What are the requirements of the vector inverter for the surrounding environment when it is working?

1) Working temperature: As a high-power electronic component, the vector inverter is easily affected by the working temperature, and the general temperature requirement is 0~55. However, in order to ensure safe and reliable operation, it is necessary to leave room when using it and control it below 40. The vector inverter should generally be installed on the upper end of the control box in strict accordance with the installation requirements of the product manual. It is not allowed to install heating elements or heat-prone parts at the bottom of the inverter.

2) Ambient temperature: When the temperature is too high and the temperature changes greatly, condensation is easy to form inside the vector inverter, resulting in a significant decrease in insulation performance and even a short circuit accident. If necessary, desiccant and heater should be added to the box.

3) Corrosive gas: If the concentration of corrosive gas in the use environment is high, it will not only corrode the wires and circuit boards of the components, but also accelerate the aging of plastic devices and reduce insulation performance. In this case, the control box should be made into a closed structure for ventilation.

4) Vibration shock: When the control cabinet with the inverter is subjected to mechanical vibration shock, the electrical contact is poor. In this case, in addition to increasing the mechanical strength of the control cabinet and keeping away from vibration sources and impact sources, anti-vibration rubber pads should be used to fix vibration components such as electromagnetic switches inside and outside the control cabinet. After using for a period of time, check and repair the equipment.

Electrical environment:

1) Prevent electromagnetic interference. During use, a large amount of interfering electromagnetic waves will be generated around the vector inverter due to rectification, frequency conversion, etc., which will cause certain interference to adjacent equipment. To this end, the instruments and electronic systems in the cabinet should be made of metal shells to shield the interference of the inverter to the instrument. All parts must be reliably grounded. In addition, shielded control cables should be used to connect electrical components, instruments and instruments, and the shielding layer should be grounded. If electromagnetic interference is not handled properly, the entire system will not work, and the control unit will fail or be damaged.

2) Prevent excessive input pressure. The input power of the vector inverter usually has overvoltage protection. However, if the input voltage lasts for a long time, the input of the inverter may be damaged. Therefore, in practical applications, it is necessary to check the input voltage, single-phase, three-phase and rated voltage of the inverter. Especially when the power supply voltage is very unstable, a voltage stabilization device should be set, otherwise serious consequences will occur.

A properly grounded inverter can improve the sensitivity of the system and suppress noise. The smaller the E(G), the better the grounding resistance. The cross-sectional area of ​​the grounding wire shall not be less than 2mm2 and the length shall not be less than 20 m. The grounding of the vector inverter must be separated from the grounding point of the power equipment and shall not be shared. The shielding layer of the input line should be connected to E(G), and the other end of the shielding layer should not be grounded, otherwise it will cause signal changes and system oscillation. Electrical connection should be made between the inverter and the control box. If the actual installation is difficult, a copper wire jumper can be used.

Lightning protection measures:

The lightning absorption network is generally located inside the vector inverter, mainly to prevent the vector inverter from being damaged by instantaneous lightning strikes. However, in actual work, especially when introducing overhead power lines, it is difficult to meet the requirements by relying solely on the absorption network of the inverter. This problem is especially important in places with lightning. If the power supply is an overhead incoming line, a special lightning arrester for frequency conversion should be installed on the incoming line, or a steel pipe should be buried 20m away from the inverter for special grounding protection. When the power line is imported, a lightning protection system should be set up in the control room to prevent lightning from entering the equipment. Practical application proves that this method can effectively solve the problem of lightning strikes.