1. The wiring is not tight, and the wiring is not tightened, resulting in poor contact, resulting in heat generation of the terminal block.
    2. The motor coil and the outlet terminal are not fastened, which can also cause heat.
    3. Short circuit burnout due to insufficient creepage distance between terminals due to dust and oil.
    4. Short circuit burnout due to insufficient creepage distance between terminals due to dust and oil.
    5. The surface of the terminal block and the terminal block may be oxidized, resulting in an increase in the resistance value of the contact portion and more heat generation, thereby causing a malfunction.
    6. Humidity causes the insulation resistance to become small, causing a short circuit.
    7. Short circuit occurs when the creepage distance is less than or greater than the corresponding voltage
    Generally speaking, the three-phase terminal of the motor is manufactured by the manufacturer at the factory when the distance between them is set according to the regulations. The insulation distance should meet the requirements. If the terminal frame is intact, it will not be arc due to insufficient distance. Causes a short circuit. To analyze this fault, under the premise that the motor junction box remains intact, there are two problems to be considered. First, when the terminal is burned, the coil of the motor is burnt out, and all the coils of the motor are intact, then the problem is all In terms of the terminal block, the second is that the motor coil is damaged when the terminal block is burned, and it is another matter.
    If the motor is put into use after being stopped for a period of time, the possibility of oxidation due to moisture and wiring is relatively large, and burning due to heat generated by poor contact. If the motor runs frequently, the terminal block burns out during operation. It should be judged that the terminal stud is loose, and there is a temperature accumulation for a period of time. When the humidity in the air rises, the surface of the terminal is oxidized, which will also cause The contact resistance increases, and after reaching a certain level, the phenomenon deteriorates faster and faster. In the case of a complete junction box, it is generally difficult to find, and this failure eventually occurs. Therefore, the general operational requirements for electrical equipment are also regulated. Regular inspections and inspections are good methods for reducing failures. There are opportunities for downtime. Opening the box inspection can reveal early signs of some failures.