Product Description:

The RD52.1-4B-055-L-F1-FW is a drive controller produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. It provides closed-loop motor regulation for industrial automation tasks such as conveyors, extruders, and general motion axes where stable speed control is needed during changing process loads. By converting plant mains power into adjustable AC output, the unit stabilizes motor speed and torque under varying mechanical loads and supports consistent operation across a broad operating range.

It accepts a three-phase AC converter feed inside an input window of 380 to 480 V, so it can connect directly to standard factory distribution networks. The power stage is rated for 55 kW, allowing it to drive medium-sized pumps, fans, or compressor systems without auxiliary power equipment. Line fluctuations are handled within a margin of ±10%, which helps reduce nuisance trips when the plant supply sags or swells during normal operation. Motion performance is based on field-oriented vector control, giving precise dynamic response to speed or torque commands even at low frequencies and during load changes. An integrated mains filter is included, so conducted emissions are reduced at the input and the installation remains easier to package in a control cabinet.

To dissipate switching heat, the housing uses forced-air cooling, a requirement that affects cabinet airflow planning and vent placement. During rapid deceleration, a built-in brake chopper redirects regenerated energy to an external resistor instead of returning voltage to the supply, which helps manage DC-bus rise during braking events. Drive diagnostics are supported by current filter feedback (U6, V6, W6), which provides cleaned phase-current signals for analysis and makes it easier to observe operating behavior during setup and troubleshooting.