Product Description:

The RS51.1-4G-003-D-NN-FW/S150 is a Basic Drive module manufactured by Bosch Rexroth Indramat and placed within the RD 500 Drive Controllers series. By converting fixed supply power into a regulated three-phase output, the unit enables speed and torque adjustment of standard AC machines in automated manufacturing cells, conveyors, and similar installations. Its role is to supply controlled voltage and frequency while coordinating braking energy through internal circuitry, making it a compact component for decentralized motor control.

The drive accepts a three-phase supply because it is specified as a Converter 3 x AC type. Within that topology, it tolerates line variations between 380 to 480 V, allowing use on common plant distribution levels without an external autotransformer. Output capacity is limited to 3 kVA, so the device is matched to small or medium induction motors that require moderate current. Motor flux is regulated through U/f curve control, and this open-loop method maintains a proportional relationship between voltage and frequency to help prevent saturation at low speeds. For controlled stopping and rapid deceleration events, a built-in brake chopper and resistor dissipates surplus DC-bus energy and keeps the link voltage within safe limits.

Thermal management is handled by a plug-through cooler that projects the heat sink outside the cabinet airflow, a configuration used on frames up to 110 kW and sufficient for this rating. Conducted noise to the supply is limited by an integrated mains filter, so additional line reactors are not mandatory in most installations. The power section endures supply swings within a ±10 % input tolerance, maintaining drive functionality during voltage dips. The control core belongs to design generation 1, and no optional technology functions are pre-installed.