Engineering manual - UniSAB III 1.10.8
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001930 en 2021.06
UniSAB III control
1. UniSAB III control
1.1 Introduction
The purpose of the UniSAB III control system is to monitor, protect, control and regulate reciprocating
and screw compressors. The control cabinet as well as the electrical components have been connected
from factory. Thus, only a few connections are needed to link to the electrical installations on site.
UniSAB III is programmed according to the type of compressor it is going to control. See chapter 6. Set-
up in the Engineering manual.
UniSAB III offers different ways of controlling/regulating compressor capacity according to pressure lev-
els or temperatures. Compressor capacity can be regulated both manually and automatically.
Furthermore, a number of limiting functions have been incorporated. In periods of overloading, these
limiting functions will intervene and limit compressor capacity until the situation has returned to normal.
Consequently, the number of undesirable operational stops will be reduced as well as the need for
supervision.
Compressors fitted with UniSAB III Control can be linked via the built-in communication system, Multi-
sab. In this way, compressors can work in a common refrigerating system, thus optimising the operation
of the entire compressor plant.
The communication system further allows UniSAB III to be connected to a PLC or PC central monitoring,
control and data logging system. UniSAB III can be linked to and communicate with former Sabroe con-
trol units such as UniSAB II.
UniSAB III is operated by means of a front panel as shown in Fig. 3. The front panel is well-arranged with
only a few keys and a distinct display.
UniSAB III does not lose its preset or changed values in the event of a temporary power failure. It con-
tains a battery, which is used by the built-in timer to ensure that time and date are always correct even if
power has been disconnected. The hour counter and any stored alarm values will maintain the correct
time.
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