Mitsubishi Electric FR-A820-00046 Instruction Manual page 748

(A) Application parameters
PID action outline
● PI action
PI action is a combination of proportional action (P) and integral action (I), and applies a manipulated
amount according to the size of the deviation and transition or changes over time.
NOTE PI action is the result of P and I actions being added together.
● PD action
PD action is a combination of proportional action (P) and differential action (D), and applies a manip-
ulated amount according to the speed of the deviation to improve excessive characteristics.
NOTE PD action is the result of P and D actions being added together.
5 - 546
Deviation Set point
Measured value
P action
I action
PI action
Set point
Deviation
Measured value
P action
Time
D action
Time
PD action
Time
Fig. 5-262:
Operation example for stepped changes of
measured value
Time
Time
Time
Fig. 5-263:
Operation example for proportional changes of
measured value
Parameters
I002689E
I002687E