Endress+Hauser Liquiline CA80SI - Page 95

Liquiline System CA80SI Operation
Endress+Hauser 95
Menu/Setup/Additional functions/Controller 1 ... 2
Function Options Info
Controller type Selection
• PID 1-sided
• PID 2-sided
Factory setting
PID 2-sided
Depending on which actuator you have
connected, you influence the process in only one
direction (e.g. heating) or in both directions (e.g.
heating and cooling).
A 2‐sided controller can output a manipulated variable in the range from -100 % to +100 %, i.e. the
manipulated variable is bipolar. The manipulated variable is positive if the controller should increase the
process value. In the case of a pure P-controller, this means that the value of the controlled variable x is smaller
than the set point w. On the other hand, the manipulated variable is negative if the process value should be
decreased. The value for x is greater than the set point w.
y
+100 %
0 %
-100 %
x < w
w
x > w
x
X
p
X
p
 72 Relationship y = (w-x)/X
p