Product Description:

The RD51.1-4B-018-L-FV-FW is produced by Bosch Rexroth Indramat and belongs to the RD 500 Drive Controllers series. It functions as an AC motor power stage that converts fixed-frequency line power into variable frequency and voltage, allowing precise speed regulation of induction machines in automated material handling, packaging, and general factory equipment. That operating method lets the drive match motor speed to process demand instead of running the motor only at full line frequency. The power section is configured as a 3-phase AC converter, so the unit supports three-phase rectification and inversion without an external transformer.

This controller supplies a continuous mechanical output of 18.5 kW to the connected motor and accepts line voltages in the range of 380 to 480 V. Within that window, the unit tolerates line deviations of ±10%, so it remains stable on power systems with moderate fluctuation. Speed adjustment is executed through U/f curve control, which keeps the V/Hz ratio proportional to help maintain torque as frequency changes. Thermal loading is managed by forced-air cooling, which uses an internal fan to pull ambient air across the heat sink and exhaust it through the rear duct. This arrangement supports steady operation at the stated power level and helps the drive handle normal industrial duty cycles.

The unit is part of design generation 1, so it matches accessories and parameter files used for the first build cycle. Deceleration energy is dissipated through a built-in brake chopper, which removes the need for an external resistor switch. A low-loss integrated line filter reduces conducted interference, while Function 1 provides feedback of the current filter on phases U6, V6, and W6 for diagnostic scopes. Function 2 offers a 24 V stand-by power input that keeps the control electronics active during brief line outages. This can help preserve control availability while the main input supply is interrupted.