Trying to set up position control mode

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05 Mar 2026 18:45 #343914 by jblanscett
Replied by jblanscett on topic Trying to set up position control mode
DRO updates to the inputed position about a second after .1 inches is inputted and the motor continues after that. The DRO doesn't update again until another input is entered. 

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05 Mar 2026 18:59 #343915 by PCW
Replied by PCW on topic Trying to set up position control mode
OK so that may still be an electrical/wiring  issue

(if the DRO does not move but the motors move)



 

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05 Mar 2026 19:18 #343916 by jblanscett
Replied by jblanscett on topic Trying to set up position control mode
Okay, is there a way to verify that it is an electrical/wiring issue?

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05 Mar 2026 19:56 - 05 Mar 2026 20:58 #343917 by PCW
Replied by PCW on topic Trying to set up position control mode
Might look at the step pulse train with an oscilloscope.

Also is it possible the servo drive is not set to position mode?
 
Last edit: 05 Mar 2026 20:58 by PCW.

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06 Mar 2026 13:12 #343940 by jblanscett
Replied by jblanscett on topic Trying to set up position control mode
What should I be looking at with the oscilloscope? I have checked that our signal looks like it is supposed to and when I press the continuous jog, it stops about when I release the continuous jog and the motor keeps spinning.

We went through a back and forth with Yaskawa before this to confirm it is in position mode, because that was our first thought. What I don't really understand is how the 7i95 board knows it is supposed to generate position based step generation when we are sending it velocity commands? 

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06 Mar 2026 14:29 #343941 by PCW
Replied by PCW on topic Trying to set up position control mode
If the motor keeps turning without step pulses, this is a root of the problem
and there's nothing on the LinuxCNC/7I95 side that can fix this.

It really sounds like the drive is in velocity mode.

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06 Mar 2026 18:47 #343949 by jblanscett
Replied by jblanscett on topic Trying to set up position control mode
Okay, we will try to confirm that it is our servopack.

Does anybody have experience with position control mode on the SGDH-10AE or another Yaskawa sigma II series servopack?

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