Product Description:

The RD51.1-4B-004-L-NN-FW drive controller is produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. As a closed-loop power electronics module, it regulates induction motor speed and torque in automated material handling, packaging, and process machinery. By translating control signals into regulated output voltage and frequency, the unit allows the connected motor to respond to changing load demand while maintaining repeatable motion profiles. Because voltage and frequency are controlled together, the drive suits variable-speed equipment that benefits from smooth acceleration, controlled deceleration, and stable operation during changing process conditions.

To match worldwide plant power grids, the controller accepts a nominal line of 380 to 480 V and is configured as a converter for three-phase AC. Speed modulation is executed with U/f curve control, which maintains the volts-per-hertz ratio so induction motors develop constant flux across the adjustable range. Thermal management relies on forced air cooling, so installation space must permit unobstructed airflow through the heat-sink channel. For electromagnetic compatibility, an integrated mains filter suppresses conducted noise before it returns to the supply. This arrangement supports general-purpose motor control where simple and stable speed adjustment is required.

A built-in brake chopper diverts dynamic energy from overhauling loads to a braking resistor instead of returning it to the DC link. This function is useful during deceleration on applications that regenerate energy back into the drive. Input variation of up to ±10% is tolerated by the power stage, helping the device remain stable where utility voltage drifts are common. The unit is design generation 1, and the operating program is ordered as a separate subposition. The base unit ships without additional application-specific functions, so the final feature set depends on the selected operating program.