伟创变频器性能简介（Introduction of Wei Chong frequency converter performance）.docVIP

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伟创变频器性能简介（Introduction of Wei Chong frequency converter performance）.doc

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伟创变频器性能简介（Introduction of Wei Chong frequency converter performance）

伟创变频器性能简介（Introduction of Wei Chong frequency converter performance） Although the inverter has been published more than twenty years of history, but a large number of applications in recent years has made great progress. Variable frequency speed control technology is very rich in function. It is essential for every electrical design, installation, debugging and maintenance staff to correctly understand and master all kinds of basic functions and control modes of frequency converter and parameter setting method of frequency converter. In this paper, the basic knowledge of frequency converter is briefly introduced. Main circuit for frequency converter application The main circuit of frequency converter is shown in figure 1. The circuit breaker QF and the AC contactor KM are connected between the power supply and the frequency converter. When the converter is not used for a long time or the equipment is repaired, the circuit breaker is used as an isolating switch, and the power supply can be cut off to ensure the safety of the overhaul. At the same time, circuit breaker has over-current and undervoltage protection functions, the main circuit of the inverter can play a certain role in protection. The function of AC contactor is that the power supply of the frequency converter can be conveniently switched on or off through the button; two, when the frequency converter alarm output terminal is operated, the frequency converter can be quickly separated from the power supply by a contactor. Between the inverter and the motor is generally not connected to the AC contactor, but the application is indispensable: the first one is a transducer to make two or more motors, each motor shall be equipped with a contactor: second is the motor needs to switch between frequency converter and power frequency, when the motor before switch to the power supply, must advance through the connection between the inverter and the contactor cut off, obviously must also be a connection between the