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9 PID CONTROL FUNCTION
9.7 Auto-Tuning
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9
■Operation characteristics (in an example of backward operation)
During the "W" period after the tuning cycle is finished, the output value is held at the output Lower Limit Value (LLV), and
then normal PID control is started. The value "W" can be obtained by the expression "W = (50 + KW)/100 ( - on)", and
the wait setting parameter "KW" can be set in the parameter (s3)+28. (Setting range: Kw = -50 to +32717 [%]) (When the
abnormal range is specified, "W" is handled as "0")
Input value
Time (s)
Output value (MV)
a
on
SV (target value)
SV+SHPV
SV-SHPV
0
1
2
W
Time
SHPV: PV Input threshold (hysteresis)
Output lower
limit value (LLV)
Output upper
limit value (ULV)