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Derivative time (T
Setting range: 0 to 32767 [10ms]
PID control: derivative operation
PID control is used to sensitively react to changes caused in the process value (PV) by disturbance and minimize the
changes.
• Increasing the derivative time (T
disturbance.
Disturbance
MV
Ex.
PID operation in heating (reverse action)
MV
7 APPLICATION INSTRUCTIONS
740
7.18 PID Instruction
): (S3)+6
D
) enhances the movement to prevent the controlled system from varying greatly due to
D
T
(PID action)
D3
T
(PID action)
D1
T
(PID action)
D2
T
(PID action)
D3
T
D3
T
(PID action)
D2
T
(PID action)
D1
Change caused by disturbance
T
(PID action)
D3
PI action (D action not performed)
T
(PID action)
D2
T
(PID action)
D1
T
> T
> T
D3
D2
Response to the disturbance
T
(PID action)
D3
T
D3
T
(PID action)
D1
T
(PID action)
D2
PI action (D action not performed)
Error (EV)
> T
> T
D2
D1
SV
D1
Time
> T
> T
D2
D1
Time
Time
Time
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