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Interactive Opportunity Assessment Demo and Seminar (Deminar) Series  for Web Labs – PID Control of Slow Valves and Secondary Loops May 12, 2010 Sponsored by Emerson, Experitec, and Mynah Created by Greg McMillan and Jack Ahlers
Welcome ,[object Object],[object Object]
The Latest on Unleashing PID Power for Batch Processes Chapter 3 Features: PID Types and Structures Positive Feedback Integral Mode Dynamic Reset Limiting Cascade Loops Full Throttle Startup Appendix C Features: Unification of Tuning Methods
Question? ,[object Object],[object Object],[object Object],[object Object]
Question? ,[object Object],[object Object],[object Object],[object Object],[object Object]
Top Ten Things You Don’t Want to Hear in a Project Definition Meeting ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Top Ten Things You Don’t Want to Hear in a Project Definition Meeting ,[object Object]
Loop Lab02 Demo 1 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Volume Booster with Integral Bypass (Furnace Pressure and Surge Control Signal from  Positioner Air Supply from Filter-Regulator Air Loading to Actuator Adjustable Bypass Needle Valve
Booster and Positioner Setup (Furnace Pressure and Surge Control) Port A Port B Supply ZZZZZZZ Control Signal Digital Valve Controller Must be functionally tested before commissioning! 1:1 Bypass Volume Booster Open bypass just enough to ensure a non-oscillatory  fast response Air Supply High Capacity Filter Regulator Increase air line size Increase connection size Terminal Box
Loop Lab02 Demo 2 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Ramping Response of Actuator for a Large Step or a Large Actuator Multiply time by 10 for  large actuator without volume booster Time (sec) Stroke (%)
Exponential Response of Actuator for a Small Step or a Small Actuator Stroke (%) Time (sec)
Loop Lab02 Demo 3 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Positive Feedback Implementation of Integral Mode with Dynamic Reset Limit   SP   proportional derivative  Gain     Rate    CO filter filter CV filter Filter Time      Rate Time  filter Filter Time =  Reset Time ER is external reset (e.g. secondary PV) Dynamic Reset Limit ER Positive Feedback
Loop Lab02 Demo 4 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Cascade Control Benefit  (self-regulating process)   i   o   i   o   i   o   i  inner loop process time constant  o  outer loop process time constant  i  inner loop process deadtime  o  outer loop process deadtime
Loop Lab02 Demo 5 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Cascade Control Benefit  (integrating process)   i   o   i   o   i   o   i  inner loop process time constant  o  outer loop process time constant  i  inner loop process deadtime  o  outer loop process deadtime
Loop Lab02 Demo 6 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Effect of Slow Secondary Loop  (cascade control integrating process) Secondary loop slowed down by a factor of 5 Secondary SP Secondary CO Primary PV Secondary SP Primary PV Secondary CO
Loop Lab02 Demo 7 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Top Ten Things Missing in University Courses on Process Control ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Top Ten Things Missing in University Courses on Process Control ,[object Object]
Loop Lab02 Demo 8 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Solutions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Summary of Demos Demo Sec PID Mode Secondary Dynamic Reset Primary Dynamic Reset Valve Slew Rate Secondary Process Response Primary Process Type 1 CAS Disabled Disabled Fast Fast Self-Reg 2 AUTO Disabled Disabled Slow Fast Self-Reg 3 AUTO Enabled Disabled Slow Fast Self-Reg 4 CAS Disabled Disabled Fast Slow Self-Reg 5 CAS Disabled Disabled Fast Slow Self-Reg 6 CAS Disabled Disabled Fast Fast Integ 7 CAS Disabled Disabled Fast Slow Integ 8 CAS Disabled Enabled Fast Slow Integ
Help Us Improve These Deminars! WouldYouRecommend.Us/105679s21/
Join Us May 27, Thursday 1:00 CDT ,[object Object],[object Object],[object Object],[object Object]
QUESTIONS?

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PID Control of Slow Valves and Secondary Loops Greg McMillan Deminar Series

  • 1. Interactive Opportunity Assessment Demo and Seminar (Deminar) Series for Web Labs – PID Control of Slow Valves and Secondary Loops May 12, 2010 Sponsored by Emerson, Experitec, and Mynah Created by Greg McMillan and Jack Ahlers
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  • 3. The Latest on Unleashing PID Power for Batch Processes Chapter 3 Features: PID Types and Structures Positive Feedback Integral Mode Dynamic Reset Limiting Cascade Loops Full Throttle Startup Appendix C Features: Unification of Tuning Methods
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  • 9. Volume Booster with Integral Bypass (Furnace Pressure and Surge Control Signal from Positioner Air Supply from Filter-Regulator Air Loading to Actuator Adjustable Bypass Needle Valve
  • 10. Booster and Positioner Setup (Furnace Pressure and Surge Control) Port A Port B Supply ZZZZZZZ Control Signal Digital Valve Controller Must be functionally tested before commissioning! 1:1 Bypass Volume Booster Open bypass just enough to ensure a non-oscillatory fast response Air Supply High Capacity Filter Regulator Increase air line size Increase connection size Terminal Box
  • 11.
  • 12. Ramping Response of Actuator for a Large Step or a Large Actuator Multiply time by 10 for large actuator without volume booster Time (sec) Stroke (%)
  • 13. Exponential Response of Actuator for a Small Step or a Small Actuator Stroke (%) Time (sec)
  • 14.
  • 15. Positive Feedback Implementation of Integral Mode with Dynamic Reset Limit   SP   proportional derivative  Gain     Rate    CO filter filter CV filter Filter Time   Rate Time  filter Filter Time = Reset Time ER is external reset (e.g. secondary PV) Dynamic Reset Limit ER Positive Feedback
  • 16.
  • 17. Cascade Control Benefit (self-regulating process)  i   o   i   o   i   o   i  inner loop process time constant  o  outer loop process time constant  i  inner loop process deadtime  o  outer loop process deadtime
  • 18.
  • 19. Cascade Control Benefit (integrating process)  i   o   i   o   i   o   i  inner loop process time constant  o  outer loop process time constant  i  inner loop process deadtime  o  outer loop process deadtime
  • 20.
  • 21. Effect of Slow Secondary Loop (cascade control integrating process) Secondary loop slowed down by a factor of 5 Secondary SP Secondary CO Primary PV Secondary SP Primary PV Secondary CO
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  • 27. Summary of Demos Demo Sec PID Mode Secondary Dynamic Reset Primary Dynamic Reset Valve Slew Rate Secondary Process Response Primary Process Type 1 CAS Disabled Disabled Fast Fast Self-Reg 2 AUTO Disabled Disabled Slow Fast Self-Reg 3 AUTO Enabled Disabled Slow Fast Self-Reg 4 CAS Disabled Disabled Fast Slow Self-Reg 5 CAS Disabled Disabled Fast Slow Self-Reg 6 CAS Disabled Disabled Fast Fast Integ 7 CAS Disabled Disabled Fast Slow Integ 8 CAS Disabled Enabled Fast Slow Integ
  • 28. Help Us Improve These Deminars! WouldYouRecommend.Us/105679s21/
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