Electrical schematic diagram is based on the principle of control chart drawing, with a simple structure, structured. Mainly used to study and analyze the working principle of the circuit, in order to see the electrical schematic diagram must first clear the electrical principle and its symbol of the meaning expressed. Look at the schematic look at the main circuit, look at the control circuit. For the control circuit to be familiar with the typical control circuit. Control circuit control circuit is generally by the switch, button, signal indication, contactor, relay coil and a variety of auxiliary contacts, regardless of simple or complex control circuit, are generally by a variety of typical circuits (such as delay circuit, Interlocking circuit, sequential control circuit, etc.) to control the "start", "run" and "stop" of the controlled equipment in the main circuit to make the equipment in the main circuit work normally according to the requirements of the design process.
For the complex control circuit, divided into a number of local control circuit, and then compared with the typical circuit, step by step analysis. Various electrical schematics are composed of various circuits, such as main circuit, auxiliary circuit and various electrical equipment graphic symbols and text. Each graphic symbol and text symbol in the figure have different meanings. In general, the main circuit is to supply some electrical equipment power supply. It is controlled by the auxiliary circuit, while the auxiliary circuit is used to control the electrical power supply, but also control the main circuit action circuit. Each figure and symbol in the figure marks the name and function of various electrical equipment, components, and the names and functions of the devices and components in the figure.
 The general method of looking at the map is to look at the main circuit, after the auxiliary circuit, and auxiliary circuit circuit to study the main circuit control program, see the first step is to see the main circuit which several electrical equipment, each electrical equipment Use, wiring and related requirements and contact. On the motor, for example, from the type of view is DC or AC; is asynchronous or synchronous; from the winding point is a star connection or triangular wiring; from the starting point of view is full pressure Start-up or buck-start; what kind of control is used, whether it is forward or reverse, etc. A comprehensive understanding of the interconnection and effects of other electrical components such as power switches, fuses, relays, contactors, etc. The voltage level of the electrical components, and then look at the structure of the auxiliary circuit in the figure, and according to the circuit of the auxiliary circuit to study the action of the circuit, as well as the circuit of the various components of the relationship and action contact, etc. After a comprehensive understanding of the above problems Together to see the circuit diagram together.
 The so-called electrical wiring diagram is based on the electrical equipment and electrical components of the actual location and installation of the drawing, only to represent the electrical equipment and electrical components of the location, wiring and wiring, and not clearly that the principle of electrical action. Mainly used for installation wiring, line inspection and repair and troubleshooting.
1, the wiring diagram generally shows the following: electrical equipment and electrical components of the relative position, text symbols, terminal number, wire number, wire type, wire cross-section, shielding and wire stranding.
2, all the electrical equipment and electrical components are located in the actual location of the drawing on the drawings, and the same electrical components according to their actual structure, using the same graphical symbols with the circuit diagram together, and use the dotted line box, its The letter and the number of the terminals should be the same as those in the circuit diagram to check the wiring.
3, the wiring diagram of the wire has a single wire, wire group (or line tie), cable and other points, can be used to express lines and interrupt lines. Where the wire to the same can be combined, with a harness to reach, to reach the terminal board or electrical components of the connection point and then respectively. In the case of wire harnesses, cables, etc., they may be indicated by bold lines, and may be partially bolded without misunderstanding. In addition, the wire and casing, threading tube type, number and specifications should be marked clearly.
Wiring diagram and physical contrast is not difficult to read Electrical schematic diagram is based on the principle of control chart drawing, with a simple structure, structured. Mainly used to study and analyze the working principle of the circuit, in order to see the electrical schematic diagram must first clear the electrical principle and its symbol of the meaning expressed. Look at the schematic look at the main circuit, look at the control circuit. For the control circuit to be familiar with the typical control circuit. Control circuit control circuit is generally by the switch, button, signal indication, contactor, relay coil and a variety of auxiliary contacts, regardless of simple or complex control circuit, are generally by a variety of typical circuits (such as delay circuit, Interlocking circuit, sequential control circuit, etc.) to control the "start", "run" and "stop" of the controlled equipment in the main circuit to make the equipment in the main circuit work normally according to the requirements of the design process. For the complex control circuit, divided into a number of local control circuit, and then compared with the typical circuit, step by step analysis.
 The so-called electrical wiring diagram is based on the electrical equipment and electrical components of the actual location and installation of the drawing, only to represent the electrical equipment and electrical components of the location, wiring and wiring, and not clearly that the principle of electrical action. Mainly used for installation wiring, line inspection and repair and troubleshooting.
1, the wiring diagram generally shows the following: electrical equipment and electrical components of the relative position, text symbols, terminal number, wire number, wire type, wire cross-section, shielding and wire stranding.
2, all the electrical equipment and electrical components are located in the actual location of the drawing on the drawings, and the same electrical components according to their actual structure, using the same graphical symbols with the circuit diagram together, and use the dotted line box, its The letter and the number of the terminals should be the same as those in the circuit diagram to check the wiring.