Regen unit RLD

Regen unit for elevators, crane systems, centrifuges etc.

Compared to the brake chopper, the REVCON® RLD is using regenerative braking instead of converting the energy into heat. The energy is fed into the network through an appropriate inverting procedure. The continuously starting feedback process creates an only minor voltage raise on the DC bus.

The regen unit REVCON® RLD was designed for non-continuous regen operation, for example for elevators, crane systems, centrifuges etc. The rated power of the RLD model is the peak braking power and can be transmitted for a duty cycle of typically 50%. The regen current waveform corresponds to the wave form of the converter input current and is thus suitable for standard industrial networks.


  • small compact size including regen choke
  • braking energy of drive systems is regenerated into the network
  • regen power can be sized to the application (e.g. 90kW drive with 30kW regen unit)
  • capacity range 4kW to 433kW
  • high flexibility: mains voltages range from 230, 400, 460, 500 to 690V
  • DC coupling of several drives possible.
  • low-loss and high-quality IGBT modules
  • high reliability: electronic overload protection for feedback operation
  • monitoring of mains voltage, phase rotation and temperature
  • high efficiency of > 98% due to effective real time control and analogous function principle
  • enables highly dynamic braking operations
  • user-friendly start-up, as no programming or settings are required
  • Significant reduction of heat loss by regenerative operation.
  • due to the innovative concept, the power feedback unit is maintenance-free
  • duty cycle 50%

Active principle energy recovery module REVCON® RLD:

  • The energy is generated from the mechanical side of the asynchronous motor when a torque is applied to the shaft.
  • The energy is fed to the DC bus via the frequency converter.
  • The voltage in the DC link of the inverter and the regenerative unit increases.
  • The energy is fed back to the mains through the energy recovery module.