Liquiline CM44P Operation
Endress+Hauser 113
Menu/Setup/Additional functions/Controller 1 ... 2
Function Options Info
Twu 0.1 to 999.9 s
Factory setting
20.0 s
Time constant for anti‐windup feedback
The lower the value the greater the integrator
inhibition. Exercise extreme caution when
making changes.
Clock < Twu < 0.5(Tn + Tv)
Tv 0.1 to 999.9 s
Factory setting
0.0 s
The derivative action time specifies the effect of
the D-value
The derivative action time is the time by which the ramp response of a PD controller reaches a specific value of
the manipulated variable at an earlier stage than it would solely as a result of its P-value.
alpha 0.0 to 1.0
Factory setting
0.3
Affects the additional damping filter of the D‐
controller. The time constant is calculated from
α
.
T
v
.
Process balance
Controller type = PID 2-
sided
Selection
• Symmetric
• Asymmetric
Factory setting
Symmetric
Symmetric
There is only one control gain and this applies
for both sides of the process.
Asymmetric
You can set the control gain individually for both
sides of the process.
Xp
Process balance =
Symmetric
Range of adjustment and
factory setting depending
on the Source of data
Proportional band, reciprocal value of the
proportional gain K
p
As soon as controlled variable x deviates more
than x
p
from the set point w, manipulated
variable y reaches 100%.
Xp Low
Process balance =
Asymmetric
Range of adjustment and
factory setting depending
on the Source of data
x
p
for y < 0 (manipulated variable < 0)
Xp High
Process balance =
Asymmetric
x
p
for y > 0 (manipulated variable > 0)
Xn Range of adjustment and
factory setting depending
on the Source of data
Tolerance range about the set point that
prevents minor oscillations about the set point if
using two-sided control loops.
XN Low
Process balance =
Asymmetric
Range of adjustment and
factory setting depending
on the Source of data
x
n
for x < w (controlled variable < set point)
XN High
Process balance =
Asymmetric
x
n
for x > w (controlled variable > set point)
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