Product Description:

The RS51.1-4G-024-V-NN-FW is a basic drive manufactured by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. It acts as the power stage that modulates motor voltage and frequency so induction machines can be matched to process requirements in factory automation, HVAC, or conveying cells. Using scalar voltage-to-frequency regulation, the unit provides speed control without feedback devices, making it a straightforward choice where closed-loop precision is unnecessary. Because it does not rely on motor feedback, wiring remains simpler and the drive suits variable-speed applications where adjustable output matters more than exact shaft positioning.

The drive delivers a rated output of 24 kVA, enabling it to supply medium-sized three-phase motors with stable power. It accepts line potentials within 380 to 480 V and remains functional when mains variation stays within ±10 %. Speed reference is established through U/f curve control; this proportional relationship maintains magnetizing flux as frequency changes and helps the motor produce usable torque across the speed range. An integrated mains filter attenuates conducted emissions, so additional line reactors are not required for EMC compliance in standard installations. Because the optional function slots are not equipped, the hardware footprint stays compact.

Dissipative braking energy is processed internally by a built-in brake chopper and resistor, allowing rapid deceleration without external dynamic-brake hardware. This arrangement is useful where loads must slow down more quickly than coast-to-stop operation would allow. The power section is fed from a three-phase AC converter supply, which means the unit rectifies three-phase mains and reconstructs a variable AC waveform at its output terminals. The unit is part of design generation 1, which matches it to accessories intended for the first release of the RD 500 platform.