Engineering manual - UniSAB III 1.10.8
001930 en 2021.06
83/346
Compressor control and surveillance
3.1.11 Set point control with user input 1
The actual set points of Suction pressure, Process out (Brine) temperature, Discharge pressure, Proc-
ess out (Hot Water) and Capacity can all be changed through the 4-20 mA User input 1 signal. Connect
these to the terminals as shown in the wiring diagrams.
Suction pressure
In the picture Setup/Compr. Control the parameter Control on must be set to Suction Side. Select Setup/
Configuration/External input, and choose suction pressure set point control.
Ex.: The suction set point is to vary from -50 to -10°C/R corresponding to a change in the current signal
from 4-20 mA. Move the cursor to 4 mA, press and change the value to -50. Move the cursor to 20
mA, press and change the value -10. Move the cursor to the second line, press and select Suct.
Presure SP with or . Finish by pressing . The picture will now look like this:
The actual set point of the suction pressure regulator is to vary from -50 to -10°C/R corresponding to a
change in the current from 4-20 mA. It is possible to follow the set point value by selecting Control val-
ues/Suction/Pressure Deg./Control and pressing downwards to Actual set point with
Process out (Brine) temperature
In the picture Setup/Compr. Control the parameter Control on must be set to Process out temp (Brine).
Select Setup/Configuration/External input, and choose process out temperature set point control.
Ex.: The process out set point is to vary from -10 to +20°C corresponding to a change in the current sig-
nal from 4-20 mA. Move the cursor to 4 mA, press and change the value to -10. Move the cursor to
20 mA, press and change the value +20. Move the cursor to the second line, press and select
Proc. out SP with or . Finish by pressing . The picture will now look like this:
The actual set point of the brine regulator is now going to change from -10 to +20°C corresponding to a
change in the current from 4-20 mA. It is possible to follow the set point value by selecting Control val-
ues/Process temp/Process out temp./Control and pressing downwards to Actual set point with .
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