Control strategy and PID
Цель: Изучить тему «Control strategy and PID» и закрепить её практическими заданиями и самопроверкой.
2 акад. часа чтение и разбор теории, решение задач, работа со схемой или виртуальным стендом и проверка понимания.
Основной материал
Temperature loop manipulates steam valve. Secondary steam flow loop may be added as cascade if pressure disturbance significant. Level during fill can use on/off or modulating valve depending process. pH control may use dosing and requires consideration dead time/mixing.
Tuning plan
Do not invent PID constants before process response. Commission in manual, perform safe step test, identify gain/tau/dead time, choose conservative starting tuning, validate disturbances and limits.
Practical deliverable
Write control narrative for temperature: modes, SP range, controller action, output limits, valve fail position, alarms, cascade option, behavior on bad PV.
Что нужно запомнить
- Secondary steam flow loop may be added as cascade if pressure disturbance significant.
- Level during fill can use on/off or modulating valve depending process.
- pH control may use dosing and requires consideration dead time/mixing.
- Commission in manual, perform safe step test, identify gain/tau/dead time, choose conservative starting tuning, validate disturbances and limits.
- Write control narrative for temperature: modes, SP range, controller action, output limits, valve fail position, alarms, cascade option, behavior on bad PV.