Inverter application and maintenance methods in the fan industry The inverter is usually a speed control device that provides the driving force for three-phase AC motors in industrial production equipment, such as various fan equipments for product processing and manufacturing, and fans for boiler combustion systems. Equipment, cooling system on the drying system motor, plant ventilation systems and other occasions. The most obvious and most powerful energy-saving is the main fan of coal-fired power plants.
The fan frequency converter reads the furnace pressure, the wind speed, the air volume, the temperature and other indicators according to the production need to carry on the control and the adjustment, in order to adapt to the craft request and the operating condition, has not applied the frequency changer the control means beforehand is adjusts the damper the size, actually is the adjustment gear The size of the opening is used to adjust the controlled object. No matter the size of the production requirement, the motor always operates under the maximum power condition. In the production process, not only the control accuracy is limited, but also a large amount of energy waste and equipment loss are caused. As a result, the production cost increases, the service life of the equipment is shortened, and maintenance and repair costs for electric equipment such as motors and mechanical transmissions are high.
In addition, most of the fan-type equipments are operated by asynchronous motor direct drive, which has the disadvantages of large starting current, mechanical shock, and poor electrical protection characteristics. It not only affects the service life of the equipment, but also cannot instantaneously protect the equipment when the load is in a mechanical failure, and often the pump is damaged and the motor is also burned. High-power motors, whether they are directly started or the start of the star triangle, have different levels of impact on the power grid. Therefore, the State Grid of the country stipulates that high-current devices cannot be directly started.
In the past two decades, due to the urgent need of energy saving and the requirement for continuous improvement of product quality, the use of frequency converters has become an easy-to-operate, maintenance-free, high-precision control, and can achieve multi-functional characteristics. Began to gradually replace the damper, baffle, valve control program. Especially in industries such as cement production, iron and steel smelting, mining and thermal power generation, inverter manufacturers have proposed many methods for free installation of inverters for enterprises and dividends according to the degree of power saving, and vigorously promote the application of inverters.
Inverter can effectively solve the industrial productivity problems in many aspects. It is also the many problems in industrial automation that restrict the development of productivity, making the application of the frequency converter is the application of large-scale fan industry, conforming to the development of the times. Driven by the speed of automation, there are many R&D personnel and enterprise customers to develop and accept frequency converters, so as to achieve the effect of universal access to the entire automation industry.
When large-scale enterprise equipment maintenance personnel need to inspect, repair, and maintain the inverter, the main requirement for the tool is a multimeter. For example, the quality of the rectifier circuit is judged mainly by testing the positive and negative resistance of the rectifier diode. Good or bad, no multimeter is not enough. The general maintenance of fan frequency converters is:
The DC intermediate circuit mainly measures the capacity and withstand voltage of the filter capacitor, and it can also observe whether the safety valve on the capacitor is opened or not, and whether the leakage phenomenon is judged to be good or bad. The judgement of the quality of the IGBT power module is mainly determined by the measurement of the freewheeling diode in the power module. For the IGBT module is 100% good or bad, we also need to judge whether it can be turned on under the conditions of trigger voltage and load current. And shut down. If these judgments are met, the rest, such as the temperature of cooling, the operation of the fans, and the maintenance of the dust, will not be lost. When the circuit board is found to be damaged when the inverter is overhauled, it is recommended that it be sent to a professional inverter maintenance unit. The enterprise equipment engineering personnel generally do not have the conditions to repair electronic components.

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