Product Description:

The RD52.1-4N-075-L-NN-FW is a drive controller from Bosch Rexroth Indramat that belongs to the RD 500 Drive Controllers series. Designed for cabinet installation, it receives three-phase supply power and sends a precisely modulated output to induction or synchronous motors used on conveyors, extruders, and packaging stations. The unit forms the link between the plant PLC and the mechanical axis, executing torque and speed commands while supervising current limits and operating status. Its role is to maintain process accuracy and protect the connected machinery during continuous or cyclic motion tasks.

Its rated output is 75 kW, providing sufficient capacity for mid-range motion axes without oversizing the installation. The converter section accepts line voltages from 380 to 480 V and continues to operate when the mains fluctuate within a tolerance of ±10 %. Because it is a 3 × AC converter, it rectifies and inverts each phase to create a variable-frequency waveform that the motor can follow. Closed-loop manipulation of the stator flux is performed through field-oriented vector control, enabling stable torque at very low speeds and rapid dynamic response. No application-specific function packages are installed, so programming focuses on motion parameters rather than auxiliary technology modules.

Thermal management relies on forced-air cooling, and the integral fan draws cabinet air across the heat sink to preserve semiconductor temperature under full current loading. Because the unit is supplied without a built-in brake chopper, external braking hardware is required when regenerative deceleration must be dissipated internally. An integrated mains filter attenuates conducted emissions, allowing the controller to meet common EMC limits without extra line components. The unit is Design generation 1.