In those years, the main promotion method of domestic inverters was energy saving. Most users installed inverters for energy-saving renovation, hoping to save electricity and recover costs in 3-5 months. It would not matter if the inverter broke later. , because such advanced and magical equipment is almost free of charge after the cost is recovered. Users are also happy to see the results, and they feel full of satisfaction in taking advantage of it. At that time, energy-saving renovation companies came one after another, and the energy-saving renovation of an injection molding machine was 1,800 yuan/KW; the energy-saving company with an electric meter shared the saved electricity bill with the user 7:3 in the first half of the year, with one reduction at a time. The contract period is generally 3 years, and a 315KW The story that energy-saving renovation of frequency converters can make an energy-saving renovation company prosper is still vivid in our minds. So it doesn’t matter whether it’s bad or not, as long as it saves money, everything is fine!

 Energy-saving companies are generally leather companies. How many people can afford 150,000 to buy a 200KW imported inverter? So the opportunity came for domestic inverter manufacturers to knock on a copper plate with an iron case, make a power board, and buy IGBTs. Infineon did not exist at that time, and Ximenkang’s 3-piece driver board cost 1,500 yuan * 3 = 4,500 yuan. , so domestic inverters with a capacity of more than 200 kilowatts came out, but Chinese people are still more cautious. Generally, high-power inverters have to run with load for 72 hours before leaving the factory, and such a large machine manufacturer basically agrees to on-site debugging. Domestic inverters A 200KW machine costs 50,000 yuan +, and the customer level also costs tens of thousands yuan more. It was still quite profitable at that time. Therefore, it was normal for the inverter to break down again in 2000, so I contacted the customer, analyzed the problem, and started repairing the machine after a lot of rhetoric. The inverter manufacturer's salesmen, service engineers, and R&D personnel just stayed up late at night to analyze the problem. To improve the product, work hard to identify the 5 possible reasons among the 20 most likely causes. Salesmen usually don't forget to talk about things during the mid-year and year-end summaries. Wei Wei's sales performance is poor and he finds some excuses. The boss listens to similar reports tirelessly and has no temper, because the products in those years were indeed like this.