11. A basic Control Loop Diagram is shown in Table 1. 12. It has been well documented that over 35 % of control loops typically have problems. 13. This would cause poor transient response in the control loop due to low phase margin. 14. The Control Loop Diagram provides a vehicle for the CFA Loop to be used effectively. 15. For each control loop to run optimally, identification of sensor, valve, and tuning problems is important. 16. This control loop is designated the force-rebalanced mode. 17. If the control loop is not properly designed and tuned, the process runs below its optimum. 18. Another method used in control loop theory uses Bode plots of gain and phase vs . frequency. 19. The controllers can be freely parameterized and can thus be adapted to any type of control loop . 20. Allosteric regulations are a natural example of control loops , such as cell's ability to adjust enzyme activity.
