Integral Operation (I Operation) - Mitsubishi Electric MELSEC-Q series Programming Manual

Integral operation (I operation)

The control method for integral operation is described below.
• In the integral operation, the MV (manipulated value) changes continuously to zero deviation when it occurs. This operation
can eliminate the offset that is unavoidable in proportional operation.
• The time required for the MV in integral operation to reach the MV for proportional operation after the generation of
deviation is called the integral time. Integral time is expressed as T
Condition
When integral time T is shorter
I
When integral time T is longer
I
• The integral operation in step response with a constant E (deviation) is illustrated below.
• Integral operation is always used in combination with proportional operation (PI operation) or with proportional and
derivative operations (PID operation). Integral operation cannot be used independently.
4 FUNCTIONS OF PID CONTROL
28
4.2 Functions of PID Control
.
I
Integral Operation
Integrating effect increases and the time to eliminate the offset becomes
shorter. However, hunting is more likely to occur.
Integrating effect decreases and the time to eliminate the offset becomes
longer.