(1) Ambient temperature:
The inverter is the same as other electronic equipment, and has certain requirements for the ambient temperature, which is generally "-10-+40°C". Because the inverter is a high-power electronic equipment, it is very easy to be affected by the operating temperature, but in order to ensure the safety and reliability of the inverter, it should be considered to leave room for use, and it is best to control it below 40 °C; Derating between 40 and 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, which will affect the life of the inverter.
(2) Ambient humidity:
The relative humidity of the surrounding air of the inverter is ≤ 95% (no condensation), and desiccant and heater must be added to the inverter cabinet if necessary according to the on-site operating environment.
(3) Oscillation and shock:
In the process of operation, attention should be paid to prevent oscillation and impact. As we know, the inverter is assembled by welding, screw connection, etc. When the inverter or the control cabinet equipped with the inverter is subjected to mechanical oscillation or impact, it will cause solder joints, screws and other connecting equipment or connectors to loosen or fall, causing poor electrical contact and even causing serious problems such as short circuit during the period. Therefore, in addition to improving the mechanical strength of the control cabinet and keeping away from the oscillation source and impact source, the inverter should also install a shock-resistant rubber gasket outside the control cabinet, and a buffer rubber pad should be installed between the equipment and the device plate in the control cabinet to absorb the shock. Generally, after a period of operation of the equipment, the control cabinet should be inspected and maintained.
(4) Electrical Environment:
Protection against electromagnetic interference
The electrical body of the inverter is the hardware and software circuit of the power module and its control system, and when these components and software programs are subjected to certain electromagnetic interference, the hardware circuit will fail, and the software program will fly wildly. Therefore, in order to prevent electromagnetic interference, the inverter should have a way to prevent electromagnetic interference according to the electrical environment in which it is located. For example, the input power line, output motor line, and control line should be far away; Vulnerable equipment and signal lines should be kept away from the inverter device as much as possible; Shielded cables should be used for critical signal lines, and it is recommended that the shielding layer be grounded by 360° grounding method.
Protection against overvoltage at the input:
The main circuit of the inverter is composed of power electronic equipment, which is very sensitive to overvoltage, and the overvoltage at the input of the inverter will cause permanent damage to the main components. For example, some factories have their own generators for power supply, and the power grid will fluctuate greatly, so there should be precautions against overvoltage at the input end of the inverter.
(5) Altitude:
The inverter device can output the rated power at an altitude of less than 1000m. However, at altitudes above 1000m, its output power decreases. As shown in Figure 1 for the comparison between the altitude and the output current of the inverter device address, it can be seen that the altitude exceeds 1000m, and the output current of the inverter is reduced, and the output current is 40% when the altitude is 4000m, and the output current is 1000m.
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