Product Description:

The RD52.1-4N-315-F-V1-FW is a three-phase AC drive controller manufactured by Bosch Rexroth Indramat as part of the RD 500 Drive Controllers series. It is engineered to regulate large induction or synchronous motors used in industrial automation lines, providing closed-loop speed and torque adjustment for conveyors, mixers, and similar heavy-duty loads. As a standalone controller, it accepts converter power, monitors operating limits, and exchanges process data with higher-level PLC or motion systems during operation.

This model delivers a nominal output of 315 kW, giving it enough capacity to start and run high-inertia machinery. Motor flux is managed through field-oriented vector control, which calculates magnetic and torque-producing currents separately so dynamic response is maintained during rapid load swings. The supply section is designed for a grid window of 380 to 480 V and uses a 3 x AC converter input, meaning it rectifies and inverts three-phase mains into a variable-frequency output. Component ratings are sized with a tolerance band of ±10%, allowing the controller to ride through common line deviations without nuisance trips. No built-in brake chopper is present, so regenerative energy must be handled by an external resistor or fed back to the mains through a separate module.

Thermal management uses forced-air cooling with integrated liquid circulation; fans move cabinet air across heat sinks while an internal liquid loop extracts concentrated heat and helps reduce enclosure temperature in compact panels. Control electronics stay powered during mains outages through 24 V standby power, permitting orderly shutdown and communication checks. Line-side harmonics are minimized by the integrated mains filter, so additional RFI filters are typically unnecessary. This unit belongs to Design Generation 1.