All regulators for capacity regulation (suction pressure, process temperature etc) can have
two set points which are selected by opening/closing a digital input named Regulator Sp1/Sp2
(see wiring diagrams). Note that also the Motor Current Limiter has two set points, which are
selected with another digital input named Motor Sp1/Sp2.
Control on = Suction pressure
The pressure is measured by the built-in pressure transducer on the compressor suction side.
The regulator is set by selecting Control values/Suction/Pressure Bar/Control or Control val-
ues/Suction/Pressure Deg./Control followed by repeated pressures on until reaching the
bottom of the picture. Note that the Neutral zone and the P band can only be selected when
the pressure is shown in °C/R (Deg.).
Control on = Process out (Brine)
The process out (brine) temperature is measured by a Pt 100 sensor connected to the process
out temperature input (see wiring diagrams). Position the sensor on the spot where the tem-
perature should be regulated. The sensor is not built into the compressor. The regulator is set
by selecting Control values/Process temp/Process out temp./Control followed by repeated
pressures on
until reaching the bottom of the picture.
Control on = discharge pressure
The pressure is measured by the built-in pressure transducer on the compressor discharge
side. The regulator is set by selecting Control values/Discharge/Pressure Bar/Control or Con-
trol values/Discharge/Pressure Deg./Control followed by repeated pressures on until reach-
ing the bottom of the picture. Note that the Neutral zone and the P band can only be selected
when the pressure is shown in °C/R (Deg.).
Control on = Process out (hot water)
The process out (hot water) temperature is measured by a Pt 100 sensor connected to the
process out temperature input (see wiring diagrams). Position the sensor on the spot where
the temperature should be regulated. The sensor is not built into the compressor.
The regulator is set by selecting Control values/Process temp/Process out temp./Control fol-
lowed by repeated pressures on until reaching the bottom of the picture. Note that the
Process out temperature regulator at this stage functions as a hot water regulator. The differ-
ence is that the compressor will load capacity at decreasing temperature.
3.1.10 User input regulator (Ext. input)
In addition to the above mentioned regulators the User input regulator can also be used. To
do so, connect a 4-20 mA sensor (pressure, temperature or other) to the Unisab III input
named User input 1 (External set point). When selecting 4-20 mA input in the menu Setup/
Configuration/External input, the following picture will appear:
Compressor control and surveillance
Engineering manual - Unisab III 1.10
001930 en 2014.09
75/319
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