Drives Service & Support

General Resources

      Drives Service & Support > 1321 > Application Techniques

The Benefits of Line Reactors – Allen-Bradley reactors help keep equipment running longer by absorbing many of the power line disturbances which can shut down your drive. Allen-Bradley isolation transformers can provide both voltage change and isolation for your variable speed drive. These designs are harmonic compensated and IGBT protected to assure optimum performance in the presence of harmonics.

Application Techniques:

At the Input of the Drive

At the input of a drive, line reactors help protect against surges or spikes on the incoming power lines and help reduce harmonic distortion.

  • Eliminate Nuisance Tripping
  • Improve True Power Factor
  • Extend Semiconductor Life
  • Reduce Voltage Notching
  • Reduce Harmonic Distortion
  • Meet IEEE-519 or EN-61800
At the Output of the Drive

In long motor lead applications, Allen-Bradley load reactors located between the drive and motor help reduce dv/dt and motor terminal peak voltages. The use of a load reactor also helps protect the drive from surge currents caused
by rapid changes in the load.

  • Protect Motors from Long Lead Effects
  • Reduce Surge Currents
  • Reduce Output Voltage dv/dt
  • Reduce Motor Temperature
  • Extend Semiconductor Life
  • Reduce Audible Motor Noise
With Multiple Drives
Multiple drives on a common power line should each have their own line reactor. Individual line reactors provide filtering between each drive to help reduce any crosstalk while providing optimum surge protection for each drive.
With Multiple Motors
When more than one motor is controlled by a single drive, a single line reactor can typically be used between the drive and all the motors. Size the line reactor based on the total motor/load horsepower.