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At present, foreign brands in the market are quite mature in terms of Modular design, types, specifications and quality. Foreign brands have a high share in the domestic inverter market, reaching 80% . However, with the upgrading of the manufacturing industry in China, however, no matter what kind of inverter is used, attention should be paid to the ventilation, cleaning, installation quality, routine inspection and regular inspection of the installation environment, regular replacement of capacitors, cooling fans these consumption devices to improve the reliability of use. The frequency converter used by Eysturoy Carbon Chemical Co. , Ltd. can run safely for nearly 10 years through regular maintenance. Acs503 variable frequency speed controller performs well during its operation, but it is only affected by the faults of peripheral equipment and power network, and by the replacement of the equipment of the manufacturer, after the equipment failure, the spare parts are difficult to buy and the price is expensive, the main parts are damaged and have no maintenance value. At present, it has been upgraded to ABB's ACS800 something 07 something 0260 something 3 + P901 + R712 variable frequency speed regulation controller, which is safe, reliable and convenient to debug, good performance. Because this kind of variable frequency speed controller function is complete, the protection is perfect, the installment debugging is convenient, basic realization maintenance-free. It is suggested that manufacturers and users of complete sets of equipment do not need to add unnecessary peripherals. Universal Mechanical Function, maintenance-free, less water resistance than the original valve configuration, power-free and other media driven as well as automatic opening and closing with the pump, energy saving and so on. For Faulty Valves, the cover is lifted to replace the assembly and seals. There are no damageable parts and maintenance is convenient. Energy-saving products used in fluid equipment in Lingqiao waterworks are mainly frequency converters. The age of speed control technology is relatively late, mainly to spend time on the study of speed control technology. Research on the working principle of power-regulating balancer. When the regulating end of RP1 is in the central position, the amplitude of the output signal of the two channels is equal, so that the output of the two if power sources is half power. When the RP1 is out of the center, the output of one way will increase and the output of the other way will decrease, and the sum of the two powers will be controlled within the rated power value of a single machine (now set between 10% and 95%) to realize complementary power regulation. In addition,