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Control loops configuration

Control loops configuration. Control loop - a principle measure data processing control action computing control action execution alarms processing fault blocking operator interface program modules LINEX, FLPV, PID, LEAD/LAG... Module parametrisation.

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Control loops configuration

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  1. Control loops configuration • Control loop - a principle • measure • data processing • control action computing • control action execution • alarms processing • fault blocking • operator interface • program modules • LINEX, FLPV, PID, LEAD/LAG... • Module parametrisation

  2. Control loops configuration - continued • program structure • module I/O specification • no programming, but configuration • pre-programmed functions; they are tested • reliability • safety • accelerated test; integration test only • standard validated configuration copy...

  3. Typical control loops • The most frequently configured loops are • single control • cascade control • feed - forward control • ratio control

  4. Single control loop • Backward control loop • process variable PV (controlled) • Set Point SP • deviation = SP - PV or PV - SP • control action OUTPUT • control parameter P, Ti, Td, GAP...

  5. Cascade control loop • Two PID control loops • master control loop • slave control loop • Set Point of slave loop • slave eliminates a non - linearity of control actuator and subsystem as well, PI controller, slave gain = 1 • master operates a linear system in steady state

  6. Feed forward control • Disturbance • Control action compensation • feed forward on output • feed forward on Set Point • direct control action - improved stability of control process • feed forward signal • Dynamic compensation • LEAD/LAG, DTIME

  7. Ratio control • Ratio control applications • mixture technologies - mix reactors, Coca Cola... • Set Point control (air condition...) • Principle • master variable - uncontrolled, random variable • slave variable - controlled variable • steady state: the ratio is correct • dynamic mode: no correct ratio value

  8. Single loop configuration • Hot water exchanger

  9. Single loop configuration • Hot water exchanger

  10. Cascade loop configuration • Hot water exchanger

  11. Cascade loop configuration • Hot water exchanger

  12. Feed forward control • Hot water exchanger

  13. Feed forward control • Hot water exchanger

  14. Ratio control • Materials mixing

  15. Ratio control • Materials mixing

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