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