Mitsubishi Electric FR-V560 Instruction Manual page 165

PID control (Pr. 128 to Pr. 134)
(5) Parameter setting
Parameter
Setting
Number
10
11
128
30
31
0.1 to
1000%
129
9999
0.1 to 3600s
130
9999
0 to 100%
131
9999
0 to 100%
132
9999
133 0 to 100%
0.01 to
10.00s
134
9999
*: The value changes by calibration
(6) Adjustment procedure
Parameter setting
Terminal setting
Turn on X14 signal.
Run
Name
For heating, pressure control,
etc.
For cooling, etc.
PID action
selection
For heating, pressure control,
etc.
For cooling, etc.
If the proportional band is narrow (parameter setting is small), the manipulated
variable varies greatly with a slight change of the process value. Hence, as the
proportional band narrows, the response sensitivity (gain) improves but the
PID proportional
stability deteriorates, e.g. hunting occurs.
band
Gain Kp= 1/proportional band
No proportional control
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,
PID integral
the set point is reached earlier but hunting occurs more easily.
time
No integral control.
Set the upper limit value. If the feedback value exceeds the setting, the FUP
signal is output. (Process value of 0V is equivalent to 0% and 10V to 100%.)*
Upper limit
No function
Set the lower limit value. (If the process value goes out of the setting range, an
alarm can be output. In this case, the process value of 0V is equivalent to 0%
Lower limit
and 10V to 100%.)*
No function
Only valid for the PU command in the PU operation or PU/external combined
PID action set
mode.
point for PU
For external operation, the voltage across terminals 2-5 is the set point.
operation
(Pr. 902 value is equivalent to 0% and Pr. 903 value to 100%.)
Time required for only the differential (D) action to provide the same
manipulated variable as that for the proportional (P) action. As the differential
PID differential
time increases, greater response is made to a deviation change.
time
No differential control.
Adjust the PID control parameters, Pr. 128 to Pr. 134.
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
Description
Deviation value
signal input
(terminal 1)
Process value input
(terminal 1)
156
PID reverse action
PID forward action
PID reverse action
PID forward action