Product Description:

The RD52.1-7N-075-W-V1-FW/S122 drive controller is produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. It converts energy on a shared DC bus into controlled three-phase output for induction and synchronous motors, so motion axes in automated cells can follow commanded speed and torque profiles with minimal deviation. This arrangement is suited to industrial systems that group multiple drive units around a common power source, especially where stable motor response is needed during acceleration, deceleration, and changing load conditions.

The power section runs on a DC link that may vary from 530 to 670 V, giving the inverter margin for line fluctuations without tripping. Mechanical output is rated at 75 kW, enabling mid-sized extruders, presses, or pump drives to run from a single chassis. Heat generated by the IGBTs is extracted through liquid cooling, which reduces cabinet airflow demands and supports closely spaced installation in higher-power panels. Regulation uses field-oriented vector control, aligning stator current with rotor flux so dynamic torque follows reference commands even at low speed. The DC link is fed from an inverter DC supply, which allows several drives to share one rectifier and reduces the amount of separate mains hardware required in the cabinet.

This controller is generation 1 and is supplied without a built-in brake chopper, so regenerative energy must be routed to an external resistor or back to the line. Control electronics stay active through an auxiliary feed that accepts 24 V standby power, allowing communication and parameter retention while the main stage is de-energized. The required application code is ordered separately. This separation allows the control section to remain available during controlled stops, diagnostics, and other periods when the main power stage is not active.