1, whether the power supply is normal,
2. Whether the parameter setting is correct, it is normal that in some occasions, such as constant pressure water supply, it will automatically stop after reaching the target pressure, and then restart when it is less than the target pressure.
3. Whether there is a large electromagnetic harmonic in the power supply, it is best to use a power quality analyzer or a spectrum analyzer for detection.
4, inverter hardware failure. Such as hardware failures such as contactors, and so on.
Frequency converter is a kind of power control equipment which uses frequency conversion technology and microelectronics technology to control AC motor by changing the frequency mode of motor working power supply. The frequency converter is mainly composed of rectifier (AC to DC), filter, inverter (DC to AC), braking unit, driving unit, detection unit and microprocessor unit. The inverter can adjust the voltage and frequency of the output power supply by switching the internal IGBT, and provide the required power supply voltage according to the actual needs of the motor, so as to achieve the purpose of energy saving and speed regulation. In addition, the inverter also has over-current, over-voltage, overload protection and other protection functions.
Its basic principle is: the main circuit is the power conversion part that provides voltage regulation and frequency modulation power supply for asynchronous motor, and the main circuit of frequency converter can be roughly divided into two types: voltage type is the frequency converter that converts DC of voltage source into alternating current, and the filtering of DC loop is capacitor. Current mode is a frequency converter that converts DC of current source into AC, and its DC loop filter is inductance. It consists of three parts: a rectifier that converts power frequency power supply into DC power, and a smoothing circuit that absorbs voltage pulsation generated by converter and inverter.