LSIS XBE-DC08A, User Manual

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Chapter 6 Built-in PID Function
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6.7.3 Stand-alone Operation After PID Auto-tuning
Here, with example, it explains how to execute PID control followed by PID auto-tuning.
(1) PID auto-tuning parameter setting
▪ PID auto-tuning parameters are set as same as examples of 6.4.2 Example of PID Auto-tuning.
(2) Setting parameters of A/D input module and D/A output module
▪ Set the parameters of A/D input module and D/A output module as same as the example in 6.4.2 Example of PID
Auto-tuning.
(3) PID parameter setting
(a) If double-clicking Parameter – Built-in Parameter – PID – PID Parameter, it shows the built-in PID parameter setting
window as seen in Figure 6.26.
[ Figure 6.26 Auto-tuning parameter setting window ]
(b) Set each parameter and click OK.
In the example, Loop 0 is set as follows.
•
RUN mode: automatic
- Set as automatic in order that PID control is executed as the built-in PID operation outputs MV.
•
RUN direction: forward
- Since in the system, water level is going up as MV increases and pump’s rotation velocity increases, it should
be set as forward operation.
•
PWM Output: disabled
- In the example, auto-tuning using PWM is not executed. Therefore, PWM output is set as disabled.