MGI M4000E series, Instruction Manual

Page: 151 / 215

140
PARAMETERS
(5) Parameter setting
(6) Adjustment procedure
Parameter
Number
Setting Name Description
128
0
PID action
selection
No PID action
20 For heating, pressure control, etc. PID reverse action
21 For cooling, etc. PID forward action
50
Refer to the E5NL instruction manual for details.
51
60
61
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 process value. Hence, as the
proportional band narrows, the response sensitivity
(gain) improves but the stability deteriorates, e.g.
hunting occurs.
Gain K = 1/proportional band
9999 No proportional control
130
0.1 to
3600 s
PID integral
time
Time required for 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. If the feedback value exceeds the
setting, the FUP signal is output. (Process value of 4mA
is equivalent to 0% and 20mA to 100%.)
9999 No function
132
0 to
100%
Lower limit
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 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 operation mode.
For external operation, the voltage across 2-5 is the
set point.
(Pr. 902 value is equivalent to 0% and Pr. 903 value to
100%.)
134
0.01 to
10.00 s
PID
differential
time
Time required for the differential (D) action to provide the
same process value as that for the proportional (P)
action. As the differential time increases, greater
response is made to the deviation change.
9999 No differential control.
Adjust the PID control parameters, Pr. 128 to Pr. 134. Parameter setting
Set the output terminal functions. (Pr. 190 to Pr. 192) Terminal setting
Run
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