Mitsubishi Electric MELSEC-Q/L - Page 740

738
7 APPLICATION INSTRUCTIONS
7.18 PID Instruction
Integral time (T
I
): (S3)+4
Setting range: 0 to 32767 [100ms] (0 is treated as . (No integration))
PID control: integral operation
The time taken from when an error occurs in the integral operation to when the output of the integral operation becomes the
output of the proportional operation is called the integral time expressed in T
I
.
When T
I
is reduced, the integral operation becomes stronger.
Ex.
PI operation in heating (reverse action)
Ex.
PI operation in cooling (direct action)
0 < T
I3
< T
I2
< T
I1
0 < T
I3
< T
I2
< T
I1
T
I3
T
I1
T
I2
T
I3
T
I2
T
I1
PV by P action
Integral time
Integral time
Output by PI action
PV by PI action
Output by P action
SV
Time
Time
(T
I
)
(T
I
)
MV
Temperature
T
I2
T
I3
T
I1
T
I1
T
I2
T
I3
0 < T
I3
< T
I2
< T
I1
0 < T
I3
< T
I2
< T
I1
PV by P action
PV by PI action
Output by PI action
Output by P action
Integral time
Integral time (T
I
)
(T
I
)
Time
Time
MV
SV
Temperature