Product Description:

The RD51.2-4B-018-L-A1-FW belongs to the RD 500 Drive Controllers series from Bosch Rexroth Indramat. As a second-generation unit, it converts three-phase mains power into a variable output that lets the system match motor speed to process demand, improving energy use and protecting mechanical components. Within automated lines, it governs conveyor sections, pumps, or fans that run on standard induction motors, supplying the adjustable frequency and voltage these loads require for precise throughput control. Because the output frequency is adjustable, the drive can reduce sudden mechanical shock during startup and speed transitions.

This controller is powered through a three-phase AC converter input and accepts a line window of 380 to 480 V, so it can be wired to common industrial distribution systems without an autotransformer. Acceptable deviation remains within a ±10% tolerance, which helps the drive stay stable when the supply network fluctuates. The inverter delivers a continuous mechanical output of 18.5 kW, supporting mid-sized production machinery. A scalar strategy based on U/f curve control maintains consistent magnetic flux in the connected motor, making it suitable for applications that do not require closed-loop vector feedback.

A built-in brake chopper dissipates regenerated energy during rapid deceleration, which often reduces the need for external braking components. Clean line conditions are promoted by the integrated mains filter, which reduces conducted emissions at the cabinet boundary. Thermal limits are managed through forced-air cooling; an internal fan draws air across the heat-sink fins, so the unit needs unobstructed ventilation paths. For safety and reduced idle power use, the logic includes external standby power capability plus a starting lockout that blocks unintended run commands.