Product Description:

The RAC 2.3-200-460-APS-Z1 is an AC main spindle drive controller manufactured by Bosch Rexroth Indramat within the RAC Spindle Drive Controllers series. This unit conditions three-phase mains power and converts command signals into controlled spindle currents, allowing precision speed and torque control for machine-tool spindles and similar high-speed axes in automated production cells. By integrating closed-loop regulation and built-in cooling hardware, it serves as the power interface between numerical controls and the induction or synchronous spindle motor.

The controller accepts a three-phase supply of 3 x AC 400 V, 50 Hz, ±15%, or 3 x AC 460 V, enabling use on both European and North American distribution networks. Under nominal conditions, it can deliver a continuous output of 200 A, providing the high current margin required for rapid spindle acceleration and regenerative braking. Thermal management is handled by an internal blower, so separate cabinet airflow is not required. Speed reference arrives as a differential voltage at the analog command input, with a range of ±10 V analog, which simplifies connection to most CNC control cards. Field termination for control wiring is located on the 9-pole X4 terminal, keeping feedback, enable, and brake signals on a single connector.

Dynamic energy from rapid deceleration is routed through an additional bleeder, reducing DC bus overvoltage and protecting power semiconductors. The unit also provides an additional encoder input dedicated to spindle feedback, allowing simultaneous monitoring of motor-mounted and load-side sensors. The servo loop is optimized for a high-resolution Indramat encoder, giving fine speed increments critical for surface finish and thread-cutting routines. Within the product coding, this model is identified as Version 3, which indicates a later control revision compatible with series-2 racks while maintaining the same mounting footprint.