Product Description:

The RD52.1-4B-037-L-NN-G1-NN-FW is a drive controller produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. Positioned between the mains supply and an AC motor, it converts fixed-frequency power into a regulated output that supports variable speed and torque. In automated lines, conveying systems, and process equipment, the unit governs motor behavior so that positioning, acceleration, and energy consumption stay within the limits demanded by modern industrial automation.

To match common plant distribution, the controller accepts a line voltage from 380 to 480 V, and the permissible fluctuation band is ±10%, which helps avoid nuisance trips when the grid is unstable. Its continuous output capability is 37 kW, allowing it to drive medium-frame motors used on pumps, extruders, or presses. The regulation algorithm uses field-oriented vector control, which decouples flux and torque components to maintain precise speed under load transients. Thermal management is delivered by forced air cooling, with an internal fan guiding airflow across the heat sink to keep semiconductor junctions within their thermal limits. For braking events, the power section includes a built-in brake chopper that diverts regenerated energy to an external resistor, preventing DC-bus overvoltage.

In normal service, the unit draws power through a three-phase AC converter front end, so only a balanced three-phase feed is required. An integrated mains filter attenuates conducted emissions, allowing the cabinet to meet industrial electromagnetic compatibility limits without extra hardware. As a design generation 1 device, the hardware reflects the first release of the RD52 platform. Additional functions are not equipped, so advanced application features must be handled by the supervisory PLC rather than inside the drive.