With the increasing maturity of domestically produced frequency converters , the wide variety available can be overwhelming. Many brands have already been tested by the market, but some brands engage in imitation and counterfeiting to disrupt the market. One characteristic of domestic brands is their striking resemblance in appearance. Some domestic brands look similar to imported brands, while others resemble other domestic brands, making it difficult to discern a brand's true character and foundation, and easily leading to incorrect judgments when making a selection.
This requires us to be discerning when selecting frequency inverters, carefully observing both their external craftsmanship and internal capabilities. Methods for identifying frequency inverters:
Inverters first impress with their appearance, much like mobile phones, creating a first impression. Good inverters have a novel, streamlined design that exudes a sense of dynamism. Such designs require extensive work, from external design and mold making to the arrangement of internal components and mass production, resulting in very high costs. Generally, only imported inverter brands invest heavily in this area. For example, ABB inverters are slender, Fuji inverters are wide, and Siemens inverters are robust—each with its own distinctive characteristics.
Domestic inverter brands lack the resources to invest in these improvements, resulting in a uniform, boxy design that lacks any distinctiveness. This necessitates careful observation: which brand's mold was used to create the casing template, and whether it's an outdated model, can reveal a manufacturer's potential. While appearance isn't the most crucial factor, workmanship reflects a brand's strength. Details like the casing material and flame retardancy rating can roughly indicate cost. Disassembling the casing reveals the internal circuit board layout and the ease of opening the casing and circuit boards. Some inverters are impossible to open internally, lacking even screws; how can you repair them without them?
The workmanship of the circuit board is also readily apparent. Whether it's machine-mounted, whether it has conformal coating, the number of layers, whether there are cold solder joints, and whether copper wires are interspersed throughout the board—all these factors reveal a company's proficiency in circuit board design and layout. Poor layout can lead to potential inverter malfunctions. Next, check if the inverter modules are imported brands and their current ratings, as these directly affect the inverter's lifespan. Also, examine the inverter's capacitors; ensure sufficient capacity and use reputable brands, as these also impact performance. Finally, consider the inverter's airflow. A well-designed airflow significantly improves heat dissipation, while a poorly designed one can lead to frequent malfunctions.
If the hardware of domestically produced frequency converters is roughly the same, then software issues must be considered. Generally, frequency converters are modified versions of imported brands' software to meet requirements. However, some manufacturers lack the source code and cannot modify the main program, thus hindering performance improvements. Currently, not many domestic manufacturers possess the capability to modify frequency converter algorithms; they typically use existing main programs and adjust parameters to achieve optimal results.
The most direct way to test the quality of inverter software is to add a load test. Low frequency and high torque are direct and effective ways to test the inverter algorithm. After changing the parameters, tune the inverter to within 5Hz and see if the load motor torque decreases and if the motor speed is uniform. Also, observe whether the inverter's output waveform is perfect. In addition, perform frequent short-term starts and stops to see the current and voltage peaks. These methods can all test the performance of the inverter software.
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