After preliminary design of a feedback compensator, it may be necessary to fine-tune the characteristics of the compensator. Moreover, in a system that contains multiple compensators, you may want to modify a particular compensator in isolation.
To modify a compensator block
1. Select the plant transfer function block.
2. Choose Analyze > Select Compensator Block and click the compensator block to be modified.
3. Click on empty screen.
4. Choose Analyze > Compensator Design.
5. Make the desired changes in the Compensator Design dialog.