Line reactors are recommended on GS series VFD line inputs to protect the drive from transient overvoltage conditions and reduce the effects of harmonics created by the VFD. When used on VFD outputs, line reactors protect motors from damage, allow cooler running, and are recommended when operating non-inverter-duty motors or with motor wires longer than 75 feet.
Input Line Reactors and Output Reactors for AC Drives (VFD)
Reactors for VFD (Variable Frequency Drives)
Line reactors used on the input side of
a drive 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.
Line reactors used on the output side of
a drive (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. Output reactors are recommended for operating
"non-inverter-duty" motors and for any motors when the length of
wiring between the AC drive and motor exceeds 75 feet.
Series Line Reactors
There are two series of AutomationDirect line reactors
that can be used with GS series AC Drives: the original GS series
reactors (legacy) and the newer LR series line reactors. New
applications should use the LR series of line reactors for cost
savings. NOTE: LR-Series line reactors can also be used with a
variety of other VFD brands.
LR series reactors have universal mounting feet with
multiple mounting slots, and they can replace most reactors using
the existing mounting holes. Use four bolts to mount the reactors
to the mounting panel. LR series line reactors can be used on the
input or output side of any manufacturer's AC drive.
LR series line reactor prices start at
- LR Series Line Reactors
Sizes from 0.25HP to 300HP
Single-phase VFD line reactors - 115 and 230 VAC (true
single phase reactors, no center phase winding)
Three-phase VFD line reactors - 230, 460, 575 VAC
Universal mounting feet with multiple mounting slots; can
replace most reactors using existing mounting holes
Lugs are included and attached when required
AC Variable Frequency Drives (VFD)
DC drives – (line side only)
Any type of drive that creates a non-sinusoidal waveform
Use line reactors to reduce: - voltage notching
- harmonics - potential reflective wave damage