With the expanding of system requirements, there need more I/O point connected to the Programmable Logic Controller (PLC), at this time it can be achieved by matching extension module to add more number of I/O points and more features, in order to realize the control of certain conditions.
B. Industrial Power Supply Selection
This system adopts the Siemens 100 c PUS industrial power supply; it has characteristics of high reliability, high efficiency, and high integration. Satisfied the system requirements of improve work efficiency and save energy.
C. Type Selection Of Variable-Frequency Drive
Alternating current (AC) servo motor drive permanent magnet synchronous servo motors and AC asynchronous servo motors. AC permanent magnet synchronous servo motor-rotor formed by permanent magnets，Stator winding forms a rotating magnetic field，As long as the size of the load does not exceed the synchronizing torque.
Follow the rotating magnetic field of permanent magnet rotor rotates synchronously, it is similar to basic AC permanent magnet synchronous motor. AC asynchronous servo motor's stator consists of two-phase difference of 90 ° in space consisting of winding excitation winding and control.
Access and control of AC windings the phase difference excitation winding angle, so that the stator rotating magnetic field produces elliptical, rotors cut magnetic lines, under the electromagnetic force of traction to spin.
At present, in precision Computerized Numerical Control (CNC) system of AC permanent magnet synchronous motor is widely used.
With rapid development of AC variable frequency technology, some inverter is now with servo function, control accuracy with conventional AC servo and no obvious gaps, so they have a tendency to converge.
Servo drive using a digital signal processor（DSP） is used to control. It can achieve complex control algorithms, digital, networked and intelligent. Power device widely used in intelligent power module drive circuit core design, the internal integration of the drive circuit, also has overvoltage, over current, overheating, under voltage fault detection and protection circuit, in the main circuit are added in the soft start circuit, in order to reduce the impact of the starting process to drive. First power-driven units through a three-phase full-bridge rectifier circuit to input three-phase power or mains rectifier, the corresponding direct current (DC). After rectification is good three-phase current or the city electricity, then through the variable frequency three-phase sinusoidal Pulse-Width Modulation (PWM) voltage type inverter to drive the three-phase permanent magnet synchronous AC servo motor.
The whole process of the power drive unit can be simply that is the process of AC-DC- AC. Rectifier unit (AC-DC) is the main circuit topology of three phase full bridge uncontrolled rectifier circuit.
According to the electrical machine working efficiency and requirements of the equipment, selection of frequency converter is Shilin SS22-023-0.75 K, Is three-phase ac rated voltage 200-230 - v, adaptation motor power is 1.9 KW, rated current is 5.0 A, cooling is cold itself.
SHSS22 type inverter is small in size, it belongs to miniature products, takes control cabinet space is small, it debug simple and convenient. It control way is sine wave SPWM, the control performance is strong, its carrier frequency range of 0 to 15 KHZ, effective in reducing the electromagnetic noise of the motor, simulate interface is versatility, load capacity is strong, provide multi-function output terminal signal. It is mainly used in stereo warehouse system industry, food, beverage, and packaging.
D. Touch screen selection
The touch screen as the principle and the use of different materials, can be pided into resistive touch screen, capacitive touch-screen and sonic sensors, infra-red touch screen touch screen. 液体灌装机的设计英文文献和中文toyc(4):http://www.chuibin.com/fanyi/lunwen_206546.html