Product Description:

The RD52.1-5B-055-L-FV-FW belongs to the RD 500 Drive Controllers series manufactured by Bosch Rexroth Indramat. As a three-phase converter, it manages the speed and torque of induction or synchronous motors in automated machinery and process lines, providing closed-loop regulation without mechanical contactors. By combining the power electronics, control logic, and protective functions in one chassis, the unit streamlines cabinet layouts and simplifies setup in industrial automation cells.

This controller applies field oriented vector control, which means the processor resolves stator currents into torque-producing and flux-producing components so dynamic response and steady-state accuracy are comparable to a DC drive. The inverter section is rated at 55 kW, allowing it to operate motors in conveyor, pump, or extruder duties within that continuous output range. A DC link designed for supplies up to 500 V establishes the permissible mains connection and the required insulation clearances. Thermal management relies on forced air cooling, and a dedicated fan draws air through internal heat sinks to keep semiconductor temperatures within their operating limit at full load. For rapid deceleration, the unit incorporates a built-in brake chopper, which diverts regenerated energy into external resistors so the DC bus voltage stays within safe limits.

Incoming power must be a Converter 3 × AC source that matches the rectifier topology and eliminates the need for single-phase derating. Diagnostic channels include feedback of current filter (U6, V6, W6), which allows verification of harmonic suppression performance during operation. An auxiliary circuit provides 24 V stand-by power so encoders and control boards stay energized during mains outages, preserving position data. The hardware is classified as design generation 1, which corresponds to the connector style and parameter memory format used by this version of the controller.