Mitsubishi Electric MELSEC-Q/L Programming Manual page 739

Proportional gain (K
Setting range: 1 to 32767[%]
PID control: proportional operation
The manipulated value (MV) increases in proportion to the error (difference between the set value (SV) and process value
(PV)) in the proportional operation. This proportion is called the proportional gain (K
relational expression.
Manipulated value (MV) = Proportional gain (K
The reciprocal of the proportional gain (K
As the proportional gain (K ) increases, the movement of getting the process value (PV) closer to the set value (SV) will be
P
stronger.
Ex.
Proportional operation (P operation) in heating (reverse action)
K
P3
K
P2
K
MV
K K
P3 P2
Ex.
Proportional operation (P operation) in cooling (direct action)
K K K
P3 P2 P1
MV
K K
P3 P2
): (S3)+3
P
)  error (EV)
P
) is called the proportional band.
P
Residual error
Proportional gain
K > K > K
P3 P2
P1
Proportional gain
K > K > K
P3 P2
K
P1
Proportional gain
K > K > K
P3 P2
Residual error
Proportional gain
K > K > K
P3 P2
K
P1
) and is expressed in the following
P
SV
PV
P1
Time
P1
Time
P1
PV
SV
Time
P1
Time
7 APPLICATION INSTRUCTIONS
7.18 PID Instruction
7
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