Product Description:

The RD52.1-4B-315-R-V1-FW is a drive controller manufactured by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. Deployed in industrial automation lines, it converts three-phase input power into controlled motor voltage and frequency so that large induction or synchronous machines follow digitally commanded torque and speed profiles. By coordinating power flow between the utility supply and the mechanical load, the unit serves as the central energy interface in high-capacity conveyors, mixers, and other process equipment.

The controller delivers a continuous output of 315 kW, giving it enough capacity for motors used on heavy production axes. It accepts grid connections from 380 to 480 V and maintains stability within a tolerance of ±10 %, allowing normal operation during moderate line swings. The unit is a Converter 3 × AC, so both rectifier and inverter stages share a common DC link, which simplifies installation and supports regenerative braking. For units rated at 132 kW and above, thermal management relies on liquid cooling with an internal pump; circulating coolant extracts heat directly from the power modules and keeps enclosure air at a lower temperature. Rapid load deceleration is handled by a built-in brake chopper, which diverts surplus DC energy to external resistors and helps prevent overvoltage trips during emergency stops.

Closed-loop torque production is executed with field-oriented vector control, enabling accurate flux alignment and fast dynamic response under shifting loads. The line filter is integrated, which suppresses conducted emissions and removes the need for separate input filters in most cabinets. The unit also furnishes 24 V standby power for its control electronics, so parameter memory and fieldbus interfaces remain active when the main power stage is shut down.