Product Description:

The RD52.1-4B-075-L-NN-FW is a drive controller manufactured by Bosch Rexroth Indramat and positioned in the RD 500 Drive Controllers series. It regulates the speed and torque of three-phase induction or synchronous motors in automated production cells, providing the power conversion and closed-loop regulation needed for conveyors, pumps, and processing axes to follow programmed motion profiles. The unit is part of generation 1 and is intended for applications that require controlled acceleration, stable running speed, and predictable deceleration. That operating role allows the drive to respond to changing load conditions while maintaining consistent motor behavior during normal production cycles.

Its continuous output is rated at 75 kW, allowing the unit to supply substantial power to mid-scale machinery without derating. The input window of 380 to 480 V matches common factory mains, and a tolerance of ±10 % keeps the drive operating during moderate line fluctuations. The controller uses field-oriented vector control, which supports fast torque response by regulating flux and current components separately. A built-in brake chopper redirects regenerated energy into an external resistor, protecting the DC link from overvoltage during rapid deceleration. This is useful when high-inertia loads return energy to the drive during frequent stopping cycles.

Thermal management uses forced-air cooling, so cabinet airflow must be maintained to keep the heat sinks within an acceptable temperature range. An integrated mains filter suppresses conducted emissions, which can reduce the need for extra line components in the panel. The supply configuration is converter 3 x AC, meaning the controller rectifies a three-phase input before the IGBT inverter stage. This arrangement supports standard industrial power distribution and provides the DC bus required for controlled motor output. Clear ventilation paths are important because restricted airflow can raise internal temperature during sustained operation.