The operating characteristics of the vacuum pumping system are analysed,and according to the relationship between the inlet pressure of the Roots pump pumping system and the speed of the motor,a project is designed for the application of PLC and frequency converter in the vacuum pumping system.The project adopts the analogue input of PLC to collect the signal from the pressure sensor,and the analogue output to control the input current of the frequency converter,so as to regulate the rotational speed of the motor,and the control function of the project is achieved through the project's hardware configuration,parameter setting,PLC program design and debugging.
NETL
NSTL
万方数据
