
    include the motor connected to the 320 Gecko. Also both the new and the old motor are making the
    same noise when I run G code. I assume again its a tuning or EMI interference problem.
    Are you taking about the same motor as the OP, bgolash ? Or is this a different problem.
    Manufacturer of CNC routers and Viper Servo Drives
    www.LarkenCNC.com and www.Viperservo.com

  11. #11
    Join Date
    Jun 2010
    Posts
    4252

    Re: DC servo hot plus strange ringing noise

    I have a new power supply that I wanted to test. I wired up the servo that had the noise. Ran the
    servo and no strange noise at all. Does this tend to mean it could be a tuning issue. The test did NOT
    include the motor connected to the 320 Gecko. Also both the new and the old motor are making the
    same noise when I run G code. I assume again its a tuning or EMI interference problem.
    I'm sorry, but I could make very little sense out of what you have written.
    I was under the impression that it was a motor which was making the noise, not the servo.
    Are you saying that the test you ran with your new PS included just the PS and the Gecko, but no motor? Or what?
    I'm confused.

    Cheers
    Roger

  12. #12
    Join Date
    Jul 2014
    Posts
    39

    Re: DC servo hot plus strange ringing noise

    Its the same problem. Its a servo motor DC brush type.
    To test the old motor it was attached to a new power supply.
    The encoders were not used. Nor was it attached to a 320 Gecko.
    I assume I should have mentioned I was bench testing the old motor.

  13. #13
    Join Date
    Feb 2007
    Posts
    962

    Re: DC servo hot plus strange ringing noise

    Quote Originally Posted by RCaffin View Post
    I'm sorry, but I could make very little sense out of what you have written.
    I was under the impression that it was a motor which was making the noise, not the servo.
    Are you saying that the test you ran with your new PS included just the PS and the Gecko, but no motor? Or what?
    I'm confused.

    Cheers
    Roger
    Me too... Is Novett ,bgolash they guy who posted the video ? Huh ?
    Manufacturer of CNC routers and Viper Servo Drives
    www.LarkenCNC.com and www.Viperservo.com

  14. #14
    Join Date
    Jun 2010
    Posts
    4252

    Re: DC servo hot plus strange ringing noise

    Hi Novett

    I am still a bit confused. You keep leaving out half the essential details: without them no-one can help you.

    > I have a new power supply that I wanted to test. I wired up the servo that had the noise.
    Normally the word 'servo' would refer to a servo drive such as the Gecko 320X. Are you instead referring to a DC motor when you talk about a 'servo'?

    If what you are saying is that running the motor straight off a DC PS does not make the same noise, then it is reasonable to assume that the Gecko 320X may be causing the noise in the motor. Yes, a DC brush motor can make quite a noise if driven by a supply with lots of oscillation on it. That then may be a servo (drive) tuning problem.

    But not always. You haven't told us what sort of PS you are using. My spindle motor was very noisy when driven by an SCR-based servo drive; switch to a MOSFET-based servo drive and it was quiet. But I don't think that will be happening here.

    Cheers
    Roger


    Cheers

  15. #15
    Join Date
    Aug 2014
    Posts
    889

    Re: DC servo hot plus strange ringing noise

    Having viewed the video for the first time, their isn't enough info to go along to diagnose the problem.
    First are you using a constant dc supply like a battery or are you feeding it commands through the Geckos? That makes a huge difference when trying to figure out if it's a mechanical problem.
    If it was commanded motion then you have to look into tuning as it sounds like too much gain. The banging sounds, was that when it is reversing? Hard to tell.
    DC servos are usually quiet. If it was SCR driven, you would hear that constant annoying hum, so for sure he's not using that.

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