Mitsubishi Electric FR-E540 Instruction Manual download pdf (Page 134)

PARAMETERS

121

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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.

Time

Process value

P action

I action

PI action

Deviation Set point

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.

Time

Deviation

P action

D action

PD action

Set point

Process

value

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.

Time

Deviation

P action

D action

PID action

Set point

Process

value

Time

I action

y=at +bt+c

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Mitsubishi Electric FR-E540 Instruction Manual Page 134

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