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143
PID control (Pr. 128 to Pr. 134)
PARAMETERS
3
(5) Parameter setting
*: The value changes by calibration
(6) Adjustment procedure
Parameter
Number
Setting Name Description
128
10
PID action
selection
For heating, pressure control,
etc.
Deviation value
signal input
(terminal 1)
PID reverse action
11
For cooling, etc. PID forward action
30
For heating, pressure control,
etc.
measured value input
(terminal 1)
PID reverse action
31
For cooling, etc. PID forward action
129
0.1 to
1000%
PID proportional
band
If the proportional band is narrow (parameter setting is small), the manipulated
variable varies greatly with a slight change of the measured value. Hence, as
the proportional band narrows, the response sensitivity (gain) improves but the
stability deteriorates, e.g. hunting occurs.
Gain Kp = 1/proportional band
9999
No proportional control
130
0.1 to 3600s
PID integral
time
Time required for only the integral (I) action to provide the same manipulated
variable as that for the proportional (P) action. As the integral time decreases,
the set point is reached earlier but hunting occurs more easily.
9999
No integral control.
131
0 to 100%
Upper limit
Set the upper limit value. If the feedback value exceeds the setting, the FUP
signal is output. (measured value of 0V is equivalent to 0% and 10V to 100%.)*
9999
No function
132
0 to 100%
Lower limit
Set the lower limit value. (If the measured value goes out of the setting range,
an alarm can be output. In this case, the measured value of 0V is equivalent to
0% and 10V to 100%.)*
9999
No function
133 0 to 100%
PID action set
point for PU
operation
Only valid for the PU command in the PU operation or PU/external combined
mode.
For external operation, the voltage across terminals 2-5 is the set point.
(Pr. 902 value is equivalent to 0% and Pr. 903 value to 100%.)
134
0.01 to
10.00s
PID differential
time
Time required for only the differential (D) action to provide the same
manipulated variable as that for the proportional (P) action. As the differential
time increases, greater response is made to a deviation change.
9999
No differential control.
Parameter setting Adjust the PID control parameters, Pr. 128 to Pr. 134.
Terminal setting
Set the I/O terminals for PID control
(Pr. 180 to Pr. 183, Pr. 187, Pr. 190 to Pr. 192, Pr. 195).
Pr.128 = 10, 11, 30, 31
Turn on X14 signal.
Run