Product Description:

The RD51.1-4N-011-L-C1-FW is a drive controller manufactured by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. In an automated plant, it links a three-phase supply to an induction motor and converts fixed mains voltage into a variable output that controls motor speed and torque. By adjusting frequency and amplitude, the unit keeps conveyors, pumps, or fans running at the commanded rate while helping protect the motor against overload. This operating method suits variable-speed applications where process demand changes during normal machine operation.

This model employs U/f curve control, so voltage rises in proportion to output frequency and supports stable torque over a wide speed range. Input power is accepted through a three-phase AC input, matching common industrial supply arrangements. The permissible line spans 380 to 480 V, allowing installation on both 400 V and 460 V networks without tap changes, and the electronics tolerate a line variation of ±10 % before tripping. Internally, heat is removed by forced air cooling, and a dedicated fan directs airflow along the heat sink so the controller can deliver full current in crowded cabinets. Because the voltage-to-frequency relationship remains proportional, the drive is well suited to general-purpose motor control in fans, pumps, and similar continuous-duty equipment.

For dynamic braking events, the unit is supplied without a built-in brake chopper, so rapid deceleration requires an external chopper or resistor bank. Control electronics remain energized during mains outages through a 24 V standby power input, allowing communication and parameter retention while the power section is off. Harmonic attenuation is assisted by an integrated mains filter, which helps curb conducted emissions on the supply line and can reduce the need for added line-conditioning components. The unit is Design 1. This layout allows the control section to remain available even when incoming power to the motor section is removed.