Precautions for the installation environment of the inverter

- Jan 03, 2019-

The installation environment of the inverter is very important. It can extend the life of your inverter. It can also eliminate the cost of many inverters. The following explains the installation environment and precautions of the inverter. In order to avoid unnecessary maintenance, the inverter costs and extension. Please read the service life of the inverter carefully.

(1) Ambient temperature:

Like other electronic equipment, the frequency converter has certain requirements on the ambient temperature, generally "-10 ~ +40 ° C". Since the inverter is a high-power electronic device, it is highly susceptible to the operating temperature. However, in order to ensure the safety and reliability of the inverter, it should be considered to leave room for use, preferably below 40 °C; 40~ For derating between 50 °C, the rated output current must be reduced by 1% for every 1 °C increase. If the ambient temperature is too high and the temperature changes greatly, the insulation of the inverter will be greatly reduced, affecting the life of the inverter.

(2) Ambient humidity:

The inverter has the same requirements for ambient humidity as other electrical equipment. The relative humidity of the surrounding air of the inverter is ≤95% (no condensation). The desiccant and heater should be placed in the inverter cabinet according to the working environment of the site.

(3) Corrosive gas:

If the concentration of corrosive gas is large, it will not only corrode the leads of the components, printed circuit boards, etc., but also accelerate the aging of the plastic devices and reduce the insulation performance.

(4) Vibration and shock:

During the operation of the inverter, care should be taken to avoid vibration and shock. When the inverter or the control cabinet of the inverter is subjected to mechanical vibration or impact, the connection device or the connector such as the solder joint or the screw may be loose or fall off, causing serious electrical contact failure or even a short circuit such as a short circuit during the period. Therefore, in addition to improving the mechanical strength of the control cabinet, away from the vibration source and the impact source, the inverter should also be equipped with an anti-vibration rubber gasket outside the control cabinet, and a buffer rubber between the device and the mounting plate in the control cabinet. Pad, shock absorption. Generally, after the equipment is running for a period of time, the control cabinet should be inspected and maintained.

(5) Electrical environment:

●Protect electromagnetic interference

The electrical main body of the frequency converter is the hardware and software circuit of the power module and its control system. When these components and software programs are subjected to certain electromagnetic interference, hardware failures and software programs may cause flying accidents. Therefore, in order to avoid electromagnetic interference, the inverter should have measures to prevent electromagnetic interference according to the electrical environment. For example, the input power line, output motor line, and control line should be far away; the easily affected equipment and signal lines should be installed away from the inverter as much as possible; the key signal lines should use shielded cables. It is recommended that the shield be grounded by 360° grounding method. .

● Prevent input overvoltage:

The main circuit of the inverter is composed of power electronics. These devices are very sensitive to overvoltage. Overvoltage at the input of the inverter will cause permanent damage to the main components. For example, some factories have their own generators, and the grid fluctuations will be relatively large. Therefore, there should be preventive measures for the overvoltage of the input terminals of the inverter.

(6) Altitude:

The inverter can be installed at rated altitude below 1000m above sea level. However, if the altitude exceeds 1000m, the output power will decrease.

(7) Other environments:

● Avoid installing the inverter in places where rain drops or condensation;

● Prevent dust, cotton wool and metal fines from entering;

● Avoid installing the inverter in places with a lot of oil and salt;

● Keep away from radioactive materials and combustibles.

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