Product Description:

The RD52.2-4B-018-L-A2-FW/S133 is a drive controller manufactured by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. It is installed between the plant power network and the motor leads to deliver regulated AC output that follows the speed and torque commands issued by the supervisory PLC. By executing closed-loop current and voltage modulation, the unit coordinates induction or synchronous motors so conveyor lines, pumps, and machine tools stay on their programmed cycles in industrial automation.

The controller accepts mains power in the range of 380 to 480 V and is categorized as a 3 x AC converter, meaning it is intended for three-phase supply networks. Drive behavior is processed with field-oriented vector control, enabling direct manipulation of motor flux for fast torque response. The power stage is sized for a continuous output of 18.5 kW, which suits mid-frame motors in material-handling and process equipment. Internal components are kept within temperature limits by forced air cooling, as axial fans move ambient air across the heat sink to remove semiconductor losses. The input tolerance is plus or minus 10 percent, allowing the controller to remain stable when service voltage drifts during heavy plant loading or generator operation.

For controlled braking events, a built-in brake chopper diverts regenerative energy to an external resistor to prevent DC-bus overvoltage. Line-side interference is attenuated by an integrated mains filter, which reduces conducted emissions and improves compatibility with sensitive instrumentation. Energy can be maintained on the control electronics through external stand-by power, so parameter memory and diagnostics stay active during main disconnects. The unit is built to Design Generation 2. A starting lock-out function helps prevent unintended motor startup after power returns.