Mitsubishi Electric FR-A800, Instruction Manual

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Parameters (A) Application parameters
FR-A800 5 - 527
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.
●
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.
Fig. 5-257:
Operation example for stepped changes of
measured value
I002689E
NOTE PI action is the result of P and I actions being added together.
Fig. 5-258:
Operation example for proportional changes of
measured value
I002687E
NOTE PD action is the result of P and D actions being added together.
Deviation Set point
P action
I action
PI action
Measured value
Time
Time
Time
Time
Time
Time
PD action
D action
P action
Set point
Measured value
Deviation