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Direct electrical connection to the electric motor
If a star/delta switch is not used, the electric motor must be connected as shown below. See the
electric motor’s nameplate for more information.
Figure 4 Star or delta connection
Electrical connection of pressure switch on the discharge side (OPTIONAL)
The pressure switch is supplied with approximately one metre of 3-core cord. An example of a
pressure switch is illustrated in figure 6. When the measured pressure is below the desired pressure,
the red and brown cores make contact. Once the pressure exceeds the switching pressure of the
pressure switch, the brown and blue cores are connected by the pressure switch. Several different
pressure switches are available. Figure 7 shows an example of a pressure switch for the low-pressure
side.
Figure 5 Pressure switch circuit diagram,
no pressure situation
Figure 6 Pressure switch,
high pressure
Figure 7 Pressure switch, low
pressure
It is recommended installing this in a failsafe way so that there is a constant connection
when there are no problems. If a wire breaks, an alarm is given.
red
blue
brown
Star connection
Delta connection
