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The integral operation is an operation to change the output to remove the error generated in succession. This
can eliminate the residual error occurring in the proportional operation.
MV
Derivative gain (K
): (S3)+5
D
Setting range: 0 to 100[%]
PID control: derivative operation
A filter is applied to the output by the derivative operation. The derivative gain (K
• When the derivative gain (K
value by disturbance.
• When the derivative gain (K
disturbance.
Set the derivative gain (K
responds too sensitive to disturbance, increase the value.
Error (EV)
Integral time (T
)
I
) is small, output responds instantaneously, specifically to a change caused in the process
D
) is large, output takes time to respond to a change caused in the process value by
D
) to 0, and make adjustment with the input filter (). If the change in output
D
Time
Output by P action + I action
Output by I action
Output by P action
Proportional gain (K
) × Error (EV)
P
Time
) affects only the derivative operation.
D
7 APPLICATION INSTRUCTIONS
739
7.18 PID Instruction
7
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