How to draw electrical drawings - Solutions - Huaqiang Electronic Network

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For industrial control electrical drawings, drawing drawings is an indispensable part of the overall design. The main considerations and techniques are these:

1. Understand the whole operation process before drawing, what are the important components in the planning system? Such as servo drives, motors, inverters, plc, touch screens, etc. The key points are the overall control ideas, the communication interface of the components, and the selection (such as motor power, speed, PLC input and output points, relay output or transistor output).

2. Familiar with the functions of various low-voltage components, such as contactors, fuses, air switches, relays, proximity switches, etc. For example, contactors are used to switch high-voltage circuits, fuses and air switches are used for component protection, and relays use AC relays and DC relays. Whether the proximity switch is normally open or normally closed is a PNP output or an NPN output. Some components need to indicate important parameters in the drawings, such as the rated current of the air switch.

3. Familiar with common wiring methods and control methods for important components. Note that the input and output of the PLC are PNP and NPN. Is the servo driver supply voltage 200V or 400V? If it is 200V, a transformer is also needed. It is clear that the difference between active high and active low is effective.

4. Pay attention to the three-phase balance when wiring the power grid. The single phase load is connected to the phase and neutral lines.

5. All types of loads, such as PE, need to be grounded.

6. Each line needs to have a label at both ends. For strong power, xx (10 to 99) mark can be used, and for weak power, xxx (100 to 999) mark can be used to distinguish. Of course, it can also be marked according to the meaning, such as PE, U1, V1, W1, CW, CCW, and so on.

7, the thickness of the line should also be marked, can be estimated according to 1mm2 corresponding to 6A, the signal line with 0.5mm2. The specific thickness also needs to be queried according to the corresponding component manual.

8. Explain the meaning of each point. The corresponding connecting lines of each point should have corresponding marking instructions on other drawings.

9. Then plan the entire system, assign input and output points, and plan control logic.

Whether you are using AUTOCAD or protel, or other software, you are familiar with it.