變頻器外文文獻(xiàn)翻譯---變頻器設(shè)計使用參考-其他專業(yè)-文庫吧
2024-12-30 08:13 本頁面
【正文】 romagic switches have a vibration ponents. Equipment operation after a period of time and should conduct inspections and maintenance. Electromagic interference: Inverter at work due to rectification and frequency, produce around a lot of electromagic interference, these highfrequency electromagic waves in the vicinity of the instrument, apparatus, a certain interference. Therefore, the cabi instrumentation and electronic systems, it should be optional metal, shielding the inverter instrument interference. All the ponents should be reliable grounding, in addition, the electrical ponents, equipment and instrumentation should use the connectivity between the shielding control cables, and the shield should be grounded. If handled properly electromagic interference, often cause the entire system does not work, leading to the control unit failure or damage. 2) Drives and determine the distance between the electrical cables and wiring methods Drives and motor the short distance should be as much as possible. This reduces the capacitance of the cable, reducing the emission source of interference. Control cables optional shielded cable, power cable or optional shielding from the cable converter to use all the threads of the electrical shield. Electric cables should be independent of the other cable alignment, the minimum distance of 500 mm. At the same time should avoid the electrical cables and other longrunning cable lines, in order to reduce the output voltage inverter rapid changes in the electromagic interference. If the control cables and power cables cross, as far as possible so that they cross the 90degree angle. Converter and analog signals on the line and back to the main line of separation of alignment, even in the case also in the control cabi. And the analog signal converter line the best choice of unshielded twisted pair, shielded power cables selection of the threecore cable (its specifications than ordinary electrical cables in the files) or to ply with the user manual converter. 3) inverter control schematics Main circuit: the role of reactor is to prevent the highfrequency converter harmonic power through the input circuit to return to the grid by the impact of other electronic devices, in accordance with the capacity size converter to decide whether to increase reactor。 filter Converter is installed in the output, the output of highfrequency converter to reduce harmonics, when the electrical inverter to the longer distance, we should install filters. Although the frequency converter itself has all kinds of protection, but the lack of protection is not perfect, the main circuit breaker played overload, lack the same protection, selection, in accordance with the capacity to choose the frequency converter. Converter itself can be used to replace thermal overload protection relay. Control loop: the frequency with the frequency manually switch to the failure frequency can be manually cutoperation, not because of output voltage, frequency and frequencybe interlocked. 4) Inverter grounding Inverter correct grounding is to improve the system stability, the ability to inhibit an important means of noise. Inverter grounding resistance grounding terminal of the smaller the better, the grounding wire crosssection of not less than 4 mm, the length of not more than 5 m. Inverter should be grounded and power equipment to the sites separately, not in total. The shield signal converter from one end of the grounding end, the other floating air. Inverter and control of electrical between the same counter. (3) Inverter Control Design Converter should be installed in the control cabi internal control coun
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