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FIGURE 9.1 Control of temperature by process control. Curtis Johnson Process Control Instrumentation Technology, 8e] Copyright ©2006 by Pearson Education,

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Presentation on theme: "FIGURE 9.1 Control of temperature by process control. Curtis Johnson Process Control Instrumentation Technology, 8e] Copyright ©2006 by Pearson Education,"— Presentation transcript:

1 FIGURE 9.1 Control of temperature by process control. Curtis Johnson Process Control Instrumentation Technology, 8e] Copyright ©2006 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved.

2 FIGURE 9.2 The error detector and controller. Curtis Johnson Process Control Instrumentation Technology, 8e] Copyright ©2006 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved.

3 FIGURE 9.3 Two-position controller action with neutral zone. Curtis Johnson Process Control Instrumentation Technology, 8e] Copyright ©2006 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved.

4 FIGURE 9.4 Figure for Example 9.4. Curtis Johnson Process Control Instrumentation Technology, 8e] Copyright ©2006 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved.

5 FIGURE 9.5 Three-position controller action. Curtis Johnson Process Control Instrumentation Technology, 8e] Copyright ©2006 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved.

6 FIGURE 9.6 Relationship between error and three-position controller action, including the effects of lag. Curtis Johnson Process Control Instrumentation Technology, 8e] Copyright ©2006 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved.

7 FIGURE 9.7 Single-speed floating controller as shown in: (a) single-speed controller action as the output rate of change to input error, and (b) an example of error and controller response. Curtis Johnson Process Control Instrumentation Technology, 8e] Copyright ©2006 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved.

8 FIGURE 9.8 Multiple-speed floating mode control action. Curtis Johnson Process Control Instrumentation Technology, 8e] Copyright ©2006 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved.

9 FIGURE 9.9 Single-speed floating-control action applied to a flow-control system. Curtis Johnson Process Control Instrumentation Technology, 8e] Copyright ©2006 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved.

10 FIGURE 9.10 The rate of controller output change has a strong effect on error recovery in a floating controller. Curtis Johnson Process Control Instrumentation Technology, 8e] Copyright ©2006 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved.

11 FIGURE 9.11 The proportional band of a proportional controller depends on the inverse of the gain. Curtis Johnson Process Control Instrumentation Technology, 8e] Copyright ©2006 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved.

12 FIGURE 9.12 An offset error must occur if a proportional controller requires a new zero-error output following a load change. Curtis Johnson Process Control Instrumentation Technology, 8e] Copyright ©2006 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved.

13 FIGURE 9.13 Level-control system for Example 9.6. Curtis Johnson Process Control Instrumentation Technology, 8e] Copyright ©2006 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved.

14 FIGURE 9.14 Integral mode controller action: (a) The rate of output change depends on error, and (b) an illustration of integral mode output and error. Curtis Johnson Process Control Instrumentation Technology, 8e] Copyright ©2006 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved.

15 FIGURE 9.15 Illustration of integral mode output and error, showing the effect of process and control lag. Curtis Johnson Process Control Instrumentation Technology, 8e] Copyright ©2006 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved.

16 FIGURE 9.16 The error can be zero but the rate of change very large. Curtis Johnson Process Control Instrumentation Technology, 8e] Copyright ©2006 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved.

17 FIGURE 9.17 Derivative mode controller action changes depending on the rate of error. Curtis Johnson Process Control Instrumentation Technology, 8e] Copyright ©2006 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved.

18 FIGURE 9.18 Proportional-integral (PI) action showing the reset action of the integral contribution. This example is for reverse action. Curtis Johnson Process Control Instrumentation Technology, 8e] Copyright ©2006 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved.

19 FIGURE 9.19 Overshoot and cycling often result when PI mode control is used in start-up of batch processes. The dashed lines show the proportional band. Curtis Johnson Process Control Instrumentation Technology, 8e] Copyright ©2006 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved.

20 FIGURE 9.20 Solution for Example 9.8. Curtis Johnson Process Control Instrumentation Technology, 8e] Copyright ©2006 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved.

21 FIGURE 9.21 Proportional-derivative (PD) action showing the offset error from the proportional mode. This example is for reverse action. Curtis Johnson Process Control Instrumentation Technology, 8e] Copyright ©2006 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved.

22 FIGURE 9.22 Solution for Example 9.9. Curtis Johnson Process Control Instrumentation Technology, 8e] Copyright ©2006 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved.

23 FIGURE 9.23 The three-mode controller action exhibits proportional, integral, and derivative action. Curtis Johnson Process Control Instrumentation Technology, 8e] Copyright ©2006 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved.

24 FIGURE 9.24 Solution for Example Curtis Johnson Process Control Instrumentation Technology, 8e] Copyright ©2006 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved.

25 FIGURE 9.25 Figure for Problems 9.7 and Curtis Johnson Process Control Instrumentation Technology, 8e] Copyright ©2006 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved.

26 FIGURE 9.26 Figure for Problems 9.12 to Curtis Johnson Process Control Instrumentation Technology, 8e] Copyright ©2006 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved.


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