Product Description:

The Bosch Rexroth Indramat RAC 4.1-300-460-A0I-W1 belongs to the RAC Spindle Drive Controllers series and serves as the power and regulation unit for high-speed machine-tool spindles. By modulating three-phase line energy, the controller delivers the commanded torque and velocity profile needed for precision metal cutting and similar industrial processes. The internal control electronics coordinate with external numerical controls and feedback devices to maintain repeatable spindle performance during speed changes, load variation, and sustained cutting cycles.

The drive accepts a supply of 3 x AC 400 V, 50 Hz, ±15%, or 3 x AC 460 V, so it can connect directly to common European or North American mains. Its power section is rated for a continuous output of 300 A, enabling large-frame induction or synchronous spindle motors to accelerate rapidly under load. Thermal management is handled by a built-in fan, which provides self-contained airflow to limit semiconductor temperature rise. Spindle speed is commanded through an analog (±10 V) reference, supporting standard CNC velocity channels and straightforward retrofit integration. For cabinet-side feedback handling, the unit provides an incremental encoder output that reproduces the motor’s quadrature signals for downstream speed or position monitoring devices.

Energy recovery hardware is omitted because the unit is supplied without an additional bleeder, so regenerative power must be absorbed by the mechanical system or an external resistor bank. Feedback expansion is also omitted, and the controller comes without an additional encoder input, leaving the primary encoder channel as the only source of rotor position data. Field wiring is performed on X4 with 9 poles, which groups command and monitoring signals on a single plug. The hardware is classified as Series 4, identifying the component layout used for this generation of RAC controllers.