Proportional (P), Integral (I), Derivative (D) Controllers Usage Conditions

1. When does the Proportional (P) Controller is used?

Answer. Proportional (P) Controller is used during the following conditions:

1. Load Changes are small
2. Offset (error exist due to difference between steady state value and desired value) can be tolerated.
3. The process reaction rate is such as to permit a narrow proportional band. Since this reduces the amount of the offset.

2. When does the Integral (I) Controller is used?

Answer. Integral (I) controller is used during the following conditions:

1. When the offset must be eliminated
2. Integral saturation due to sustained deviation is not objectionable

3. When does the Derivative (D) Controller is used?

Answer. Derivative (D) controller is used during the following conditions:

1. Large transfer or distance velocity lags are present
2. It is necessary to minimize the amount of deviation caused by the system changes

4. When does the Proportional and Integral (PI) Controller is used?

Answer. Proportional and Integral action is used when

1. System changes is small
2. Offset must be eliminated
3. No objection on the recovery duration

5. When does the Proportional and Derivative (PD) controller is used?

Answer. PD action is employed when

1. When the system changes are small
2. Improve the recovery time
3. When system lags are high

6. When does the Proportional, Integral and Derivative (PID) Controller is used?

Answer. PID controller is used when

1. System changes are small
2. Offset must be eliminated
3. Fast recovery time

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