Product Description:

The RD52.1-4B-045-L-NN-NN-T1-FW is a drive controller produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. Designed for cabinet installation, the unit processes feedback and command signals to regulate three-phase motor operation in conveyors, pumps, and production cells. It provides closed-loop speed and torque adjustment so the connected motor can respond smoothly to changing load conditions during startup, normal running, and deceleration. This makes it suitable for applications that require stable motor control during frequent speed changes or varying process demand.

The controller delivers a continuous output of 45 kW, which indicates the load it can support while staying within its thermal operating range. It is powered through a 3 x AC converter front end, so it expects a three-phase supply rather than single-phase utility service. Acceptable line voltage falls within 380 to 480 V, allowing use on common 400 V and 460 V plant systems without changes to the power stage. For precise torque regulation, the unit uses field-oriented vector control, which separates stator current into flux and torque components across the speed range. Heat generated by the IGBT bridge is removed by forced air cooling, and an internal fan moves ambient air across the heat sinks to help prevent thermal derating as enclosure temperature rises.

Protective and conditioning functions are built into the unit. A built-in brake chopper provides a low-resistance path for regenerated energy during rapid deceleration, which reduces the need for separate external switching hardware. This is useful in applications with frequent stopping or overhauling loads. The drive also includes an integrated mains filter to reduce conducted high-frequency noise before it returns to the supply line. Voltage fluctuations of ±10 % are tolerated without unnecessary trips during normal operation. The unit is classified as Design Generation 1, indicating the first hardware generation of this RD 500 platform.