(1)
P Operation
In this operation, the control volume is proportional to the deviation (difference between the
target value and the current value).
(2)
I Operation
In this operation, the control volume is proportional to the time integral value of the deviation. The
P operation is less effective as the current value approaches the target value due to smaller devia-
tion, taking a long time to reach the target value. The I operation compensates this disadvantage.
(3)
D Operation
In this operation, the control volume is proportional to the percentage of change in the devi-
ation. Because using only the PI operation is time-consuming, the D operation is used to
effectively compensate for the disadvantage in responsiveness.
When the PID function is enabled, the setting unit for the following parameters is changed to percent-
age as 100% of the maximum frequency (d004 is always in units of %).
You can set the PID Scale (A075) to perform scale conversion of these parameters:
Value after conversion = Value before conversion PID Scale (A075)
Precautions for Correct Use
When the following parameters are read or written via Modbus communication, the data unit
differs between read and write operations. Set parameter values in units of 0.01 Hz for writing
and in units of the following percentages (as 100% of the maximum frequency) for reading.
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