This presentation is about P, PI, and PID controller.

2. Definition of controller
Rule of controller
Function of controller
Types of controller
Details of some controller
1
2
3
4
5
6 Applications
Contains

3. Receives data from a
measurement instrument
Compares that data to a
programmed set point
And if necessary, signals a
control element to take
corrective action.

4. Controller
System Software
Your software gives
commands, the
system responds to
it
Suppose you have a
system that needs
to be controlled

5. OPPORTUNITIES THREATS
.
Increase the quantity until you get
to the setpoint
• Temperature
• Angle
• Speed
Increase Reduce
If too much, reduce the quantity,
until the setpoint

6. Controller
On/off
P
PI
PD
PID

7. On/Off controller is like operating switch.
Advantages/Disadvantages
• Inexpensive
• Simple
• Smallest response time
• Highest overshoot
• Large error

8. In the proportional control, the controller output is proportional
to the error signal , which is the difference between the setpoint
and the process variable.
Advantages/Disadvantages
• Simple and stable
• Easy to setup
• Offset occurs
• Small Response time
• Large overshoot
• Small error

9. PI controllers provide the low sensitivity necessary to produce
stable control.
Advantages/Disadvantages
• No sustained offset
• Possible increased overshoot on
start up

10. PD controllers make the system stable with rapid response.
Advantages/Disadvantages
• Stable
• Some offset
• Rapid response to changes

11. PID control provides a continuous variation of output within a
control loop feedback mechanism to accurately control the
process.
Advantages/Disadvantages
• Give best control
• No offset
• Minimum overshoot
• More expensive
• More complex to setup