Examination and training of advanced operation skills of maintenance electrician Test question 1. Design, installation and debugging of relay contact control circuit There is a production equipment driven by a two speed three-phase asynchronous motor. The model of the two speed three-phase asynchronous motor is yd123m-4 / 2. According to the requirements of the processing technology, the motor automatically switches operation, and has overload protection, short circuit protection, voltage loss protection and undervoltage protection. An electrical control circuit with automatic variable speed two speed operation is designed, installed and debugged. Assessment requirements: (1) circuit design: draw the circuit diagram correctly according to the proposed electrical control requirements.According to the circuit diagram you designed, put forward the main material list. (2) component installation: according to the requirements of the given materials and drawings, correctly use the tools and instruments, and skillfully install the electrical components. The layout of the components on the distribution board shall be reasonable, the installation shall be accurate and tight, and the button box shall not be fixed on the board. (3) wiring: the wiring shall be beautiful, tight and free of burr, and the conductor shall be provided with trunking.The power supply, motor wiring and button wiring shall be connected to the terminal strip. The wires in and out of the trunking shall be provided with terminal label, and the outgoing end shall be provided with different radial pressure terminals. (4) power on test: correctly use electrical tools and multimeter, and conduct careful inspection. It is better to have a successful power on test, and pay attention to personal and equipment safety. (5) the full score is 40 and the examination time is 240 minutes. Test question 2. Measure the peak to peak value of AC signal with dual trace oscilloscope Assessment requirements: (1) the peak to peak value of 1000 Hz AC signal sent by low frequency signal generator is measured by dual trace oscilloscope. (2) the full score is 10, and the assessment time is 20 minutes. Negative item: 10 points will be deducted for damage of instruments and meters. Write out the working principle of three-phase asynchronous motor Assessment requirements: (1) preparation: teaching aids and demonstration tools are complete.A4 paper. (2) Lecture: ① the theme is clear and the focus is prominent. The language is clear, natural and the words are correct. (3) the full score is 10, and the assessment time is 45 minutes. Negative item: 10 points will be deducted if the guidance content is not correct or the content cannot be expressed correctly. Test question 4. The control circuit of three-phase asynchronous motor star delta circuit is reformed by PLC, and it is installed and debugged Assessment requirements: (1) circuit design: according to the given relay control circuit diagram, list the PLC control I / O port (I / O) element address distribution table, design the ladder diagram and PLC control I / O port (I / O) wiring diagram, and list the instruction table according to the ladder diagram. (2) installation and wiring: ① according to the PLC control I / O port (input / output) wiring diagram, the analog wiring board shall be installed correctly, the components shall be arranged reasonably on the wiring board, the installation shall be accurate and tight, the wiring wires shall be tight and beautiful, the wires shall be provided with trunking, the wires shall be provided with terminal label, and the outgoing end shall be provided with different diameter pressure terminals. ② install fuse, contactor, relay, change-over switch and PLC on one wiring board, and install button on another wiring board. (3) program input and debugging: proficient in PLC keyboard operation, able to correctly input the programmed program into PLC; conduct simulation debugging according to the action requirements of the controlled equipment to meet the design requirements. (4) power on test: correctly use electrical tools and multimeter, and conduct careful inspection. It is better to have a successful power on test, and pay attention to personal and equipment safety. (5) the full score is 40 and the examination time is 240 minutes. Test question 5. Pulse period measurement with dual trace oscilloscope Assessment requirements: (1) the period of the rectangular wave emitted by the pulse signal g

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