40302010-10
4
2
6
10
12
8
14
Sp 1
Sp2
T out
T inlet
Fig. 15: Climate compensation, example 1
The settings in the drawing are:
Sp1 = 12°C at To = 0°C and
Sp2 = 4°C at To = 30°C.
Note that Sp1 belongs to the lowest and Sp2 to highest outside temperature.
The straight line in Fig. 15 indicates the inlet temperature variation under influence of the
outside temperature.
Select the menu Control values/Process temp./Process out temp./Control and go to Set point
1 and Set point 2 with .
Give Set point 1 the value Sp1 = 12°C from Fig. 15.
Give Set point 2 the value Sp2 = 4°C from Fig. 15.
At the same time, set Neutral zone = 3°C and Prop. band = 10°C as starting points. The sys-
tem is now adjusted to the desired function. The picture will now look like this:
The Actual Setpoint shows the regulating value of the inlet temperature at that particular mo-
ment. If the outside temperature is 30°C, this value must be 4°C. If the outside temperature
is 0°C, the value must be 12°C. The outside temperature can be seen in % of the measuring
range in the picture Control values/Capacity/Values.
Compressor control and surveillance
Engineering manual - Unisab III 1.10
001930 en 2014.09
81/319
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