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When does Proportional (P) Integral (I) Derivative (D) Controllers are Used
Proportional (P) Controller is used during the following condition?
Load Changes are small
Offset (error exist due to difference between steady state value and desired value) can be tolerated
The process reaction rate is such as to permit a narrow proportional band. Since this reduces the amount of the offset
When Integral (I) Controller is Use?
Integral (I) controller is used durin?
When the offset must be eliminated
Integral saturation due to sustained deviation is not objectionable
When Derivative (D) Controller is use?
Large transfer or distance velocity lags are present
It is necessary to minimize the amount of deviation caused by the system changes
When Proportional plus Integral (PI) Controller is use?
Proportional and Integral action is employed when
System changes is small
Offset must be eliminated
No objection on the recovery duration
When Proportional and Derivative (PD) controller is use?
PD action is employed whe?
When the system changes are small
Improve the recovery time
When system lags are high
When Proportional, Integral and Derivative (PID) Controller is use?
PID controller is used when system require?
System changes are small
Offset must be eliminated
Fast recovery time
Load Changes are small
Offset (error exist due to difference between steady state value and desired value) can be tolerated
The process reaction rate is such as to permit a narrow proportional band. Since this reduces the amount of the offset
When Integral (I) Controller is Use?
Integral (I) controller is used durin?
When the offset must be eliminated
Integral saturation due to sustained deviation is not objectionable
When Derivative (D) Controller is use?
Large transfer or distance velocity lags are present
It is necessary to minimize the amount of deviation caused by the system changes
When Proportional plus Integral (PI) Controller is use?
Proportional and Integral action is employed when
System changes is small
Offset must be eliminated
No objection on the recovery duration
When Proportional and Derivative (PD) controller is use?
PD action is employed whe?
When the system changes are small
Improve the recovery time
When system lags are high
When Proportional, Integral and Derivative (PID) Controller is use?
PID controller is used when system require?
System changes are small
Offset must be eliminated
Fast recovery time