One. Safety Precautions
1. First of all, it is necessary to have certain electrical professional knowledge, and understand the job site, understand the equipment status, and have certain electrical operation technology.
2. Determine the voltage level of the equipment (such as low-voltage AC380V), whether it is low-voltage equipment, and verify whether the equipment is live.
3. When working with electricity, you need to wear insulated shoes, insulated gloves, or stand on a boring wooden board. When working with electricity, you need to wear insulated shoes, insulating gloves, or standing on a boring wooden board, and the tools used must have complete insulation protection, and should not touch the power supply and metal frame of different phases.
4. When the power is off, it is necessary to deal with the operation ticket, carry out the power outage, check the electricity, install the grounding wire and install the safety fence or hang the safety guard belt.
5. When carrying out low-voltage equipment or line operations, more than two people are required to carry out the operation, and full-time personnel are set up to supervise them.
Two. Installation precautions
1 Installation Environment
(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 additional 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 air around the inverter is ≤ 95% (no condensation), and the drying agent 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 avoid oscillation and impact. As we all know, the inverter is assembled by welding, screw connection and other methods. When the inverter or the control cabinet equipped with the inverter is subjected to mechanical oscillation or impact, it will cause the solder joints, screws and other connecting equipment or connectors to loosen or fall, causing serious problems such as poor electrical contact and even short circuit during the formation 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 an anti-seismic rubber gasket outside the control cabinet, and install a buffer rubber pad between the equipment and the mounting plate in the control cabinet to absorb shock.
Generally, after the equipment has been running for a period of time, the control cabinet should be inspected and protected.
(4) Electrical environment
Avoid electromagnetic disturbances
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 disturbances, hardware circuit failures and software programs will occur to form operation incidents. Therefore, in order to avoid electromagnetic disturbance, the inverter should have a way to avoid electromagnetic disturbance 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; Simply affected equipment and signal lines should be installed as far away from the inverter 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.
Avoid 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 end 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 measures to prevent overvoltage at the input end of the inverter.
(5) Altitude
The inverter is installed at an altitude of less than 1000 m and is capable of outputting additional power. However, at altitudes above 1000m, its output power decreases. If the altitude of the inverter installation site is compared with the output current, 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.
(6) Other environments
Avoid installing the inverter in a place where rain drops or condensation;
Avoid the intrusion of dust, cotton wool and metal shavings;
Avoid the inverter to be installed in the occasion of oil pollution and salt;
Keep away from radioactive materials and combustibles.
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