Product Description:

The RD51.1-4N-090-L-V1-FW belongs to the Bosch Rexroth Indramat RD 500 Drive Controllers series. It is an AC drive controller intended for three-phase induction motors used in automated production lines, material handling systems, and process equipment such as conveyors, mixers, and cooling towers. By converting incoming line power into a variable-frequency output, the unit allows the motor to run only as fast as the process requires instead of operating continuously at full line frequency. This helps support smoother operation, better process control, and lower energy use in applications with changing load demands.

The controller uses a three-phase AC converter input and operates across a line range of 380 to 480 V, with a permissible variation of ±10 % to accommodate normal supply fluctuations. Under these conditions, it can provide a continuous output rating of 90 kW, which makes it suitable for larger pumps, blowers, and mixing systems. Speed regulation is based on U/f curve control, which keeps voltage and frequency proportional so the motor can maintain stable magnetic flux during operation. Because this method does not require encoder feedback, it is well suited to applications where dependable speed adjustment is needed without more complex feedback hardware.

Thermal management is provided by forced air cooling, so the unit should be installed where cabinet airflow is not blocked by surrounding equipment or wiring. An integrated mains filter helps reduce conducted interference on the supply line and can simplify panel layout in many installations. The drive is supplied without a built-in brake chopper, so braking energy from decelerating loads must be handled by an external solution when the application requires it. Auxiliary electronics can remain active through external 24 V stand-by power, which helps preserve control functions when the main power section is switched off. The device is part of design generation 1.