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9 PID CONTROL FUNCTION
9.6 Details of Parameters
Proportional gain (s3)+3
During the proportional operation, the output (MV) increases in proportion to the deviation (difference between the target
value (SV) and the measured value (PV)). This deviation is called proportional gain (Kp), and expressed in the following
relational expression:
Output (MV) = Proportional gain (KP) Deviation (EV)
The reciprocal of the proportional gain (KP) is called proportional band. As the proportional gain (KP) is larger (as shown in
the example below), the motion to let the measured value (PV) be nearer to the target value (SV) becomes stronger.
Setting range: 1 to 32767 (%)
Ex.
Proportional operation (P operation) in backward operation (heating)
Ex.
Proportional operation (P operation) in forward operation (cooling)
Output value (MV)
Temperature
Remaining deviation
Proportional gain
KP3>KP2>KP1
Proportional gain
Time
Time
Target value (SV)
Measured value (PV)
KP3>KP2>KP1
KP3 KP2 KP1
KP3 KP2 KP1
Output value (MV)
Temperature
Remaining deviation
Proportional gain
KP3>KP2>KP1
Proportional gain
Time
Time
Target value (SV)
Measured value (PV)
KP3>KP2>KP1
KP3 KP2 KP1
KP3 KP2 KP1