Huanyang VFD Macro/ Plugin - Page 42

# Thread: Huanyang VFD Macro/ Plugin

1. ## 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. ## 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.

3. ## 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.

4. ## Re: Huanyang VFD Macro/ Plugin

Originally Posted by OlfCNC
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. ## Re: Huanyang VFD Macro/ Plugin

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

6. ## Re: Huanyang VFD Macro/ Plugin

Originally Posted by ger21
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. ## 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.

8. ## 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.

9. ## 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

10. ## Re: Huanyang VFD Macro/ Plugin

Originally Posted by Tyknok
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

Hi Dan911,
PM Sent.

12. ## Re: Huanyang VFD Macro/ Plugin

Hi Dan great plugin and thanks for all your hard work, I have it running in uccnc and the 2017 Screen set. I do have 1 question and that is when I increase my speed with either the plus symbol or the slider it maxes out at 18000, my max is set to 24000 for a 2.2kw water cooled spindle. I can s command it to 24000 and it goes there so I'm just wondering if that's normal. Thanks in advance!

Best Regards,
Bob

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