Guidelines for Setting Filter and Module Execution Rate
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The is a recording of a presentation given at Emerson Exchange 2010. Basic guidelines are presented on how to set filtering to avoid aliasing. Also, information is provided on how to set control execution rate to achieve best performance.
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Guidelines for Setting Filter and Module Execution Rate
- 1. Guidelines for Setting Filtering and Module Execution Rate Terry Blevins Principal Technologist
- 5. A/D FIR Filter – 50-60 Hz Attenuation
- 7. Example – Process Noise
- 8. Example – Process Noise
- 13. Example: Impact of Filtering (Cont)
- 14. Example: Impact of Filtering Process Gain=1 , TC=4 sec, DT=1 sec * Time to return within 2% of setpoint . PID Tuning Setpoint Change Load Disturbance Tuning Method Filtering as % of Response Time Gain Reset Rate Response* Time (sec) Overshoot (%) Recovery* Time (Sec) Max Dev (%) Typical PI No Filtering 1.13 3.5 - 7 0.2 11 6 10% 0.92 4.8 - 11 - 16 7.2 30% 0.90 6.7 17 - 22 7.7 60% 0.93 8.9 - 23 - 27 7.6 120% 1.06 11.8 - 19 - 33 7.0 Lambda λ =1.5 No Filtering 0.6 4.5 - 18 - 23 10.3 10% 0.47 6.5 - 34 - 40 11.9 30% 0.44 9.2 53 59 12.8 60% 0.47 12.3 - 67 - 74 12.8 120% 0.52 16.9 - 83 - 93 12.1
- 17. Example: Control Execution - Rule 3 Module Execution Impact - Process Gain=1 , TC=3 sec, DT=1 sec PID Tuning Setpoint Change Load Disturbance Tuning Method Module Period Gain Reset Rate Response* Time (sec) Overshoot (%) Recovery* Time (Sec) Max Dev (%) Typical PI 0.2 sec 0.89 3.3 - 7 - 12 10 0.5 sec 1.01 3.9 - 9 - 14 10 1 sec 1.31 5.4 12 - 16 10 2 sec 1.0 14.3 - 47 - 53 12 5 Sec 0.22 22 - 316 - 310 15
- 18. Example: Control Execution - Rule 3 (Cont)
- 19. Example: Control Execution - Rule 4 Module Execution Impact - Process Gain=1 , TC=2 sec, DT=2 sec PID Tuning Setpoint Change Load Disturbance Tuning Method Module Period Gain Reset Rate Response* Time (sec) Overshoot (%) Recovery* Time (Sec) Max Dev (%) Typical PI 0.5 sec 0.49 3.2 - 16 - 20 15 1 sec 0.57 4.5 - 23 - 27 15.3 2sec 0.6 7.0 38 - 42 16.9 5 sec 0.21 22 - 316 - 330 18 10 Sec 0.12 0.44 - >600 - >600 19
- 20. Example: Control Execution - Rule 4 (Cont)