Product Description:

The RD51.1-4B-045-L-NN-FW drive controller is produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. This unit regulates three-phase motor operation in automated machinery by adjusting voltage and frequency to match application demands. Intended for panel mounting inside process lines, the controller combines power conversion, braking management, and input filtering in one housing. In typical use, it supports variable-speed equipment such as conveyors, pumps, and fans that benefit from controlled acceleration and deceleration.

The unit is rated at 45 kW, allowing it to handle medium-to-high motor loads without external power modules. It is fed by a three-phase AC input and accepts line voltages from 380 to 480 V, so it fits common 400 V industrial networks. The permissible supply fluctuation is ±10 %, which helps the controller remain suitable where mains regulation is not exact. Speed regulation follows U/f curve control, which maintains a consistent voltage-to-frequency relationship across the operating range for induction motors. This operating method supports steady motor behavior while keeping the control approach straightforward for standard industrial applications.

Thermal management relies on forced air cooling, so installation must leave clear airflow paths at the top and bottom of the housing. Overvoltage during rapid deceleration is handled by the built-in brake chopper, which dissipates regenerated energy without requiring an external resistor module in most applications. Line-side harmonics and conducted emissions are reduced by the integrated mains filter, which helps simplify plant EMC planning. The unit is a first-generation model, and optional application functions are not equipped in this version. By integrating cooling, braking support, and line filtering into the controller, the cabinet layout can remain more compact and orderly.