Product Description:

The RD52.1-4B-045-D-V1-FW is a drive controller produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. The unit converts supply power into regulated motor output for closed-loop motion axes, so it acts as the central actuator interface in automated conveyors, packaging lines, and process equipment. As part of the control stage, it manages acceleration, speed, and torque commands from higher-level PLCs, allowing the connected motor to respond smoothly during startup, load changes, and deceleration.

The controller accepts a three-phase mains connection over the adjustable range of 380 to 480 V. Within that window, it delivers a continuous mechanical output rating of 45 kW, which suits medium-power induction or synchronous motors used on pumps, extruders, and material-handling equipment. Line fluctuations are tolerated to ±10 %, reducing nuisance trips when plant voltage drifts during heavy loading. The supply topology uses a 3 x AC converter, so rectification and intermediate DC-link storage are integrated inside the housing. Energy returned during regenerative braking is dissipated by the built-in brake chopper, which avoids the need for a separate resistor module and keeps cabinet wiring straightforward.

Thermal management relies on a plug-through cooler rated for frames up to 110 kW. Mounting this heat sink through the cabinet wall channels loss heat outside the enclosure and helps protect adjacent electronics from excess temperature. Input harmonics are attenuated by an integrated mains filter, enabling compliance with plant EMC limits without separate filter components. Motor precision is supported by field-oriented vector control, which modulates current in real time to maintain constant torque at low speed and improve response under changing loads. For backup functions, the unit can draw on 24 V standby power, allowing parameter memory and fieldbus communication to stay active if the main supply is isolated.