Product Description:

The RD52.1-4B-132-F-NN-FW belongs to the RD 500 Drive Controllers series from Bosch Rexroth Indramat. As a drive controller, it regulates induction or synchronous motors in production lines, conveyors, and processing equipment where precise speed and torque control are required. The unit forms the central power stage between the plant’s supply and the motor, converting fixed-frequency utility power into a variable-frequency output that an automation system can command. This arrangement allows the controller to manage acceleration, steady running, and deceleration within the same installation.

The controller accepts a line voltage of 380 to 480 V and uses a Converter 3 × AC input configuration, meaning it draws three-phase power directly from industrial mains. Within this operating range, it tolerates supply variations of ±10 % without shutting down, which helps it remain stable during moderate line fluctuations. A continuous output capacity of 132 kW makes the unit suitable for high-power machinery, and it uses field oriented vector control to regulate current in real time so motor torque remains steady at low speed and during changing loads. This control method also improves speed regulation when the driven machine sees varying process demand.

Dynamic braking energy is dissipated through a built-in brake chopper, so no external resistor switchgear is required for rapid deceleration cycles. An integrated mains filter reduces conducted electromagnetic noise, which can simplify cabinet layout in many installations. Thermal management relies on forced air cooling with integrated liquid circulation. Fans move air across a heat exchanger connected to a liquid loop, helping keep semiconductor temperatures stable during heavy loading and long operating periods. The unit is Design generation 1, and optional application-specific functions are not installed.