Trying to set up position control mode

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7 months 3 weeks ago #343914 by jblanscett
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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7 months 3 weeks ago #343915 by PCW
OK so that may still be an electrical/wiring  issue

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



 

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7 months 3 weeks ago #343916 by jblanscett
Okay, is there a way to verify that it is an electrical/wiring issue?

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7 months 3 weeks ago #343917 by PCW
Might look at the step pulse train with an oscilloscope.

Also is it possible the servo drive is not set to position mode?
 

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7 months 3 weeks ago #343940 by jblanscett
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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7 months 3 weeks ago #343941 by PCW
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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7 months 3 weeks ago #343949 by jblanscett
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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