Product Description:

The RS51.1-4G-006-L-NN-FW basic drive is manufactured by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. As a line-side converter, it interfaces three-phase industrial mains and supplies variable-frequency power to asynchronous motors used in conveyors, mixers, and positioning tables. Within an automation cell, the unit provides the voltage and frequency modulation needed for speed regulation and supports steady motor operation in applications that do not require closed-loop vector feedback. That operating principle makes it suitable for general-purpose speed control where a simple frequency-based command structure is preferred.

This controller accepts a line voltage window of 380 to 480 V and remains functional within a tolerance of ±10 %, allowing installation on industrial grids with moderate fluctuation. Its power section is rated at 6 kVA, so the drive is suited to motor loads that stay within that apparent-power range during continuous operation. The supply topology uses a 3 x AC converter, which means the rectifier and intermediate DC link are intended for symmetrical three-phase sources. Output frequency is shaped according to U/f curve control, an open-loop method that maintains a consistent volts-per-hertz relationship for predictable induction-motor performance. Because the control method is based on a fixed voltage-to-frequency ratio, it is commonly applied to fans, pumps, and similar loads with straightforward speed demands. This arrangement also supports stable starting and running behavior when the connected motor is matched correctly to the drive output.

For deceleration duty, the unit includes a built-in brake chopper and resistor, so regenerated energy can be dissipated without adding an external braking module. Thermal management relies on forced air cooling, and cabinet airflow must remain unobstructed so heat can move away from the power section. Conducted emissions are reduced by an integrated mains filter, which helps limit noise returning to the supply network. The internal braking hardware is useful on applications with repeated stopping cycles, where decelerating loads return energy to the DC link. As a design generation 1 device, it follows the early RD 500 mechanical layout and connector placement used for this product line.