Product Description:

The RS51.1-4G-003-S-NN-FW is produced by Bosch Rexroth Indramat and belongs to the RD 500 Drive Controllers series. Classified as a basic drive, it interfaces between a three-phase supply and induction motors in factory handling, pumping, or ventilation systems. The unit converts fixed-frequency mains power into a variable output that supports precise speed management during automated operation. It is commonly applied where the drive must regulate fan, pump, or conveyor speed in response to changing process demand.

This controller delivers a continuous output of 3 kVA while accepting a line voltage within 380 to 480 V. That power level suits small to mid-sized motor loads in distributed machine sections and utility skids. Incoming fluctuations are tolerated up to ±10 %, allowing stable operation where plant supply conditions vary within normal industrial limits. Motor excitation follows U/f curve control, which keeps voltage proportional to frequency so the magnetic flux in the machine remains consistent across the speed range. Noise conducted back onto the plant mains is reduced by the integrated mains filter, so an external filter stage is not required and panel wiring stays simpler.

A built-in brake chopper and resistor dissipate regenerative energy during rapid deceleration, preventing DC-bus overvoltage without an additional braking module. This is useful on loads with recurring stop cycles or motion that feeds energy back into the drive during braking. The supply interface uses a 3 × AC converter supply, matching standard three-phase industrial networks used for general drive installations. The unit is part of Design Generation 1, indicating its product generation within the series. The expansion slots are not equipped, so optional cards are not installed in the base unit. Its basic-drive configuration focuses on core speed control functions rather than advanced vector or positioning features.