Product Description:

The RD52.1-5N-055-L-FV-FW drive controller is produced by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. It operates as the central power stage in automated lines, taking three-phase mains energy and supplying regulated output to vector-controlled motors for precise speed and torque handling in conveyors, extruders, and process pumps. By adjusting output frequency and voltage to match process demand, the controller helps connected motors maintain stable acceleration, deceleration, and steady-state speed. This makes the unit suitable for applications that need repeatable torque control under changing load conditions in material transport and continuous-process equipment.

This unit delivers a rated output of 55 kW, giving it the capacity to run medium-power production axes without oversizing. The DC link is designed for supplies up to 500 V, so cabinet components must be selected for that insulation class. The input arrangement uses a Converter 3 x AC design, so the rectifier and inverter are integrated in one housing to simplify wiring. Motor regulation is executed with field-oriented vector control, which separates stator current into torque-producing and flux-producing components for fast load response. Thermal management relies on forced-air cooling; a built-in fan pulls ambient air through the heat sink, so airflow paths inside the cabinet must stay unobstructed.

The unit operates without a built-in brake chopper, so dynamic energy must be handled by an external chopper or returned to the supply. For standby logic, the controller accepts external 24 V standby power, which allows the control circuits to remain active when the main bus is off. Keeping the low-voltage supply alive when the power section is inactive allows fault memory, control logic, and interface functions to stay available for system monitoring. Drive status can be supervised through current filter feedback (U6, V6, W6), which routes filter current signals to diagnostic terminals. The hardware is classified as Design Generation 1. These signals provide additional operating visibility and can help identify abnormal filter current behavior during runtime.