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Mitsubishi Electric FR-E520 Instruction Manual Page 159

Transistorized inverter.
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(2) PID action overview
1) PI action
A combination of proportional control action (P) and integral control action (I) for
providing a manipulated variable in response to deviation and changes with
time.
[Operation example for stepped changes of process value]
Note: PI action is the sum of P and I actions.
2) PD action
A combination of proportional control action
(P) and differential control action (D) for providing a manipulated variable in
response to deviation speed to improve the transient characteristic.
[Operation example for proportional changes of process value]
Note: PD action is the sum of P and D
actions.
3) PID action
The PI action and PD action are combined
to utilize the advantages of both actions for control.
Note: The PID action is the sum of the P,
I and D actions.
Deviation
P action
I action
PI action
Process
value
P action
D action
PD action
P action
I action
D action
PID action
149
PARAMETERS
Set point
Process value
Time
Time
Time
Set point
Deviation
Time
Time
Time
Set point
Deviation
Process
value
Time
Time
Time
y=at
2
+bt+c
Time
4

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