Product Description:

The RD52.1-4B-132-R-W1-FW is a drive controller built by Bosch Rexroth Indramat and belongs to the RD 500 Drive Controllers series. As an AC-converter-based unit, it regulates three-phase induction motors by matching commanded torque and speed through precise current modulation. In industrial machinery, it links the power stage to programmable logic or motion controllers while monitoring protective limits during operation. The configuration is intended for high-power applications that need compact cabinet integration and stable closed-loop motor control under changing loads.

The controller operates from a mains range of 380 to 480 V and tolerates line variations of ±10% without derating. It uses field-oriented vector control, so motor current is separated into flux-producing and torque-producing components for responsive speed and torque regulation. Input energy enters through a three-phase AC converter section that feeds the intermediate DC link before pulse-width modulation at the output stage. A rated output of 132 kW supports large pumps, compressors, and other process drives that require sustained motor power. Power, control, and diagnostic connections are arranged in separate terminal groups, which helps keep wiring organized inside the cabinet.

For power stages at this output level, the housing includes a built-in brake chopper to dissipate regenerated energy during rapid deceleration. Thermal management relies on liquid cooling with internal pump, which supports high current density while helping keep cabinet air temperature stable. Line-side interference is reduced by an integrated mains filter, so additional external filtering is not typically required. Main bus bars are provided as 95 mm² terminals C and F to accept the larger conductor cross-sections used in high-current installations. This arrangement supports heavy-duty motor connections while keeping the power path direct and easy to follow.