This basic control theory tutorial looks at on/off and continuous control modes. It introduces proportional, integral and derivative control actions and explains some of the terminology. Courtesy of Spirax Sarco and Mountain States Engineering and Controls.Topics Include:
- On/off control
- Continuous control
- Proportional control
- The effect of adjusting the Proportional-band
- Reverse or direct acting control signal
- Gain line offset or proportional effect
- Manual reset
- Overshoot and ‘wind up’
- Derivative control - rate action
- PID controllers
- Hunting
- Lag
- Rangeability
- Turndown ratio
