Rockwell Automation 2090 Ultra3000 Servo Drives Integration Manual - Manual (Page 152)

Publication 2098-IN005C-EN-P — March 2008
152 Minimizing the Effects of Feedback Signal Loss
9. Enter values (in counts) in the Scale and a Offset fields that results
in the entire periodic Position Error signal waveform visible in the
oscilloscope window.
Steps 8 and 9 are purely for the purpose of visualization. Fixing
the vertical scale of the oscilloscope window lets you observe the
amplitude excursion limits of the Position Error signal from a fixed
range of reference.
10. Repeat steps 1…6 for Channel B and view the Velocity Error
signal.
Access the Velocity Error signal in the Velocity Signals group in the
same Channel Options pull-down menu. Make sure to use the
Auto scale setting for Channel B. Both signals should be visible in
the main oscilloscope window. You can toggle between
Channel A and Channel B on the y-axis scale with the y-axis
Labels field pull-down menu.
Using the Trigger Feature
The bottom-right portion of the screen contains trigger level settings
for oscilloscope Channel A and B. You can specify the level settings,
in interpolated drive counts, to trigger on actual Position Error signal
amplitude levels. You can use the trigger feature to capture significant
Position Error amplitude events during normal system operation and
to get very accurate application excursion limits. Using the trigger
feature is an alternative to visually extracting the Position Error
excursion limits.