Mitsubishi Electric FR-F500 Series Instruction Manual page 139

(5) Parameter setting
Parameter
Setting
Number
10
11
128 20
21
30
31
0.1 to 1000%
129
9999
0.1 to 3600 s
130
9999
0 to 100%
131
9999
0 to 100%
132
9999
133 0 to 100%
0.01 to 10.00 s
134
9999
( 6 ) Adjustment procedure
Parameter setting
Terminal setting
Switch X14 signal on.
Name
For heating, pressure control,
etc.
For cooling, etc.
PID action
selection
For heating, pressure control,
etc.
For cooling, etc.
Valid only under advanced PID control (NA, EC versions only) Refer to page 151.
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)
PID proportional
improves but the stability deteriorates, e.g. hunting occurs.
band
Gain K = 1/proportional band.
Time only required for the integral (I) action to provide the same manipulated
variable as that for the proportional (P) action. As the integral time
PID integral time
decreases, the set point is reached earlier but hunting occurs more easily.
Set the upper limit. If the feedback value exceeds the setting, the FUP signal
Upper limit is output. (Process value of 4mA is equivalent to 0% and 20mA to 100%.)
Set the lower limit. If the feedback value falls below the setting, the FDN
signal is output. (Process value of 4mA is equivalent to 0% and 20mA to
Lower limit
100%.)
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 2-5 is the set point.
operation
(Pr. 902 value is equivalent to 0% and Pr. 903 value to 100%.)
Time only required for the differential (D) action to provide the same process
value as that for the proportional (P) action. As the differential time
PID differential
increases, greater response is made to the deviation change.
time
Adjust the PID control parameters, Pr. 128 to Pr. 134
Set the I/O terminals for PID control. (Pr. 180 to Pr. 186, Pr. 190 to Pr.195)
Pr. 128 = 10, 11, 20, 21
Run
Description
Deviation value
signal input
(terminal 1)
Set point (terminal 2
or Pr. 133), Process
value input, (terminal
4)
No proportional control
No integral control.
No function
No function
No differential control.
126
PARAMETERS
PID reverse
action
PID forward
action
PID reverse
action
PID forward
action