Engineering manual - SAB 193-233-283 S A-frame (including ATEX)
008831 en 2022.02
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Technical description
4.3 Description of main components and systems
The screw compressor unit is an integrated system consisting of the following major
subsystems:
• Control system
• Compressor
• Compressor lubrication system
• Compressor oil separation system
• Compressor hydraulic system
• Compressor oil cooling system
• Compressor easy-start system
For instructions to properly start up and operate the screw compressor unit, see the operating
manual.
4.4 Control system
UniSAB III reading, safety and capacity regulating system
UniSAB III is a control and monitoring system developed to fit all Johnson Controls Denmark's
Sabroe reciprocating and screw compressors, meaning the same UniSAB III unit is used for
both compressor types. Once compressor type, refrigerant and a few other functions have
been selected, UniSAB III is ready for operation. UniSAB III is based on Johnson Controls
Denmark's extensive experience with design and operation of compressor control systems.
Fig. 16: UniSAB III
UniSAB III is designed for safe control, monitoring and optimisation of compressor operation
and a minimum of unintended operation stops. In addition to efficient control and monitoring of
single compressors UniSAB III is also designed for advanced control and monitoring of any
combination of up to 14 compressors. It is thus possible to centrally control and monitor up to
14 compressors by using Profibus DP protocol, Modbus TCP protocol or a Comsab II module.
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