Product Description:

The RD51.2-2B-015-L-A1-FW is a drive controller produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. It regulates three-phase induction motors in automated machinery by converting fixed line power into an adjustable output that matches process demands. Through this function, the unit supports conveyor lines, material-handling stations, and other equipment that require variable motor speed and torque under PLC supervision. Its adjustable output also helps the motor respond smoothly to changing load conditions during operation. This type of control is commonly used where process speed must change without mechanical adjustments to the driven machine.

The controller uses U/f curve control, so the voltage-to-frequency ratio remains constant while the motor accelerates or decelerates. This method suits applications that do not require vector control or servo-style position feedback. Rated output is 15.0 kW, providing enough capacity for mid-range pumps, fans, or mixers in general industrial service. Input power is accepted from a three-phase AC converter supply within an input voltage range of 200 to 230 V, allowing installation on low-voltage industrial systems without an autotransformer. Thermal management relies on forced-air cooling, and an internal fan channels airflow across heat-dissipating components to maintain stable internal temperatures. A built-in brake chopper diverts regenerated energy to an external resistor during rapid motor braking, which helps prevent DC-link overvoltage trips during deceleration.

The unit is part of design generation 2, which corresponds to the second revision of the RD 500 platform. Control electronics can remain energized through an external standby power input with starting lockout, which supports controlled restart behavior after an emergency stop or power loss. The drive is supplied with software ordered separately, allowing the control package to be matched to the intended application and control mode.