Liquiline CM442/CM444/CM448 Operation
Endress+Hauser 101
Source of data Options
•Sensors
• Current inputs
• Fieldbus signals
• Binary inputs
•Mathematical functions
Factory setting
None
Specify the input or output which should be the source of
data for the disturbance variable.
Measured value Options
•None
• Depends on theSource of
data
Factory setting
None
Specify the measured value that should be your
disturbance variable.
The measured value you can select depends on the
option selected under "Source of data".
Zp Range of adjustment
depending on the selection
of the measured value
Proportional band -->
Z0 Zero point
Parameters
The Liquiline PID controller has been implemented in the serial structural form, i.e. it has the following parameters:
• Integral action time T
n
• Derivative action time T
v
• Proportional band X
p
You can also configure the following for Setup Level="Advanced":
• Time constant T
wu
• Time constant Alpha
• Width of the neutral zone X
n
• Width of the hysteresis range of the neutral zone X
hyst
• Cycle time of the controller
Tn 0.0 to 9999.0 s
Factory setting
0.0 s
The integral action time specifies the effect of the
I-value
If Tn > 0, then the following holds true:
Clock < Twu < 0.5(Tn + Tv)
The integral action time is the time needed in a step-function response to achieve a change in the manipulated variable
- as a result of the I effect - which has the same magnitude as the P-value.
e = control deviation, e=w-x (setpoint controlled variable)
Path: Menu/Setup/Additional functions/Controller 1 or Controller 2
Function Options Info
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