Product Description:

The RD52.1-8N-132-R-V1-FW/S121 is a drive controller produced by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. It regulates three-phase motors in automated lines by modulating DC bus energy and applying controlled current vectors to the stator windings. That closed-loop action lets the controller serve as the axis interface between incoming power and mechanical motion in conveyors, extruders, and similar equipment. In variable-speed duties, this supports smoother starts, steady running, and controlled response to changing mechanical load.

This model uses field-oriented vector control, so torque and flux are calculated in real time to maintain steady speed during load swings. Thermal energy is removed through liquid cooling with an internal pump, and circulating coolant helps protect the power section where air cooling alone would be insufficient. The nominal output available to the connected motor is 132 kW, which suits high-power pump and fan applications. Because the DC link is sourced from an active rectifier, the unit’s supply is classified as inverter DC, which helps the drive remain stable during short mains disturbances. Power semiconductors are rated for a DC bus of up to 700 V, supporting high-power operation during sustained industrial use.

The unit is delivered without a built-in brake chopper, so external braking hardware is required when regenerated energy pushes the DC bus beyond its limit. It is identified as design generation 1, which indicates compatibility with first-generation RD 500 option cards and related parameter sets. Control electronics can remain energized with 24 V stand-by power from an external source, allowing fieldbus diagnostics and parameter access while the main DC bus is de-energized. This keeps communication available even when the power section is turned off.