Johnson Controls SABROE Unisab III Control User 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
-40
-38
-33
1
-40
-38
1
-33
Normal
Cold store function
Suct.press (°C/R)
Pb = 5 K
Nz = 4 K
Pb = 5 K
Pb = 5 K
Nz = 4 K
Pb = 5 K
Suct.press (°C/R)
Compressor start
(Just outside Pb)
Compressor start
(Just outside Nz)
1
1
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 and with and choose between:
• Not defined
• Ready
• At min. cap.
• At max. cap.
• Running
Compressor control and surveillance
124/319
Engineering manual - Unisab III 1.10
001930 en 2014.09

Johnson Controls SABROE Unisab III Control Specifications

General

Brand	Johnson Controls
Model	SABROE Unisab III Control
Category	Control Systems
Language	English