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PVT mode - "Jittery" motion
#1
Hello,

I'm quite new to PMAC so pardon my ignorance. I need to run two axes of my gantry system in a loop.

I'm trying to use PVT mode in the motion program. My code is attached. I have blending enabled (Isx92 = 0) and segmentation time 5ms (Isx13).

When I run the program the axes motion is jittery, as if the motor stops after every commanded point. Am I missing something?

Any help on how to fix this will be greatly appreciated.

Thank you!


Attached Files
.pdf   UY.pdf (Size: 41.7 KB / Downloads: 19)
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#2
Attached data points and plots for easier reference.


Attached Files
.pdf   UYmotion.pdf (Size: 192.17 KB / Downloads: 19)
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#3
The most common mistake beginners make in PVT mode is to get the velocity units wrong.

The value after the colon specifies the ending velocity in [axis units per (Isx90 milliseconds)].

At the default value for Isx90 of 1000, this is axis units per second.

The time for the move is always specified in milliseconds.
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#4
Got it. I corrected the velocity and it works well.

Thanks for the help!

(07-27-2017, 09:57 AM)curtwilson Wrote: The most common mistake beginners make in PVT mode is to get the velocity units wrong.

The value after the colon specifies the ending velocity in [axis units per (Isx90 milliseconds)].

At the default value for Isx90 of 1000, this is axis units per second.

The time for the move is always specified in milliseconds.
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