Product Description:

The RD52.1-4N-007-D-NN-FW is a drive controller produced by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. It serves as the closed-loop interface between a plant’s PLC and the induction motor it commands, issuing torque and speed references through vector algorithms while handling protective functions such as overcurrent and thermal monitoring. By converting fixed mains energy into a modulated output, the unit supports precise motor behavior in conveyors, mixers, and general motion axes. This operating role helps the drive maintain stable motor response when load demand changes during normal machine cycles.

This model delivers a continuous output of 7.5 kW, giving it enough capacity for medium-power machinery. It accepts a line voltage from 380 to 480 V and is built as a 3 × AC converter, so all three phases are rectified and inverted internally. The permissible mains fluctuation is ±10 %, allowing stable operation even when the plant supply is not perfectly regulated. Control is executed with field-oriented vector control, which regulates stator current components separately to produce accurate torque under varying loads. To limit conducted emissions, an integrated mains filter is fitted, which reduces electrical noise returning to the supply and can simplify panel layout.

Thermal management relies on a plug-through cooler that projects the heat sink outside the cabinet so internal temperatures stay lower without large air movers. This arrangement removes a significant share of drive heat from the enclosure and helps protect nearby control components from unnecessary temperature rise. The hardware is from design generation 1. The base unit does not include optional encoder interfaces or communication cards. The controller ships without a built-in brake chopper, so applications that need dynamic energy dissipation must use an external chopper and resistor assembly.