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  1. #493
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    Default Re: Huanyang VFD Macro/ Plugin

    I think that if the multimeter will show the voltage fluctation depends on the time period of the fluctation.
    If it fluctates fast then the multimeter will likely to show the avarage voltage instead of the numbers moving up and down.
    The 0-24000 RPM if that is the RPM range for the 0-10V input voltage then 1Volt is 2400 RPM and 1000 RPM fluctation is about 0.41 Volts.
    That should be seen on a multimeter if measured on the proper low voltage range and if the voltage is moving slowly enough.
    But if the voltage is changing fast then the multimeter might not show it is why it is better to measure this with an oscilloscope that will show everything.

    It can be that the voltage is really stable but the RPM is still fluctating but that definitely point out a fault of the VFD.



  2. #494
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    Default Re: Huanyang VFD Macro/ Plugin

    I have a video on Youtube that I did last year. The voltage reading on the meter does not change at all, and the RPM will constantly fluctuate, +1000, then -1000. As I said, it takes over 30 seconds for the 2000rpm change, and the voltage is steady the entire time.

    Gerry

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  3. #495
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    Default Re: Huanyang VFD Macro/ Plugin

    30 seconds is a long time. It is likely a VFD problem. But it is also possible that the carrier frequency of the PWM is close the same as the VFD sampling frequency and is a high frequency.
    If the frequency is high the multimeter will not show the fluctation.
    The VFD is measuring in periods and that always shift only a little bit on the PWM so the measured sum voltage and the RPM changes slowly as the measurement slowly walks through the PWM period.
    Without measuring it with an oscilloscope this will remain only a theory though.
    Another thing to try is to change the PWM frequency to see if it makes any difference but that will also likely to give results which could not lead to a final consequence.



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    Default Re: Huanyang VFD Macro/ Plugin

    Quote Originally Posted by OlfCNC View Post
    If the voltage is stable on the analog input of the VFD and the motor RPM is fluctating then the problem is with the VFD, but there is one question that the voltage is really stable?
    How did you measure it? With a multi meter or with an oscilloscope?
    I measured it with a voltmeter.



  5. #497
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    Default Re: Huanyang VFD Macro/ Plugin

    The breakout board converts the PWM to the 0-10V, so the VFD never sees the PWM signal?

    Gerry

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    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


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    Default Re: Huanyang VFD Macro/ Plugin

    Quote Originally Posted by ger21 View Post
    The breakout board converts the PWM to the 0-10V, so the VFD never sees the PWM signal?
    Yes but how well does it convert the PWM?



  7. #499
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    Default Re: Huanyang VFD Macro/ Plugin

    If the multi meter says the voltage is stable, and never changes at all, doesn't that mean it's pretty good?
    My voltage was always accurate to within .01 volts, at any rpm range, and was 100% stable. But the RPM was never stable.

    Gerry

    UCCNC 2017 Screenset
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    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


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    Default Re: Huanyang VFD Macro/ Plugin

    No, because the multimeter shows only one value which is based on measuring a period of time and avaraging that and the time is usually long.
    You can have for example a PWM with 50% dutycyle 0-5 Volts and high frequency which your multimeter will show as a 2.5V DC voltage, because it samples and avarages.
    In regards the analog voltage for the VFD it is possible that the breakout board converts the PWM to analog inperfectly leaving some fluctation on the signal, for example a 4.5V signal with a 1Vpp fluctation on it.
    If the frequency of that fluctation is high enough then your multimeter might not show it to you, but an oscilloscope is.



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    Default Re: Huanyang VFD Macro/ Plugin

    Hi All of you

    Just to inform you, I purchased a new VFD, it was completely plug and play, I did the settings, and ran UCCNC with the allready configured plugin, the spindle rotates rock solid at all given RPM settings.
    Thank you all for your support, and a special thumps up for Dan for making this awsome plugin.

    Regards
    Jan



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    Default Re: Huanyang VFD Macro/ Plugin

    Quote Originally Posted by Tyknok View Post
    Hi All of you

    Just to inform you, I purchased a new VFD, it was completely plug and play, I did the settings, and ran UCCNC with the allready configured plugin, the spindle rotates rock solid at all given RPM settings.
    Thank you all for your support, and a special thumps up for Dan for making this awsome plugin.

    Regards
    Jan
    Hi Jan,

    Your update is very appreciated but unfortunate China stuck you with a bad VFD. I'm sure very little conciliation to you but your bad experience read here can help others.

    Thanks,
    Dan



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