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line reactor (also called an input reactor) is installed before the VFD and protects the drive, while a load reactor (also called an output reactor) is installed after the VFD and protects the motor. When a current wave form is not sinusoidal, it's said to contain harmonics. A line reactor is essentially an inductor—a coil of wire that forms a magnetic field as current flows through it. The magnetic field limits the rate of rise of the current, which reduces harmonics and helps avoid unnecessary tripping of the drive. INPUT LINE REACTOR Our team of experienced engineers recommends that all variable frequency drives should include reactors, at a minimum, for control of harmonics and power system pollution. Line reactors are the commonly preferred method of harmonic correction due to their effectiveness, reliability, and low cost. AC line reactors, or a combination of ac and dc reactors, will provide enhanced surge protection in addition to harmonic mitigation.
