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Description
A controller is used to drive a monitored variable to a target value by modifying the value of the controlled variable. Controllers are wrapped using a sequencer, so the controller is allways run after its monitored value is updated and allways before its controlled value is used.
Simple Control
- The steam flow is adjusted to control temperature.
- Click on the sequencer to see the sequence of running the equipments.
- To set the properties, select the controller equipment, right click on it, and select Properties.
- Select Temperature at the Monitored Data Item. Check the box Proportional to Controlled Data Item.
- Set Value to 100.
- Set the Controlled Data Item on Total Flow.
- Press Ok.
- Press on Run to run the controller.
Using a Sensor for the Monitored Value
- Water flow is adjusted to control solids fraction.
- The SF_Sensor calculates solids fraction so the controller can monitor the sensor's value. Sensors can be used for the monitored value but not for the controlled value.
- To set the properties, select the controller equipment, right click on it, and select Properties.
- Select Value at the Monitored Data Item. Set Value to 0.3.
- Set the Controlled Data Item on Total Flow.
- Press Ok.
- Press on Run to run the controller.
Setting the Target Value by Reference
- Steam flow is adjusted to control temperature.
- Target value is set equal to the temperature of the Stream S111.
- To set the properties, select the controller equipment, right click on it, and select Properties.
- Select Temperature at the Monitored Data Item. Set the Controlled Data Item on Total Flow.
- Set Temperature on Target Data Item.
- Press Ok.
- Press on Run to run the controllers.