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 corre-
sponding to a change in the current from 4-20 mA. It is possible to follow the set point value
by selecting Control values/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 signal 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 corre-
sponding to a change in the current from 4-20 mA. It is possible to follow the set point value
by selecting Control values/Process temp/Process out temp./Control and pressing downwards
to Actual set point with
.
Compressor control and surveillance
Engineering manual - Unisab III 1.10
001930 en 2014.09
77/319
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