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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