Azbil SLPC1F, User Manual

Page: 61 / 86

5-15
Chapter 5. Adjusting PID Values
Model check graph
The PV and MV data loaded from the data file and the output of the mathematical
model when the MV is input are displayed.
The graph can be enlarged. The methods for enlarging/canceling are the same
as those for the simulation graph on the PID Simulator screen. Screen
explanations (p. 5-2)
(for details)
You can also cancel the zoom by clicking the [Unzoom] button.
Model error display area
This area displays a value that indicates the difference between the PV data and
the model output data. The smaller this value, the better the mathematical model
reproduces the device characteristics.
Based on this value, the mathematical model is classified into the following
categories:
0–25 An appropriate model
25–100 A somewhat faulty model
100+ A faulty model
In the case of a faulty model, the result of a PID control simulation and the control
result from the actual device may be very different.
Handling Precautions
•
This classification is a rough guideline, and does not guarantee the
accuracy of a mathematical model or a PID control simulation result.
Model parameter display grid
The parameters of the mathematical model are displayed. This mathematical model
is represented by the following transfer function:
: Gain
: 1st order lag
: 2nd order lag
: Dead time
Handling Precautions
•
The model parameter values may differ depending on the data, even for
the same device.