Operation Liquiline CM44P
114 Endress+Hauser
Menu/Setup/Additional functions/Controller 1 ... 2
Function Options Info
XHyst 0.0 to 99.9 %
Factory setting
0.0 %
Width of the hysteresis range of the neutral
zone, relative component of x
n
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 clock time of the controller if
you know exactly what you are doing.
Clock < Twu < 0.5(Tn + Tv)
Max y change rate 0.00 to 1.00
Factory setting
0.40
Limits the change of the output variable
A value of 0.5 permits a maximum manipulated
variable change of 50 % within one second.
Exception behavior Hold=measured value is no longer reliable
Manipulated Variable Selection
• Freeze
• Fixed value
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
Fixed value
Manipulated variable is set to 0 (no dosing)
State Selection
• 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.
Hold as exception Selection
• All
• None
Factory setting
All
‣
Select: Should the hold trigger the previously
selected exception behaviour, or should it be
ignored?
Outputs Goes to the menu Outputs → 86
Controller assignment view Shows an overview of the inputs and outputs
used
10.6.4 Cleaning programs
L
CAUTION
Cleaning not switched off during calibration or maintenance activities
Risk of injury due to medium or cleaning agent!
‣
If a cleaning system is connected, switch it off before removing a sensor from the
medium.
‣
If you wish to check the cleaning function and have therefore not switched off the
cleaning system, wear protective clothing, goggles and gloves or take other appropriate
measures.
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