Product Description:

The RD52.1-4B-018-L-NN-NN-NN-FW is a drive controller manufactured by Bosch Rexroth Indramat and assigned to the RD 500 Drive Controllers series. It governs AC motors within automated machinery, translating higher-level process commands into precise current and voltage patterns that maintain motor speed, regulate torque, and synchronize motion sequences across production cells. By integrating into cabinet-mounted control racks, the device forms the interface between plant PLCs and power electronics, making it a central component of industrial automation.

Its power section is rated for a continuous output of 18.5 kW, supplied from a three-phase mains input that can vary between 380 to 480 V. The input uses a 3 x AC converter arrangement, so the unit rectifies and inverts each phase to form a controllable AC output. Voltage fluctuations of up to ±10 % are tolerated without derating, which supports operation in facilities with unstable grids. Closed-loop regulation is achieved through field-oriented vector control, and this algorithm computes instantaneous flux and torque components to keep the motor’s electromagnetic state aligned with command references. No optional application functions are installed, so the controller can be configured by external software for task-specific parameter sets.

Thermal and dynamic energy management is handled by the built-in brake chopper, which routes regenerated power to an external resistor during rapid deceleration. A stream of cooling air passes through heat-sink channels because the unit relies on forced air cooling. Input harmonics are reduced by an integrated mains filter, which helps the upstream supply remain within tolerance. The hardware layout follows design generation 1, so mechanical dimensions, connector positions, and software tools match other first-generation members of the series.