Mitsubishi Electronics FX5 User Manual
9 PID CONTROL FUNCTION
9.7 Auto-Tuning
69
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, "
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)