Product Description:

The RD52.1-4N-200-R-NN-FW is a drive controller produced by Bosch Rexroth Indramat in the RD 500 Drive Controllers series. It is intended for large-scale industrial automation and converts three-phase line power into regulated output for precision motor operation. This type of control supports demanding applications such as conveyor lines, mixers, and extruders, where stable speed, repeatable torque, and consistent response are important during continuous operation and load changes. It is commonly installed where large motors must follow process setpoints smoothly without abrupt speed drift.

The controller accepts a three-phase supply over a 380 to 480 V range and can tolerate line variation of ±10 %, allowing use on plant networks where incoming voltage is not perfectly constant. Internally, it is configured as a 3 x AC converter, so the rectifier and DC link are suited to heavy cyclic loads. The unit can deliver up to 200 kW of continuous output, which suits high-inertia machinery that must run under sustained demand. That arrangement supports production equipment that sees repeated acceleration, deceleration, and long duty cycles. An integrated line filter reduces conducted emissions, so a separate input filter is often unnecessary.

Thermal management relies on liquid cooling with an internal pump for units rated at 132 kW or higher, which circulates coolant through the heat sink and helps keep semiconductor temperatures stable. Motion commands are executed with field-oriented vector control, allowing real-time adjustment of stator current for accurate torque response across changing loads. Because heat is moved through a coolant circuit, cabinet air temperature rises less than with air-cooled power sections. The power stage is supplied without a built-in brake chopper, so regenerative energy must be returned to the line or handled by an external unit. This controller belongs to design generation 1, and its option slots are not equipped, leaving space for only the interface cards required by the application.