General steps to see electrical diagrams - Solutions - Huaqiang Electronic Network

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1. See the drawing description

After getting the drawings, first read the main title bar of the drawing and the relevant instructions, such as the paper catalog, technical description, electrical component list, construction manual, etc., combined with the existing electrician knowledge, the type, nature, The role has a clear understanding of the overall picture and the key points to be expressed.

2. Look at the diagram and block diagram

Since the schematic diagram and block diagram only show the basic composition, mutual relationship and main features of the system or subsystem, it is necessary to look at the circuit diagram in detail to understand their working principle. The schematic diagrams and block diagrams are mostly single-line diagrams. Only some of the 380/220V low-voltage distribution system diagrams are partially represented by multi-line diagrams.

3. Look at the circuit diagram is the focus and difficulty of the picture

The circuit diagram is the core of the electrical diagram and the most informative and difficult to understand electrical drawings.

Looking at the circuit diagram, we must first look at the graphical symbols and text symbols, understand the role of the various components of the circuit diagram, distinguish the main circuit and auxiliary circuit, AC circuit and DC circuit. Secondly, look at the picture in the order of looking at the main circuit and then looking at the auxiliary circuit.

When looking at the main circuit, it is usually viewed from the bottom up, that is, starting from the electrical equipment, and then controlling the electrical components, and then looking to the power supply. When looking at the auxiliary circuit, it looks from top to bottom and from left to right, that is, first look at the main power supply, then look at each branch in turn, analyze the working conditions of the electrical components of each branch and its control relationship to the main circuit. Pay attention to the connection relationship between electrical and mechanical mechanisms.

By looking at the main circuit, it is necessary to find out how the load obtains the power supply, and which electrical components pass through the electrical components to reach the load and why they pass through these electrical components. By looking at the auxiliary circuit, it is necessary to understand the composition of the auxiliary circuit, the mutual connection and control relationship between the various electrical components, and their operation. At the same time, we must understand the relationship between the auxiliary circuit and the main circuit, and then figure out the working principle and the ins and outs of the whole circuit.

4. The circuit diagram is compared with the wiring diagram.

Wiring diagrams and circuit diagrams can be viewed against each other to help you see the wiring diagram clearly. When reading the wiring diagram, it should be checked from the power supply terminal according to the terminal mark and the circuit label. Find out the connection method of the line and the circuit, and find out how each branch forms a closed loop through each electrical component.

The internal and external circuits of the switchboard (screen) must be connected to each other through the terminal block. Generally speaking, there are several lines in the switchboard, and there are contacts of several lines on the terminal board, and the number lines of the external circuit can be connected only at the same number of contacts of the terminal board. Therefore, when looking at the wiring diagram, it is necessary to pay attention to the wiring of the terminal board when clearing the circuit direction inside and outside the switchboard (screen).