Mitsubishi Electric 800 Series Instruction Manual page 418

NOTE
• Confirm that the measured values are stable when performing PID gain tuning with the step response method. When the
measured values are unstable, the tuning result may not be accurate.
• Accurate measurement of the maximum slope may not be achieved if the Pr.1213 setting is small in the step response
method.
 PID gain tuning operation setting (Pr.1218)
• Set the PID gain tuning operation in this parameter. The digit in the hundreds place represents the target PID loop. The
digit in the tens place represents the tuning method. The digit in the ones place represents the control adjustment method.
Pr.1218 setting
value
0 (initial value) PID gain tuning function disabled
100 First PID
101
102
111
112
121
122
200 Second PID
201
202
211
212
221
222
 Parameter setting for each PID gain tuning method
• Set the following parameters according to the selected tuning method (step response method / limit cycle method).
Pr. Tuning method
Step Limit cycle
response method
method
 
128
(753)
 
1218
1211  

1212 -

1213 -

1214 -

1215 -

1216 -

1217 -
: Parameter to set
Target PID
Step response method
Limit cycle method (set-point control)
Limit cycle method (follow-up control)
Step response method
Limit cycle method (set-point control)
Limit cycle method (follow-up control)
Item
PID action selection
PID gain tuning setting
PID gain tuning timeout time
Step manipulated amount
Step response sampling cycle
Timeout time after the maximum
slope
Limit cycle output upper limit
Limit cycle output lower limit
Limit cycle hysteresis
Tuning method
P control adjustment
PI control adjustment
PID control adjustment
PI control adjustment
PID control adjustment
PI control adjustment
PID control adjustment
P control adjustment
PI control adjustment
PID control adjustment
PI control adjustment
PID control adjustment
PI control adjustment
PID control adjustment
Description
Select the PID action.
Select the PID gain tuning operation.
Set the timeout time for PID gain tuning.
A timeout error occurs when the elapsed time exceeds the
setting.
Set the step manipulated amount for PID gain tuning.
Set the cycle for sampling of measurement values for PID gain
tuning.
Set the timeout time after the maximum slope measurement
for PID gain tuning.
The measurement for tuning is completed when the elapsed
time exceeds the setting.
Set the upper limit value of the two-position output for PID gain
tuning.
Set the lower limit value of the two-position output for PID gain
tuning. (When the setting exceeds the Pr.1215 setting, a
tuning error occurs.)
Set the hysteresis of the set point for PID gain tuning.
Control adjustment method
5. PARAMETERS
5.11 (A) Application parameters
3
4
5
5
5
6
7
8
9
10
417