Product Description:

The RD51.1-4N-005-L-DF-FW is a drive controller produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. In variable-frequency applications, the unit converts three-phase mains power into a regulated output that adjusts induction motor speed and torque. Deployed in conveyors, pumps, and process equipment, it provides closed-cabinet mounting for consistent automation control. This operating role suits machinery that needs controlled starts, speed changes, and stable running under varying process loads.

Its continuous output is rated at 5.5 kW, providing sufficient capacity for mid-range motors in material-handling lines. The converter accepts line voltages from 380 to 480 V, and a tolerance of ±10 % lets the input fluctuate without causing undervoltage or overvoltage trips on common industrial supplies. Because the supply side uses a 3 x AC converter topology, the controller rectifies and inverts three-phase power to generate a variable-frequency output that follows the selected acceleration profile. Motor flux is regulated by U/f curve control, so voltage rises proportionally with frequency and helps avoid magnetic saturation at low speeds.

Thermal management relies on forced-air cooling, so the unit must be installed where unobstructed airflow can pass through its heat sink channel. An integrated mains filter is fitted to attenuate conducted emissions before they return to the plant supply, which reduces the need for additional external filtering components. The design is supplied without a built-in brake chopper, so rapid deceleration or regenerative braking requires an external braking resistor or a separate chopper module. Control wiring is landed on a NAMUR terminal strip, and the 24 V standby input keeps the logic section active during mains interruptions so status signals can still be passed to the supervisory PLC.