Product Description:

The RD52.2-4B-018-L-A2-FW is a drive controller produced by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. It regulates three-phase induction or synchronous motors within automated machinery by converting fixed mains power into a controlled output that meets dynamic torque and speed demands. As a controller, it forms the central element between the plant's PLC commands and the connected motor, ensuring closed-loop operation throughout repeated production cycles.

This model accepts a supply within 380 to 480 V and remains functional when line variations stay inside the specified ±10 % window. The supply uses a 3 × AC converter input, so it connects directly to standard industrial mains without an intermediate transformer. With a continuous output rating of 18.5 kW, the unit can drive midsize pumps, fans, or process axes while delivering torque under load changes. Speed and flux are regulated through field-oriented vector control, which separates magnetizing and torque-producing currents for precise response during acceleration, deceleration, and steady-state operation under changing loads. An integrated mains filter reduces conducted emissions, and the built-in monitoring circuits compare incoming voltage to the tolerance limits before enabling the power stage.

Thermal management relies on forced-air cooling; heat-sink fins are cleared by an internal fan that moves air through the chassis toward the cabinet exhaust path. A built-in brake chopper dissipates regenerative energy during rapid motor braking, preventing DC-link overvoltage during deceleration. The controller belongs to design generation 2, so its layout and parameter structure align with the second RD series release. Functional safety features include standby power from an external source and a starting lockout that blocks unintended startup after a fault or power loss.