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PROCESS VALUE STABILIZATION
( 1, SCALE HIGH POINT)
Scale High Point :
Maximum process input value in Pt-100 and Tc
inputs
9999 for fixed dual point calibration used inputs,
Scale high point is the biggest one from
or
for selectable
dual point calibration used inputs
Scale high point is the biggest one from
or
for multi point
calibration used inputs
It is used for controlling if process value oscillates or not when
Parameter is
or
If;
condition is not
true and process value starts to oscillate (as shown in the diagram). If
parameter is
or
,then
parameter is selected
And then Limit Cycle Tune operation starts for determining new
PID parameters.
-
<= Process Value <=
+
Note:
Point position changes according to process input type and
scale, unit changes according to the selection in
parameter.
PROPORTIONAL BAND SHIFTING
((- SCALE HIGH POINT / 2 ) , ( SCALE LOW POINT / 2 ) )
If cooling function is performed ;
Cooling process set value is calculated by adding set value
with
parameter
Control form can be ON/OFF or PID.
If set value for heating =
+
;
Then set value for cooling =
+
+
Scale High Point :
Maximum process input value in Pt-100 and Tc
inputs
9999 for fixed dual point calibration used inputs,
Scale high point is the biggest one from
or
for selectable
dual point calibration used inputs
Scale high point is the biggest one from
or
for multi point
calibration used inputs
Note:
Point position changes according to process input type and
scale, unit changes according to the selection in
parameter.
Process
Value
Time
Auto Tune
Starting
Strn
Strn
Process Set
Value (
)
IS
SELECTED
IF