Product Description:

The RD52.1-4B-110-L-NN-NN-NN-FW is a drive controller from Bosch Rexroth Indramat in the RD 500 Drive Controllers series. It serves as the regulated link between a three-phase power bus and the motors on automated machinery, adjusting voltage and frequency to match commanded torque or speed. Designed for cabinet mounting, the unit exchanges setpoints and diagnostic data with higher-level PLCs while supplying controlled energy to large conveyors, extruders, and process rolls on production lines. This arrangement supports smooth acceleration and steady operation in applications that must keep heavy rotating loads under close control.

The controller is powered from a three-phase AC converter mains feed and tolerates line potentials between 380 to 480 V. A permissible swing of ±10% lets it continue operating through moderate utility fluctuations without unnecessary shutdowns. Its power stage is rated at 110 kW, which suits high-inertia loads that require substantial continuous output. Motor regulation is handled with field-oriented vector control, so real-time current components stay aligned with rotor flux for fast torque response and stable low-speed behavior. Internal heat is removed by forced-air cooling, and the airflow path must remain clear so the heat sink can dissipate losses effectively during sustained operation.

During fast stops, DC bus energy is routed through a built-in brake chopper, which helps manage regenerated energy during deceleration without an external chopper switch. Conducted emissions are reduced by the integrated mains filter, helping the installation limit electrical noise on the supply side. The unit is design generation 1. No optional expansion cards are installed, so the base configuration remains limited to the standard control and feedback connections. This keeps the hardware focused on core drive functions for applications that do not require added option modules.