Product Description:

The RD52.1-4B-315-F-V1-FW drive controller is produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. As a three-phase AC converter module, the unit regulates large induction or synchronous motors in automated plant cells, process lines, and test stands. By adjusting output frequency and torque through closed-loop current control, the controller supports coordinated motion and improved energy use in heavy-duty production equipment. It is suited for applications that must maintain stable speed while load demand changes throughout operation.

The controller implements field-oriented vector control, so torque and flux are calculated in real time for dynamic speed regulation across the full load range. A built-in brake chopper dissipates regenerated energy into an external resistor during rapid deceleration, which helps prevent DC-link overvoltage. Thermal management is handled by forced-air cooling with integrated liquid circulation; fans move cabinet air across a liquid-cooled heat sink that transfers losses outside the enclosure. The power section is rated at 315 kW, giving it the capacity needed for high-horsepower pumps, extruders, or centrifuges. Input connections accept a line voltage from 380 to 480 V, allowing operation on common industrial mains without tap changes or transformers.

Upstream harmonic content is reduced by the integrated mains filter, which suppresses conducted emissions and improves power factor at the service entrance. Control electronics can remain active when the machine is idle because 24 V standby power may be supplied from an external source, supporting fieldbus communication and diagnostic logging during lockout. The power section draws energy from a three-phase AC supply, so all three input phases share current symmetrically and operate within the stated tolerance of ±10 % on the nominal line. The V1 code marks the controller version used for this unit.