Product Description:

The RD52.1-7N-110-D-V1-FW/S129 is a drive controller produced by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. Designed for high-power induction and synchronous motor applications, the unit serves as the central regulation element in automated lines, conveying equipment, and machine tools where variable-speed performance is required. By converting constant DC link energy into a controlled three-phase output, the controller governs torque and speed profiles so connected machinery can follow commanded setpoints under changing load conditions. This control structure allows the drive to respond quickly to load changes in conveyors, spindles, and other process equipment.

Rated at 110 kW, the device can deliver sustained mechanical power to large motors when the DC link remains within the input range of 530 to 670 V. Its intermediate circuit is supplied from an Inverter DC source, which isolates the controller from line-side disturbances and supports common bus operation with other drives. Regulation is executed through field-oriented vector control, an algorithm that separates stator currents into torque and flux components to improve low-speed response. Thermal dissipation relies on a plug-through cooler that projects the power-module heat sink outside the enclosure so cabinet temperatures stay within limits.

For installations that do not require dynamic energy absorption, the unit is delivered without a built-in brake chopper, so regenerated voltage is not dissipated inside the controller. During deceleration, returned energy must be handled by the surrounding DC bus system or by external hardware. Control electronics remain active during power interruptions by means of 24 V standby power, supplied externally to maintain parameter memory and fieldbus communication. The hardware belongs to generation 1 and uses the option cards assigned to that platform. The operating software is ordered separately, so the base unit can be matched with the required application package.