How Do I Do High Precision Moves With the NI 9514?

Updated May 3, 2018

Reported In

Hardware

  • NI-9514

Software

  • LabVIEW SoftMotion Module

Issue Details

The minimum angle of rotation with my drive is orders of magnitude larger than it should be. Using a Position Move in LabVIEW, if I move to a position equal to 1, and then a position equal to 2, the angle between those points is larger than it should be.

I also cannot make fractional steps. And if I change the Counts Per Unit in Encoder Properties, that just changes the number I have to put into LabVIEW, but doesn't actually help the precision of my step size.

Solution

Not getting the full precision of your drive is usually a problem with tuning. You need to check the PID tuning parameters. After adjusting those properly, you should see the angles of your movements changing.

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