- What does PID mean? (Be specific, don’t just define the Three Letter Acronym) Acronym: P=Proportion or gain applied to error to assist in overcoming the deviation.
I= Proportion or gain over time applied to error to assist in returning to setpoint.
D= The amount of gain over time needed to overcome large upsets or deviation from setpoint
2.PID is normally used for three-mode control. What does this mean?
This means that all 3 modes, proportional, Integral and Derivitive are used in tuning a control loop for optimum results.
3.What is a cascade loop?
Cascade loop is: Where the output of one controller is fed to the setpoint of another controller optimum control.
4.What is meant by the term setpoint?
The setpoint is: the desirable controlled value
5.What is a single loop controller
Single loop means: Has one input, controller and output in a closed loop.
- Discuss the interrelationship between SP, PV and Output.?
SP is the: Is the desired process variable
PV is the: Is the actual process variable
Output is the: Is the applied variable to bring the PV equal to the SP
7.What is a marshalling panel?
Marshalling Panels provide: Coordinated location for field terminations in rack room to then connect to process equipment.
- In process control, what is the function of a transmitter?
A transmitter: a measured variable from a primary element to provide a scalable PV
9.What is meant by the term 4 to 20?
This is a: Is a common medium in milliamps to transfer analog values
10.What is an RTD?
That is a precision temperature primary element using resistance.