Section 4 Settings Required for Basic Control
4-20
Settings Required
for Basic Control
4.10
Determining the PID constants (AT, manual settings)
■ AT (Auto-tuning)
• When AT is run, the most suitable PID constants for the current SP
are automatically set. This is accomplished by varying the MV to
obtain the characteristics of the object of control (limit cycle
method).
• AT cannot be run during STOP or in manual mode.
• When running AT, select "0" to run AT for the PID set currently being
used for control, or select "1" to "8" as appropriate to run AT for a
specific PID set.
• The results of AT will be reflected in "PID setting level" in the
"Proportional band (P)", "Integral time (I)", and "Derivative time (D)"
of the PID Set No. specified at the time AT was run.
● Explanation of AT
operation
AT begins when "AT Execute/Cancel" is changed from "OFF" to "0".
While AT is running, AT Execute/Cancel" blinks in Display 1. Display 2
shows the PID Set No. currently being used for control. When AT ends,
"AT Execute/Cancel" goes off and the display stops blinking.
To stop AT, select "off: AT stop".
AT excute
at
off
l.adj
0
l.adj
at
1
l.adj
at
AT runs and the displays show
the following;
Display 1: Blinking display indi-
cating AT is running.
Display 2: Shows selected PID
Set No..
AT cancel
at
off
l.adj
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