Liquiline CM442/CM444/CM448 Operation
Endress+Hauser 103
Xn
Process
balance="Symmetric"
Range of adjustment and
factory setting
Depends on the "Source of
data"
Tolerance range about the setpoint that prevents minor
oscillations about the setpoint if using two-sided control
loops.
XN Low Range of adjustment and
factory setting
Depends on the "Source of
data"
Process balance="Asymmetric"
XN High
XHyst 0.0 to 99.9 %
Factory setting
0.0 %
Width of the hysteresis range of the neutral zone,
relative component of Xn
The graphic illustrates the manipulated variable (with a pure P-controller ) over the control deviation e (set point minus
controlled variable). Very low control deviations are set to zero. Control deviations > X
n
are processed "in the normal
way". Via X
hyst
it is possible to configure a hysteresis to suppress oscillations at the edges.
Clock 0.333 to 100.000 s
Factory setting
1.000 s
Expert setting!
Only change the cycle time of the controller if you know
exactly what you are doing!
Clock < Twu < 0.5(Tn + Tv)
Max Y change rate /s 0.00 to 1.00
Factory setting
0.40
Limits the change of the output variable
Hold behavior Hold=measured value is no longer reliable
Manipulated Variable Options
•Freeze
•Set to zero
Factory setting
Freeze
How should the controller react to a measured value that
is no longer reliable?
Freeze
The manipulated variable is frozen at the current value
Set to zero
Manipulated variable is set to 0 (no dosing)
State Options
•Freeze
• Reset
Factory setting
Freeze
Internal controller status
Freeze
No change
Reset
After a hold, the control system starts from scratch, and
settling time takes place again.
Path: Menu/Setup/Additional functions/Controller 1 or Controller 2
Function Options Info
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