FR-A701 INSTRUCTION MANUAL (Applied) - Automation Systems ...

4PARAMETERSSpecial operation and frequency control(2) PID action overview1) PI actionA combination of P action (P) and I action (I) for providing amanipulated variable in response to deviation and changes with time.[Operation example for stepped changes of measured value](Note) PI action is the sum of P and I actions.P actionDeviationSet pointMeasured valueTimeI actionTimePI actionTime2) PD actionA combination of P action (P) and differential control action (D) forproviding a manipulated variable in response to deviation speed toimprove the transient characteristic.Set pointDeviation[Operation example for proportional changes of measured value]P actionMeasured valueTime(Note) PD action is the sum of P and D actions.D actionTimePDactionTime3) PID actionThe PI action and PD action are combined to utilize the advantages of bothactions for control.Set point(Note) PID action is the sum of P, I and D actions.P actionMeasured valueDeviationTimeI actionD actionTimeTimePID actionTime331