Product Description:

The RD51.2-4B-015-L-CF-FW belongs to the RD 500 Drive Controllers series produced by Bosch Rexroth Indramat. As a converter-based drive controller, it interfaces between a three-phase mains supply and an induction motor, providing adjustable frequency and voltage for speed regulation in automated machinery and material-handling equipment. This arrangement allows smooth speed changes under varying load conditions, which can reduce mechanical shock at startup and help connected machinery respond more evenly to routine process changes.

This unit supplies a continuous output of 15.0 kW, matching medium-power pump, fan, and conveyor demands. It operates from a line window of 380 to 480 V and accepts line fluctuations within ±10 %, allowing installation on utility feeds that are not tightly regulated. Motor torque is managed by a U/f curve control algorithm, an open-loop method suited for constant-torque applications. Internal heat is removed through forced air cooling, so cabinet airflow must be maintained across the heat sink. The module is from design generation 2, and its supply topology is a converter that rectifies three-phase AC before pulse-width modulating the motor leads. A brake chopper, mains filter, and logic options are built in to minimize additional panel wiring.

A built-in brake chopper routes regenerated energy to an external resistor during rapid deceleration, preventing DC-bus overvoltage. The mains filter is integrated, which removes the need for an external RFI stage. Application-specific software features are organized as function package C1 + F1, enabling both standard control loops and basic positioning tasks. Power is drawn through a 3 x AC feed, so the controller mates directly with common industrial distribution networks. When ordering, firmware is specified as a separate subposition so updates can be selected without exchanging the hardware base.