Product Description:

The RD51.1-4N-110-D-NN-FW is a Bosch Rexroth Indramat unit in the RD 500 Drive Controllers series. It serves as a power conversion stage between the plant mains and three-phase induction motors, allowing speed regulation on conveyor lines, pumps, and material-handling equipment that do not require closed-loop vector control. By adjusting the output frequency, the controller works with higher-level automation hardware to match motor speed to process demand during open-loop operation. Because the controller varies motor frequency and voltage together, it is suited to equipment that needs stable running speed rather than servo-style position control.

Electrical service is accepted in the range of 380 to 480 V, and the three-phase AC converter topology enables direct connection to industrial power networks. A line deviation window of ±10% helps the drive tolerate normal supply variation without nuisance trips. Continuous mechanical output reaches 110 kW, and heat is removed by a plug-through cooler that projects the heat sink outside the panel to help keep cabinet temperatures lower. Motor operation follows U/f curve control, which supplies voltage in proportion to frequency for standard open-loop speed control. Conducted emissions are reduced by an integrated mains filter, and the unit is supplied without a built-in brake chopper, so any braking resistor must be provided externally. This arrangement is commonly used where the motor follows a speed reference without encoder feedback.

The controller belongs to design generation 1, which uses a standardized backplane and parameter structure across this platform. The ordering code identifies it as a drive controller, and no application-specific options are installed in the base unit. The standardized layout keeps electrical integration consistent with other controllers in the same platform. As supplied, the unit is intended for general-purpose variable-speed applications that use the standard control package rather than a specialized feature set.