Product Description:

The RAC 2.3-250-380-L00-Z1 spindle drive controller is produced by Bosch Rexroth Indramat and belongs to the RAC Spindle Drive Controllers series. This AC spindle drive controller is installed between the mains supply and an induction or synchronous motor that serves as the spindle, where it regulates torque and speed during machining cycles. By translating high-level commands from a CNC or motion controller into current-controlled outputs, the unit enables precise spindle acceleration, deceleration, and constant surface speed functions that are critical in metal cutting and forming equipment. This arrangement helps the spindle respond smoothly to changing cutting loads without losing commanded speed.

The controller is designed for a three-phase supply of 3 x AC 400 V, 50-60 Hz, and its power section can deliver a continuous line current of 250 A. Speed references arrive over the SERCOS interface, and fiber-optic links on X4 optical waveguides carry this communication while providing galvanic isolation. Heat generated by the IGBT bridge is expelled through a built-in fan, so the cabinet does not require external ducting. Deterministic cyclic data allows consistent response to changing spindle commands, and these electrical and thermal limits set the spindle power range and support selection of upstream protection devices.

For dynamic braking, the unit is supplied with an additional bleeder resistor that dissipates regenerated energy during rapid deceleration. Position feedback redundancy is not implemented because the model is specified without an additional encoder input, so primary encoder signals are expected through the SERCOS channel. Within the RAC Spindle Drive Controllers line, the drive is series 2 and version 3. These codes identify the product generation within the RAC line and distinguish this controller from other revisions with different internal configurations.