Product Description:

The RD52.1-4B-200-F-FM-FW is a drive controller from the RD 500 Drive Controllers series manufactured by Bosch Rexroth Indramat. As a converter for three-phase mains, the unit interfaces between utility power and a controlled motor, providing vector-based regulation of speed and torque in industrial automation cells, conveyor modules, and processing equipment. The unit is classified as design generation 1 and uses a consistent electrical layout. This arrangement supports precise motor control in automated production and material-handling systems.

Rated output power is 200 kW, so the controller can run large process motors without additional power modules. The grid connection covers 380 to 480 V three-phase lines, and a tolerance of ±10 % helps the drive remain stable during typical plant voltage swings. Drive regulation uses field-oriented vector control, which separates torque-producing and magnetizing currents for accurate speed response even at low rpm. This control method also improves response during load changes and helps maintain smooth operation across a wide speed range. The inverter uses a 3 × AC converter topology and ships without output chokes, which helps reduce panel space while still satisfying short-cable EMC limits.

Protection and ancillary functions are handled onboard. A built-in brake chopper dissipates regenerated energy during rapid deceleration, preventing DC-bus overvoltage without external hardware. Thermal management relies on integrated forced-air cooling and liquid circulation; fans move air across heat sinks while an internal coolant path carries heat away from power semiconductors. Grid interference is reduced by an integrated mains filter that attenuates conducted noise on all three input phases. For diagnostics, the controller provides filtered current feedback (U6, V6, W6), giving real-time data on phase currents after filtering so protection thresholds can respond to actual load conditions. The combined cooling approach supports steady operation during sustained load and repeated speed changes.