Product Description:

The RD52.1-8N-075-L-L1-FW is a three-phase AC drive controller produced by Bosch Rexroth Indramat as part of the RD 500 Drive Controllers series. This unit manages motor torque and speed in automated machinery by converting a fixed DC bus into variable output for induction or synchronous motors. By integrating regulation, protection, and diagnostics in one enclosure, the controller simplifies panel layouts and provides coordinated motion for conveyors, extruders, and other continuous-duty loads.

At the input, the controller tolerates a DC link up to 700 V, derived from a common rectifier section. This arrangement classifies the supply as Inverter DC, so the unit installs on the DC bus of multi-axis lines. Its continuous output capability is 75 kW, giving sufficient headroom for medium-sized process drives. Motor regulation is executed with field-oriented vector control, allowing precise torque production even at low shaft speeds. Internally mounted temperature-controlled fans provide forced air cooling, expelling heat across the heatsink and keeping semiconductor junctions within safe limits.

This configuration is supplied without a built-in brake chopper, so any dynamic braking energy must be handled by an external resistor module if the duty cycle includes rapid deceleration. It belongs to Design Generation 1, meaning its mechanical footprint, connector layout, and parameter set follow the first revision used throughout the RD 500 Drive Controllers series. For applications with long motor leads, the drive uses cable-damping feedback (C3, D3) to measure line impedance, allowing it to adapt its switching pattern and minimize overvoltage at the motor terminals. The required program package is not embedded at the factory, and firmware must be ordered as a separate subposition for this configuration.