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Author Topic: VFD RPM control wiht Pokey57CNC 1-10V output does not propperly work  (Read 4786 times)

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Re: VFD RPM control wiht Pokey57CNC 1-10V output does not propperly work
« Reply #10 on: January 18, 2020, 12:45:08 AM »
I don't know if anyone is still reading this one, probably not; however, I just wanted to say that the solution above works great.

I had a similar problem, when under no load I was able to check the 0-10v Analogue voltage out and it mapped perfectly as expected. When the spindle (in my case a servo) was connected and turned on it would only match for the first few hundred RPM (10v = 2500 rpm) and then would essentially pause at 5-600 rpm with lots of spindle speed fluctuation. I was ripping my hair out trying to solve it and found this post.

I installed a ferrite tube on + and - wires approx 1/3 along the wire length from the pokeys board; the tube was 8mm ID, approx 25mm long and I did 14 turns through the tube (as many as I could fit in, I probably could have pushed for another two but didn't want to break anything). I additionally installed a 22nF capacitor (0.022uF) across the wires at the board.

Now it works like a treat, rock steady RPM (the servo drive provides a real time RPM output from the encoder) with no noticeable fluctuations. Accuracy to target RPM within 2 RPM, I might be able to calibrate that out, but I think it is fine....

Thanks for posting your solution up here and if anyone has similar symptoms to either of us two, this method works! (total cost about $8AUD for parts, and I have 4 ferrite tubes left over).

Cheers

Offline Tweakie.CNC

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Re: VFD RPM control wiht Pokey57CNC 1-10V output does not propperly work
« Reply #11 on: January 18, 2020, 02:57:37 AM »
Hi Mattceng,

Thanks for taking the time and posting your solution to the problem (and confirming the Exflueger solution).

Information such as this is always helpful for others that follow.

Tweakie.
PEACE
Re: VFD RPM control wiht Pokey57CNC 1-10V output does not propperly work
« Reply #12 on: February 06, 2020, 04:28:42 AM »
:-)
And it still works.