Product Description:

The RD52.1-7N-018-L-V1-FW is a Bosch Rexroth Indramat unit in the RD 500 Drive Controllers series. Deployed in factory automation cells, the controller links a common DC bus to induction or synchronous motors and translates high-level speed or torque commands into phase-accurate current patterns. It occupies a single frame in a multi-axis cabinet and works with shared bus hardware. This arrangement reduces the need for separate rectifier stages on each axis, and it is useful where several coordinated drives are installed side by side in limited cabinet space.

Closed-loop performance is achieved with field-oriented vector control, which keeps stator and rotor flux components orthogonal for accurate torque delivery even at low speed. The power stage handles a continuous mechanical output of 18.5 kW, making it suitable for mid-range pumps, fans, and material-handling conveyors. A DC link window of 530 to 670 V allows direct connection to rectified 400 V class mains while preserving margin for regenerative surges. Energy enters the unit through a DC bus input, so several drives can operate from one rectifier in a shared-bus system. Thermal limits are managed by forced air cooling, with integrated fans drawing ambient air across the heat sink to stabilize power semiconductors. The unit is supplied without a built-in brake chopper, so external resistor modules are required when returned energy is greater than the bus capacitors can absorb.

An auxiliary input supplies 24 V standby power, keeping the control electronics and fieldbus interfaces active when the main DC bus is isolated. Keeping the control section energized in this state allows communication and status functions to remain available while the power stage is inactive. The platform is identified as design generation 1, which matches the earliest cabinet layouts and parameter structures used for this product line. It also supports option cards, mounting kits, and diagnostic tools already used across the same drive platform.