The inverter mainly has the following functions:
1. Soft up
The direct launch of the inverter motor will have a severe impact on the power grid, and it will also have too high requirements for the capacity of the power grid, which is extremely unfavorable to the service life of equipment and power grid circuits. After the use of inverter to save energy, the use of inverter's speed regulation (V/F) function will make the starting current from small to large, strictly control the peak current, and the maximum normal operating current will not be higher than the rated current, which reduces the impact on the power grid and prolongs the service life of the equipment. The inverter can be used as a soft start, but the soft start cannot be used as a frequency converter, so the inverter is more expensive than the soft start.
Second, speed regulation
Inverter speed regulation refers to the communication of asynchronous motors. The speed of the motor is related to the frequency of the communication electricity, that is to say, as long as the frequency can be changed to reach the change speed, the inverter first converts the communication power into direct current and then converts it into a communication electricity that can be adjusted at will (0-50HZ0), so as to reach the intention of the motor speed regulation, of course, the output voltage and current of the inverter become higher with the progress of frequency.
The power frequency power supply of the inverter is generally 50Hz or 60Hz, whether it is in the household field or the production field, the frequency and voltage of the power frequency power supply are stable and unchanged. The motor operating with the power frequency power supply may cause a decrease in power when regulating the speed, and after the adjustment of the inverter, the motor can reduce the power loss when the speed is regulated.
3. Energy saving
The reason why the inverter can achieve the role of power saving and energy saving in most cases is that the frequency conversion governor controls the speed of the motor, but in fact, most of the speed regulating equipment can reach this role, so it is significant that we can not determine that the inverter is an energy-saving product.
The premise of the inverter to complete the power saving is the speed regulation characteristics of the load, those spare parts that have a greater impact on the power, such as centrifugal fans and centrifugal water pumps, etc., the conditioning effect of the inverter is significantly better than the conditioning effect after its own speed regulation operation, and the inverter can actually achieve the role of energy saving and power saving under such a premise.
If the spare parts handled by the inverter are constant torque loads or even constant power loads, then in the case of a decrease in speed, the power drop is not significant or the power is stable, so the use of the frequency converter can not achieve the same energy-saving effect as before, or even completely unable to save electricity.
Under certain conditions, the power of the DC motor is higher than the communication motor and the power factor is higher, so the communication asynchronous motor and the frequency conversion governor are not more power-saving than the DC motor and the DC governor.
Fourth, maintain strong
Short-circuit maintenance to ground, short-circuit maintenance, phase-to-phase maintenance, input phase loss maintenance, output phase loss maintenance, overvoltage maintenance, undervoltage maintenance, temperature maintenance, input and output reverse connection maintenance. Overcurrent, heat sink overheating, external alarm, overheating inside the inverter. Brake electricity, resistance overheating, motor overload, inverter overload, DC fuse circuit break, memory abnormality, keyboard panel communication abnormality, CPU abnormality, option abnormality, forced abort, output circuit abnormality, charging circuit abnormality, RS485 communication abnormality.
Fifth, the degree of automation has progressed
The control function of the inverter is now very complete, and it can be well cooperated with other control equipment and instruments to complete the centralized real-time supervision and control of systematic networking, such as DCS, PLC, servo drive, etc., which greatly improves the automation degree of production line equipment
There are many varieties of inverters, which can be divided into general-purpose inverters, high-performance special inverters, high-frequency inverters, single-phase inverters and three-phase inverters according to the different uses of inverters. According to the operating principle of the inverter, it can be divided into V/f control inverter, slip frequency control inverter and vector control inverter. In the field of industrial automation, the role and position of the inverter are insignificant and indispensable. The development of domestic inverter technology has been about 20 years, and now, domestic inverter has now occupied half of the domestic market. There are also inverters of well-known brands such as Inovance, Blue Ocean Huateng, Anbangxin, and INVT.
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