Abstract:
Mixing System is the core motor, Motor modern microelectronic devices are as a controller to power electronic power conversion systems for the implementation, In theory controlled under the guidance of electric drive and control the speed of motors, electrical energy into mechanical energy. achieving mechanical rotary movements or repeated movements.
VVVF with high efficiency, wide range and high precision characteristics is the most widely used and most promising approach speed. VVVF many different types of systems, from the 1950s, the voltage source inverter, have developed a current source, pulse width modulation, and other inverter. Currently VVVF major programs : AC-AC Frequency Control, AC-DC-AC Frequency Control, Synchronous Motor VVVF-controlled system, sinusoidal pulse width modulation (SPWM), vector control, Direct Torque Control Frequency Control,
Inverter control method now is the diversification trend, with PLC control the rapid development in recent years. PC machine can achieve a good operator of the system of control is part of the human-computer integration. Passed between PC and PLC communications, can be achieved at any time the purpose of monitoring system, so as to the fault system for the prompt exclusion, is the ideal industrial control systems.
Keywords：PLC Inverter，VVVF Automatic Control Surveillance operation Alarm
