Engineering manual - UniSAB III 1.10.8
001930 en 2021.06
141/346
Compressor control and surveillance
3.5.7 User input
In the Configuration/External Input menu the following picture appears:
Place the cursor on Function. Press and with and choose between:
• Not used
• Suction pressure setpoint
• Process out setpoint
• Discharge pressure setpoint
• Hot water setpoint
• Capacity setpoint
• External input signal
This function is connected to an analogue input. See wiring diagrams.
Explanation
• Not used
The input signal is not used and alarm/shutdown supervision for this input is disabled.
• Suction pressure set point
The signal is used as a set point reference for the suction pressure regulator.
• Process out temp. (Brine) set point
The signal is used as a set point reference for the process out temperature regulator.
• Discharge pressure set point
The signal is used as a set point reference for the discharge pressure regulator.
• Hot water set point
The signal is used as a set point reference for the hot water temperature regulator.
• Capacity set point
The signal is used as a set point reference for the capacity regulator.
• User 1 (External) input signal
The signal is used as input signal for the User 1 (External) regulator.
See also subsection 3.1.10 User input regulator (Ext. input) for a more comprehensive explanation and
set up examples of User input 1.
3.5.8 Motor current measuring
UniSAB III can be supplied with a 0-1 Amp AC signal directly from a current transformer in the compres-
sor motor starter or supplied with a 4-20 mA signal from a current transmitter/VSD.
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