ac servo moving a bit by hand when enabled

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05 May 2020 23:39 #166819 by bevins
Hi all,

I have a CNC that is having a problem. One AC servo on it I can move it by hand by pushing on the axis. It moves a little bit. I can see it in the cuts as there are some waves. I dont know if this is a bad servo or just poorl;y tuned. If I jack up the P in the pid would that help? The P is at 30. This is a 1.8kw Yaskawa ac servo with a CACR servopack also Yaskawa

It is running a 5i25-7i77 and a couple more cards. I though about the drive, but there are no errors on the drive.

What should I look atÉ Jacking the P to see if it tightens up?

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06 May 2020 12:08 #166867 by andypugh
Yes, this does sound like an under-tuned drive. You might need more P and more I.

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