In virtually all industrial control systems, variable frequency drives (VFDs)/inverters are commonly installed at the front end of motors in order to regulate speed and save energy. Based on differing input voltage requirements, inverters are often categorized as low voltage (110V, 220V, 380V, etc.), medium voltage (690V, 1140V, 2300V, etc.), or high voltage (3kV, 3.3kV, 6kV, 6.6kV, 10kV, etc.).
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