Line Reactors are used on VFD line inputs to protect drives from current spikes, increase impedance and reduce harmonics created by the VFD. On VFD outputs, line reactors protect motors, allow cooler running, and recommended for VFDs with non-inverter-duty motors, for any motor wiring less than or equal to 100 feet. For distances over 100 feet, use of the VTF output filter is recommended.
Input line reactors protect the AC drive from transient overvoltage conditions typically caused by utility capacitor switching. Input line reactors also reduce the harmonics associated with AC drives and are recommended for all installations.
Output line (load) reactors protect the motor insulation against AC drive short circuits and IGBT reflective wave damage, and also allow the motor to run cooler by “smoothing” the motor current waveform. They are recommended for operating “non-inverter-duty” motors, and for any motors where the length of wiring between the AC drive and motor is less than or equal to 100 feet.