Endress+Hauser Liquiline CM44P - Page 108

Operation Liquiline CM44P
108 Endress+Hauser
The graphic does not illustrate a downstream filter for limiting the rate of change of the
manipulated variable (can be configured in the menu in Max y change rate).
In the menu do not configure the gain K
p
. Instead configure the reciprocal value, the
proportional band X
p
(K
p
=1/X
p
).
Configuration
Make the following decisions to configure a controller:
• (1) What type of process can your process be assigned to? → Process type
• (2) Should it be possible to influence the measured variable (controlled variable) in one
direction or in both directions? One-sided or two-sided controller, → Controller type
• (3) What should be the controlled variable (sensor, measured value)? → Controlled
variable
• (4) Do you have a disturbance variable that should be active at the controller output? →
Disturbance variable
• (5) Specify the parameters for the controller:
• Set point, → Setpoint
• Neutral zone, → Xn
• Proportional band, → Xp
• Integral action time (I-value), → Tn
• Derivative action time (D-value), → Tv
• (6) What should the controller do in the event of a hold (measured error, sensor
replacement, cleaning etc.)?
• Pause or continue with dosing? →Hold behavior/Manipulated Variable
• At the end of a hold, continue or restart the control loop (affects I‐value)? →Hold
behavior/State
• (7) How should the actuator be triggered?
• Unipolar+: assign this setting to the output for an actuator which can increase the
measured value.
• Unipolar-: assign this setting to the output for an actuator which can decrease the
measured value.
• Bipolar: select this setting if you want to output the manipulated variable via one
current output only (split range).
• (8) Configure the outputs and switch on the controller.
Menu/Setup/Additional functions/Controller 1 ... 2
Function Options Info
Control Selection
• Off
• Automatic
• Manual mode
Factory setting
Off
‣
First configure the controller and leave the
switch at the factory setting (Off).
Once you have made all the settings, you can
assign the controller to an output and switch it
on.
Manual mode
y -100 to 100 %
Factory setting
0 %
‣
Specify the manipulated variable that should
be output in manual mode.
y Actual output Read only Manipulated variable actually output.
Setpoint Current set point
x Current measured value
Disturbance variable Current measured value of disturbance variable
Norm. disturb. value
Name Free text
‣
Give the controller a name so you can
identify it later on.