The auto-tuning function will automatically set the important constants, such as the proportional gain and the integral time, to ensure optimum PID control
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Limit Cycle Method:
For acquiring satisfactory control results in PID control, it is necessary to obtain the optimal value of each constant (parameter) suitable to the control target.
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.(If S3 = D10 ULV Parameters is D36)
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.(If S3 = D10 LLV Parameters is D37)
8.Set the threshold (hysteresis) (SHPV) Set the threshold (hysteresis) width (SHPV) in the operation setting parameter (ACT) (s3)+25.(If S3 = D10 SHPV Parameters is D35)
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.
Download Sample Below
Watch Tutorial at: https://youtu.be/k6zQuVMeJ_g
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| Mitsubishi PID Auto tuning Using Limit Cycle Method |