Aux. Output - Johnson Controls SABROE Unisab III Control Engineering Manual

If the Cold store function has been selected in the menu Compr. Control, the compressor will
not start until the measured value is outside the P Band. After this it will regulate normally in
accordance with the set point.
Example of cold store function: Unisab III is set for suction pressure regulation with
Set point (Sp) = -40°C
Neutral zone (Nz) = 4 K
Proportional band (Pb) = 5 K
Normal
Suct.press (°C/R)
-33
1
-38
-40
Compressor start
1
(Just outside Nz)
Cold store function
Suct.press (°C/R)
1
-33
-38
-40
Compressor start
1
(Just outside Pb)
Note: It is not recommended to use the cold store function on screw compressors.

3.5.6 Aux. output

In the menu Configuration/Aux Output the following picture appears:
Place the cursor on Activate when. Press
• Not defined
• Ready
• At min. cap.
• At max. cap.
• Running
Pb = 5 K
Nz = 4 K
Pb = 5 K
Pb = 5 K
Nz = 4 K
Pb = 5 K
and with
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Compressor control and surveillance
and choose between:
Engineering manual - Unisab III 1.10
001930 en 2014.09