Product Description:

The RD52.1-4B-037-L-NN-FW is a three-phase drive controller produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. It serves as the power interface between plant mains and an AC motor, converting fixed-frequency input into a variable output that enables precise speed and torque regulation. By applying vector-based current modulation, the device fits applications such as pumps, fans, and conveyors where coordinated acceleration profiles and feedback-aligned torque control are required.

Rated for a continuous output of 37 kW, the controller connects to a three-phase AC converter supply. It accepts line voltages from 380 to 480 V and maintains performance across a mains fluctuation window of ±10 %. Internal signal processing executes field oriented vector control, allowing independent adjustment of magnetizing and torque-producing currents so that motor flux remains optimized during dynamic load changes. These electrical limits set the maximum output capability and the permissible installation range for protective equipment such as circuit breakers and contactors, while the vector algorithm supports high torque at low speed for starting heavy inertial loads.

Burst energy generated during deceleration is dissipated by a built-in brake chopper, eliminating the need for an external resistor switch. Thermal management relies on forced air cooling; fans draw cabinet air across heat sinks to keep semiconductor temperatures within safe operating limits. Input harmonics are reduced by an integrated mains filter, which helps support plant EMC limits. This unit is classified as design generation 1. It is supplied without additional application functions or preinstalled option boards, allowing I/O or communication features to be selected for the target machine architecture.