inverter power semiconductor devices is the use of role will be off-frequency power conversion to electrical energy of another frequency control devices, power inverter frequency is achieved by changing the motor speed adjustment device, with the Frequency Control is an ideal high efficiency, High-performance speed control means. P LC Control Variable Frequency Test System is a research technician with the teaching self-made electrical equipment. Developed through the project in improving the experimental teaching conditions, Technical staff and teachers to improve research, Level of teaching and strengthening laboratory construction, have played a positive role. We developed P LC Control Variable Frequency Test System financial CPU224P LC, Inverter, Motor, Button Light and switching power supply is equal to one, vivid,ly: Arial; mso-ascii-font-family: Times New Roman ; mso-hansi-font-family: Times New Roman "> easy to understand the students observe the wiring and other external hardware. in teaching and high P LC workers, Research technicians played a good effect. 1, the control system structure control system core is based on
Siemens S72 200 CPU224 and
Mitsubishi Inverter (FR2 S540E2 0. 4K2 CHT)-based, CPU module with the overall structure, its small size, Low price, CPU module, I / 0 module and power supply mounted in a box chassis, the front cover has the following mode selection switch, Analog potentiometer and expansion module connector. I / 0 module 14 points in the input and output
Mitsubishi Inverter required a good grounding. (3) to run and debug Mitsubishi Inverter parameter setting: switch Press the PU / EXT key, switch EXT PU operation mode and external mode of operation. PU operation mode, set the P79 “ 0 ” ansi-font-family: Times New Roman "> press SET button. parameter clear CLR “ 10 ” , Expansion function display P30 “ 1 ”, in light of the specific project input P4, P5, P6, P7, P8, P24 and P25 Press SET to confirm the corresponding parameter values, and finally press the MODE key twice to confirm. And the external operation mode press the EXT run and debug into the project. 3, PLC control system features Frequency Test P LC Control Variable Frequency Test System can be applied to student understanding of experiment, e = "font-family: Arial; mso-ascii-font-family: Times New Roman ; mso-hansi-font-family: Times New Roman "> application of practice, advanced work, Research technician with; available P LC Control Variable Frequency Test System for the project to import, task-driven method of teaching, and completed according to different needs of different teaching content; using P LC Control Variable Frequency Test System flexibility is good, Strong anti-interference and the high degree of automation; the device independent, as long as access to 220V AC power to relay the input and output lines, you can find out addresses assigned to conduct various tests, required for a variety of DC power, P LC s hardware devices is also provided by the experimental system, only to change the application can have high reliability, Good flexibility = "Font-family: Arial; mso-ascii-font-family: Times New Roman ; mso-hansi-font-family: Times New Roman "> highlight the relevance of teaching IV Conclusion the control system PLC, Inverter, Motor and the corresponding sensor organically combine their respective advantages, matching, beautiful interface, Simple, makes the system very easy to debug and use. Practice has proved that the developed PLC control frequency control test system is simple, Convenience of operation, the safety equipment in teaching, Unique reliability. Using PLC control Frequency Test System to simulate real system operation, asn "> PLC theory and practice teaching to create a good teaching conditions and environment, in order to better train students in vocational high practical value.