#quality problems

Variable frequency drive belongs to electronic products, which were composed of many components. An electronic product will not correctly work if any component goes wrong. The Common failures of frequency converters are overvoltage, overload, overcurrent and overheating. They are generally caused by improper use and the operating environment. Meanwhile, there’s a particular service life for electronic products. The aging of the product will be more evident as the use of time increases.

According to The Tax Duty Calculation Regulation for Fixed Asset Depreciation, the lowest standard for electronic equipment service life is three years.  Many people buy a mobile phone and change to a new one after two or three years of use, even it's still working fine. Compared with the greater frequency of changing cellphones, people replace home appliances such as TV, computer, refrigerators, and air conditioner far less. Under proper use and good maintenance, the service life of these appliances can reach 15 years in theory, even though most people won’t use them for that long. Let’s get back to VFD, an industrial electronic part, its durability and service time is much longer for sure. It is common for some factories to use VFDs for more than ten years. Some VFDs of Japanese and German brands can be used for more than 20 years.  Of course, during its service time, the busbar capacitor will be replaced. But as long as staff take good care of the workshop environment and maintenance, the overall service life of VFD will be much longer than that of household appliances. Since the service life of VFD is so long as 10 - 20 years under normal conditions, what factors lead to some failures and shortened service life of VFD?   Here are 3 major factors that any VFD user and maintainer should know.