Product Description:

The RD52.1-5B-055-L-NN-FW is a drive controller produced by Bosch Rexroth Indramat and belongs to the RD 500 Drive Controllers series. Designed to regulate torque and speed in multi-axis automation cells, this controller works with induction or synchronous motors to convert fixed-frequency mains power into a programmable output for variable-speed operation. This operating role makes it suitable for industrial machinery that requires controlled acceleration, stable running speed, and repeatable motor response under changing load conditions.

This unit operates from a 500 V DC link when connected through a three-phase AC converter supply section, giving it the voltage headroom required for medium-power machinery. Its continuous output capability is rated at 55 kW, so it can power pumps, extruders, or large conveyor modules that require substantial mechanical output. Vector regulation is handled by field-oriented vector control, which aligns stator current with rotor flux to keep torque response linear across the speed range and improve dynamic accuracy during load changes. Heat generated by the power semiconductors is managed through forced air cooling, using a built-in fan to maintain internal component temperature during extended duty cycles.

In addition to thermal management, the hardware integrates a built-in brake chopper that diverts regenerative energy into an external resistor during deceleration, which helps prevent DC-link overvoltage. The mechanical layout corresponds to design generation 1, so cabinet mounting dimensions match other first-generation RD 500 modules. The control board is without integrated control functions, so application-specific features such as positioning or fieldbus communication require external options. The unit is supplied without firmware, and firmware must be ordered as a separate subposition.