# Mitsubishi Electric FR-F820-00046 Instruction Manual Page 419

Fr-f800 series.

For tuning, use the step response method or the limit cycle method.
Pr.
1211
PID gain tuning timeout time
A690
1212
Step manipulated amount
A691
1213
Step responding sampling cycle
A692
1214
Timeout time after the maximum
A693
slope
1215
Limit cycle output upper limit
A694
1216
Limit cycle output lower limit
A695
1217
Limit cycle hysteresis
A696
1218
PID gain tuning setting
A697
1219
PID gain tuning start/status
A698
 Step response method
• In the step response method, the manipulated amount is changed step by step for the real system. From the change in the
measured values, the maximum slope (R) and the equivalent waste time (L) are calculated to determine each constant.
Manipulated
Measured value[%]
waste time L (s)
PID gain tuning start
• The step manipulated amount (Pr.1212 - 1000) is added to the present manipulated amount.
• The measured value is taken for every sampling cycle (Pr.1213). From the variation between the measured values (Y) and
the time (t), the maximum slope (R) is calculated.
• The measurement ends when the timeout time (Pr.1214) elapsed after the maximum slope is obtained.
• After the integral term is cleared, PID control is performed with the constant to which the change has been applied (the
constant used before PID gain tuning when a fault occurs).
418
5. PARAMETERS
5.11 (A) Application parameters
Initial
Name
value
100 s
1000%
1 s
10 s
1100%
1000%
1%
0
0
amount[%]
Maximum
Maximum
Maximum
slope R
slope R
slope R
(R=Y/T)
(R=Y/T)
(R=Y/T)
Equivalent
STF
PID
PGT
Setting range
Set the time after the PID gain tuning starts until a
1 to 9999 s
timeout error occurs.
Set the step manipulated amount when using the
900 to 1100%
step response method to perform the PID gain
tuning.
Set the cycle for sampling of measurement values
0.01 to 600 s
when using the step response method to perform
the PID gain tuning.
Set the time after the measurement of the
maximum slope until the completion of the tuning
1 to 9999 s
when using the step response method to perform
the PID gain tuning.
Set the upper limit value of the two-position output
900 to 1100%
when using the limit cycle method to perform the
PID gain tuning.
Set the lower limit value of the two-position output
900 to 1100%
when using the limit cycle method to perform the
PID gain tuning.
Set the hysteresis of the set point when using the
0.1 to 10%
limit cycle method to perform the PID gain tuning.
0, 100 to 102, 111, 112,
Select the target loop, method, and control
121, 122, 200 to 202,
adjustment method for the PID gain tuning.
211, 212, 221, 222
0
PID gain tuning function disabled
1
PID gain tuning start
2
During PID gain tuning (read only)
8
PID gain tuning forced end
9, 90 to 96
PID gain tuning end
Equivalent time constant T (s)
Timeout time after the maximum slope (s)
(Pr.1214)
Description
Step manipulated amount
(Pr.1212-1000)
Time
Measured value
variation range Y
Time  