Yazzoom Production Process Improvement
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​APPLYING D-ACTION TIPS AND TRICKS

WHEN DO YOU APPLY D-ACTION? TIPS AND TRICKS FROM YAZZOOM

Would this PID control loop benefit from D-action or not? Every process control operator or engineer has probably asked himself this question several times during his career. Here are some tips and tricks that will assist everyone who has to deal with this question.
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Within a PID controller, the derivative action determines the level of anticipation based on the past history. This means that derivative action reacts on large changes in either the process variable or the control error, depending on the PID equation that is used. Using derivative action can be beneficial when the process has long dead times, especially when the ratio of (dead time / time constant) > 1.5. Applying such a D-action results in three important changes for the control loop in such circumstances: the error magnitude will reduce and the oscillation period will decrease. These results are also clearly visible in the figure.
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Picture
Furthermore, it can be useful to low-pass filter the process variable in order to avoid excessive movement of the control output and hence of the control valve. However, another reason to use D-action can be in case the control valve suffers from stiction but cannot be repaired or replaced yet: in this case the more dynamic control output as a result of the D-action will help to keep the valve responsive, and in this case you will rather want to limit the amount of filtering on the signal.
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If you have more questions or are if you want to know what Yazzoom can do for you, please contact us at info@yazzoom.com

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  • Home
  • Products
    • YASENSE Excel - Solution for deploying Excel models in Production
    • PITOPS - System Identification, PID tuner and APC Simulation and Optimization Software
    • SIMCET - Simulation software for PID control tuning practice and skills testing
    • APROMON - Control Loop Performance Monitoring Software
    • PIPROMASTER - Computer Based Training on Process Control
    • YASENSE - Software tool suite for soft sensor development, integration and monitoring
  • Services
    • PID Consulting Services
    • Advanced Process Control
    • Soft Sensor Development
    • Automatic Inspection and Sorting
    • Smart Supervisory Machine Vision
    • Production Analytics
  • Training
    • Classroom training >
      • PID 100: PID tuning Classroom Training
      • APC 200: APC & PID classroom training
      • MON 300: CLPM Classroom training
    • Online training >
      • PID 100: PID tuning training
      • APC 200: Advanced Process Control Training & Training on PID tuning
      • MON 300: Control Loop Monitoring Training
      • Other Online Training Courses
    • Computer Based Training
    • Simulation software for PID control tuning practice and skills testing
  • Industries & Applications
    • Condition Based Maintenance
    • Air Separation
    • Electromechanical Equipment >
      • PID Tuning For High Speed Rotating Equipment
    • PetroChemical >
      • PID Tuning For Petrochemicals
      • PID Tuning For Polymer Plants
    • Power Generation >
      • PID Tuning for Power Plants
    • Pulp & Paper
    • Other industries >
      • PID Tuning and APC For Pharmaceutical
      • PID Tuning and APC For Cement
      • PID Tuning and APC for Mining and Resources
  • Company
    • About Us
    • News
    • Jobs
  • Contact