The
inverter can be controlled by PLC.
Also can control the frequency inverter by the PLC through the relay contact points.
And also can control the inverter by relay to achieve multi-speed step operation.
The relay usually composed by the iron core, coil, armature and contact spring etc. As long as there is a certain voltage on both ends of the coil, the coil will flow through a certain current, thereby generating electromagnetic effects, the armature will be attracted to the core in the attractive interaction of the electromagnetic force to overcome the return spring tension, so to drive the armature dynamic contact with stationary contacts (normally open contact) pull. Electromagnetic suction disappears when the coil is de-energized, the armature will return to its original position in the reaction force of the spring, and release of the dynamic contact with stationary contacts (normally closed contacts). This pull and release, so as to achieve conduction in the circuit for cutting purposes.
The inverter is the power semiconductor devices by frequency power conversion for another frequency energy control device, can achieve the soft starter for AC induction motor, variable frequency control, improve running accuracy, change the power factor, over current / over voltage / overload protection and other functions.
PLC programmable logic controller, a digital computing operation of electronic systems, designed for applications in industrial environments designed. It uses a programmable memory for internal storage program, the implementation of logical, sequential control, timing, counting and arithmetic operations such as user-oriented instruction and all types through digital or analog input / output control machinery or production process. It's the core part of the industrial control.