User Manual_S7-1200 compressor controller
5
The control system monitors the status of the compressor parameters by using sensors,
transducers and protective devices that are listed in Table 2 and 3.The presence of the
sensors in the system depends on the particular compressor configuration and can't
exceeds the amount of three analogue sensors and eight digital sensors.
The control system is equipped with the 6 relay outputs monitored by the PLC controller.
Each of them can be set to one of several functions that are presented in Table 3. A part of
the outputs is closely related to the compressor configuration and its functions can not be
changed. The relay outputs are switched off when the PLC is without power or is in STOP
mode.
Table 2 List of analogue sensors of the control system.
Measured quantity
Sensor type
Input
signal to
PLC
Air pressure
0÷10V
obligatory
Oil temperature
PT100
Oil pressure
0÷10V
optional
Water pressure
Air temperature
Water temperature
Motor temperature
Motor current
Dew point temperature
Table 3 List of digital sensors the control system.
Measured quantity
Status while operating
Suction sensor NC
Closed
Suction sensor NO
Open
Air filter NC
Closed
Air filter NO
Open
Oil filter NC
Closed
Oil filter NIO
Open
Power control
Closed
Confirmation of the softstart start up Closed
Oil separator NC
Closed
Oil separator NO
Open
Remote control
Closed
Emergency STOP
Closed
Protection
Closed
Compressor motor protection
Closed
Fan motor protection
Closed
