Product Description:

The RD52.1-4N-200-F-V1-FW is a drive controller from Bosch Rexroth Indramat and belongs to the RD 500 Drive Controllers series. It serves as the power and regulation core for high-horsepower motor stations in industrial automation, converting incoming plant power into precisely modulated output for coordinated speed and torque control on large production equipment. Its role is to execute real-time vector algorithms that keep motor flux aligned with load demands, improving response and energy utilization during continuous-duty operation.

At the electrical interface, the unit accepts a three-phase mains feed and uses a Converter 3 × AC supply configuration. The nominal operating range is 380–480 V, and the controller tolerates line fluctuations of ±10 %, allowing stable operation on lightly regulated grids. Within this range, it can deliver up to 200 kW of mechanical power to the connected motor while maintaining the commanded speed vector. Dynamic regulation is performed through field-oriented vector control, which separates torque and flux for accurate acceleration and steady operation under changing load conditions. The unit is built in design generation 1 for this controller platform.

Thermal management relies on forced-air cooling with liquid circulation, a hybrid method that removes heat from the power modules and transfers it to a remote radiator during continuous full-load operation. An integrated mains filter reduces conducted emissions, so additional cabinet filtering is not required in the standard arrangement. The control electronics can be powered through 24 V standby power supplied externally, allowing fieldbus communication and diagnostic memory to remain active when the main bus is isolated. The unit is delivered without a built-in brake chopper, so regenerative loads require an external chopper or resistor.