Product Description:

The RD51.1-4N-005-L-CF-FW is a drive controller produced by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. It is intended to modulate voltage and frequency for three-phase induction motors so machine speed can match process demand while maintaining steady torque. By connecting between the plant power bus and the motor terminals, the unit serves in automation lines, conveyors, and pump stations where regulated acceleration and deceleration are required. Because it varies output frequency in step with load demand, it helps motors run more smoothly during startup and speed changes.

This controller accepts line power in the range of 380 to 480 V through a three-phase AC converter front end. At the output, it can deliver up to 5.5 kW of mechanical power to the connected motor. Speed regulation follows a U/f curve control method that maintains motor flux at low and nominal frequencies without encoder feedback. Power quality on the incoming line is improved by an integrated line filter, which reduces conducted emissions into the facility power system. The unit is design generation 1. Key electrical parameters are allowed a tolerance of ±10 % to accommodate typical utility variation and normal device drift over time.

Thermal management relies on forced air cooling, so cabinet airflow must remain unobstructed for continuous operation. The unit is supplied without a built-in brake chopper, so rapid stops that return excess energy require an external dissipative component. Application-level behavior can be selected with the programmable Combination C1 + F1 function set, which covers standard drive, fault, and monitoring routines. In applications with changing load conditions, these routines help the controller respond consistently to operating commands and status checks across the connected machine.