User`s guide

8 The Root Locus Design GUI
8-28
The default mode for the toolbar is the drag mode. In this mode, you can:
• Click on a specific location on the root locus to place a closed-loop pole there
(and consequently reassign the gain set point).
• Drag any of the closed-loop poles along its branch of the root locus (also
reassigning the gain set point).
• Drag any of the compensator poles or zeros around the complex plane to
change the compensator.
To add a complex conjugate compensator pole pair on the root locus plot:
1 Select the add pole button (the second button in the root locus toolbar).
2 Click onthe plotregion whereyou wouldlike to addone ofthe complexpoles.
Some of the features of using the root locus toolbar to add a pole are:
• While the add pole button is depressed, the cursor changes to an arrow with
an
x at its tip whenever it is over the plot region. This indicates the toolbar
is in the “add pole” mode.
• After you add the poles, the add pole button pops b ack up and the default
drag mode is restored. The added compensator poles appear in a different
color. The default color is red.
• The LTI Viewer response plots change as soon as the pole is added.
• The text displayed in the
Current Compensator region of the GUI now
displays the new pair of poles.