Omron SYSDRIVE MX2 SERIES, User Manual

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7 Other Functions
7 - 46 Multi-function Compact Inverter 3G3MX2-V1 User’s Manual (I585-E1)
(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:
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.
F001: 0.01%
A011, A012, A020/A220, A021 to A035, A101, A102, A145: 0.1%
PID Operation
PID Target Value Setting Unit and PID Scale
Value after conversion = Value before conversion × PID Scale (A075)
d004 F001 A011 A012 A020 A220 A021 A022
A023 A024 A025 A026 A027 A028 A029 A030
A031 A032 A033 A034 A035 A101 A102 A145
A072
A072
Large
Step transition
Target value
Ramp transition
Small
Large
Small
Control volume
A073 A073
Small
Step transition
Target value
Ramp transition
Large
Small
Large
Control volume
A074
A074
Step transition
Target value
Ramp transition
Control volume
Large
Small
Large
Small