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Mitsubishi Electric FX5 User Manual page 86

Melsec iq-f series
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Parameters set in limit cycle method
The parameters specified in the limit cycle method are shown below.
Parameter
Proportional gain (KP)
Integral time (TI)
Differential time (TD)
Auto-tuning procedure
1.
Set forward or backward operation
Set the operation direction flag (b0) in the operation setting parameter (ACT) (s3)+1.
2.
Select the auto-tuning method (limit cycle method)
Set the auto-tuning method to ON (b6) in the operation setting parameter (ACT) (s3)+1. (When bit 6 is set to OFF, the step
response method is selected.)
3.
Set the auto-tuning execution flag to ON
Set the auto-tuning execution flag to ON (b4) in the operation setting parameter (ACT) (s3)+1.
4.
Set the input filter
Set the input filter in the operation setting parameter (ACT) (s3)+2.
5.
Set the sampling time
Set the sampling time (s3).
6.
Set the Upper Limit Value (ULV)
Set the Upper Limit Value (ULV) of the output value (MV) in the operation setting parameter (ACT) (s3)+26.
7.
Set the Lower Limit Value (LLV)
Set the Lower Limit Value (LLV) of the output value (MV) in the operation setting parameter (ACT) (s3)+27.
8.
Set the threshold (hysteresis) (SHPV)
Set the threshold (hysteresis) width (SHPV) in the operation setting parameter (ACT) (s3)+25.
9.
Set the target value (SV)
Set the target value (SV) in PID instruction.
10.
Set the PID instruction command input ON to start auto-tuning
Auto-tuning is executed according to the measured value (PV).
When auto-tuning is completed, the auto-tuning flag (b4 and b6) turns OFF in the operation setting parameter (ACT) (s3)+1.
10 PID CONTROL FUNCTION
84
10.7 Auto-Tuning
Setting position
(s3)+3
(s3)+4
(s3)+6

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