Product Description:

The RD52.1-4B-003-L-NN-FW is a drive controller in the RD 500 Drive Controllers series from Bosch Rexroth Indramat. Designed for panel-mounted converter systems, the unit regulates three-phase induction or synchronous motors in automated machinery. By adjusting output frequency and voltage, it controls motor speed and torque in production lines, material handling systems, and process equipment. Its panel-mounted format suits centralized control layouts where multiple electrical functions are grouped inside the same cabinet. It can also support variable-speed duties where smooth motor response is needed during repeated command changes.

On the line side, the controller accepts a three-phase AC supply within 380 to 480 V. The power stage is rated for 3.0 kW, which suits medium-size motors operating under continuous duty. Regulation uses field-oriented vector control, which separates torque and flux currents for responsive speed control and stable operation under changing loads. For deceleration, the unit includes a built-in brake chopper that sends regenerated energy to an external resistor bank. This arrangement helps manage braking energy during frequent starts, stops, or commanded speed reductions.

Thermal management relies on forced air cooling, and the airflow keeps internal power components within safe temperature limits without requiring liquid cooling. Line-side interference is reduced by an integrated mains filter, which helps simplify electromagnetic compatibility measures inside the cabinet. The unit is design generation 1, and the permissible mains variation is ±10%, so it can continue operating through normal industrial supply fluctuations. This model does not include additional programmable functions. The layout is intended for cabinet installation where airflow and line conditioning are handled within the overall drive system.