1. About the electrical part:
1. The input side and output side of the miniature circuit breaker are inverted.
2. The voltage of the coil of the electrical parts does not match the voltage of the drawing, especially the voltage of the small relay and indicator light is easy to error.
3. The positive and negative polarity of electrical appliances are reversed, and there are many components inside DC electrical appliances that are positive and negative, such as: electrolytic capacitors, transistors, integrated circuits, etc.... These components are very sensitive to positive and negative polarity and can easily burn out once negative pressure is applied.
2. About terminal crimping:
1. The line and the terminal are not compressed: the wire and the terminal need to be compressed, mainly to prevent the contact resistance between them is too large, when the large current passes, at the contact point, a large heating element is formed, so as to accelerate the rapid oxidation of the contact surface and further increase the contact resistance. In this case, the information will be intermittent for the signal line. In the case of power circuits, the device and the entire control panel are burned.
Treatment: After the terminal is crimped, it is used to pull with appropriate force, in case of high-power power circuit, it is necessary to use hydraulic pliers to select the current wire diameter mold to be exchanged step by step until the terminal and the wire are seamless.
2. The wire diameter does not match the terminal specification: when the wire does not match the terminal, although we feel that the wire can not be pulled out, the contact between the wire and the terminal is point contact, and the contact resistance is still very large. It will still cause the above-mentioned phenomena to occur. Treatment: In case of loose terminals or wire diameters that do not match the terminals, the wire joints must be folded back before crimping, increasing the contact area and preventing loosening.
Three: about the terminal insertion of electrical parts:
1. Insert the wire into the lower part of the miniature circuit breaker terminal and lock the terminal by reversely tightening the bolt. On the surface, the wire has been firmly pressed on the circuit breaker, but in fact, because the terminal and the end pile of the circuit breaker are not fully contacted, it is still a virtual connection.
2. The terminal rolls over or does not match the wiring of the electrical parts, and no matter how much force is added, the terminal end face can not be fully contacted with the conductive wiring of the parts.
3. When the power circuit is wired, the color sleeve or wire code is inserted into the front, so that it is directly pressed on the conductive part of the electrical parts, causing the wire and the conductive part of the electrical parts to be suspended and not fully contacted.
4. When the terminal is connected to the electrical part, more than two wires are connected to the same part, and the wires are firmly connected to the electrical parts on the surface. In fact, due to the reduction of the contact area of the wire sandwiched in the middle, it causes heat and other phenomena.
Four: about the fastening of wiring:
1. The bolt and nut are damaged and deformed, do not tighten or loosen the bolt and nut with a vise to prevent damage, and adjust the opening when using a live wrench to prevent the bolt and nut from being damaged and deformed, resulting in difficult disassembly and assembly.
2. If you find bolts and nuts that are difficult to disassemble, do not act recklessly to prevent deformation and make it more difficult to disassemble, you should give appropriate knocking, or add screw loosening agent to disassemble later.
3. When the screwdriver and the screw slip, when tightening or loosening the screw with a screwdriver, you must force the screwdriver to hold up the screw, and then tighten or loosen it to prevent the screwdriver from slipping and causing damage to the screw.
4. Bolt and nut sliding buckle, fastening wiring force should be moderate, to prevent excessive force to slide the bolt nut.
Five: About wiring:
Copper chips fall into important electrical appliances during wiring operations, and we need to pay special attention at this time, because when copper chips fall into electrical appliances, we can't see or check out the major hidden dangers.
6. About the installation of electric control box devices:
1. The inlet and exhaust direction of the cooling fan in the box is wrong, and the electric control box has good sealing, and the heat release of the heating elements in the box needs to be completed by the heat dissipation fan, if the heat is not released to the external components of the box for a long time, the overheating of the temperature in the box will affect the stability of the system.
2. When the bottom plate device is installed, it should be fixed with a nut or other way that cannot be disassembled from the front, and the components should be fixed in line with the principle of maintenance and easy disassembly.
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