Siemens Sinamics G120P Operating Instructions Manual page 300

Operation
6.10 Operation with the IOP
Open-loop controlled compressor
The inverter regulates the output pressure of a compressor in accordance with the varying
gas volumes to be compressed.
To compress the gas, the volume is reduced and the pressure in the container is increased.
The setpoint is specified using the analog inputs.
The system consists of the following components:
● Control Unit
● Power Module
● Motor
● Compressor
● Motor temperature sensor (optional)
Closed-loop controlled compressor
A constant pressure must be maintained in a system with minimum energy consumption.
The system pressure is monitored by the PID closed-loop controller. When the pressure
remains constant, the inverter operates the system with minimum frequency.
The setpoints are specified using analog input 0.
The actual value of the system is received using analog input 1 of the pressure sensor. The
inverter uses this actual value in order to respond to changes of the system pressure.
The ON/OFF and reset commands are controlled using digital input 0 or 1.
The general monitoring of the inverter state is performed using digital output 0 (inverter
fault), 1 (inverter ready) and 2 (inverter running).
The system consists of the following components:
● Control Unit
● Power Module
● Motor
● Compressor
● Pressure sensor
● Motor temperature sensor (optional)
300
Inverter cabinet units
Operating Instructions, 12/2014, A5E32923362A