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Contour Move vs Straight Line Move

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Hello, 

 

I am using NI9516 with a Kollmorgan AKD Basic Drive using Analog Control.  I am  able to move it sinusoidal movement with both straight line move and contour move although I think I would like to use contour move.  The problem is with the position move I can make it move exactly 1/4 of a turn if I send it a relative position move of 100 but with the contour move if I create a sign wave of 100 amplitude it moves slightly (~60deg I don't know exactly) more than a quarter of a turn.  

 

What am I doing wrong? 


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