I have recently learned the concept of override control in the p&id diagram. I have also learned some typical examples but whenever i come across a new complicated override control I find it difficult to interpret and identify the two selected and de selected controlls.
Dear Nayab Nasir,
Generally in the override control arrangement we place at least two controllers, a normal controller and the override controller. The selection of the controller is determined by a constraint defined a priori. Such a device is made to ensure more security and availability of operation of the process.
For more details and information about this subject, i suggest you to see links and attached files on topic.
https://fr.slideshare.net/AshvaniShukla/override-control-system
https://www.tetranex.com/process-controls-primer-part-2/
https://instrumentationtools.com/determining-design-purpose-override-controls/
Best regards
This is more of an industrial automation question than a controls theory question. Typically, override control is used in simple industrial control application when 2 SISO controllers share the same actuator. Identifying the selected controller at each point in time, requires knowledge about the selector knowledge. For example, if the selector logic is simply "
- Badges
- Science topic
- Similar topics
- Engineering
- Instrumentation Engineering