Product Description:

The RAC 2.3-200-380-API-W1 is an AC main spindle drive controller manufactured by Bosch Rexroth Indramat for the RAC Spindle Drive Controllers series. It regulates high-speed machine-tool spindles by converting three-phase line power into a controlled output while executing closed-loop velocity commands. Through precise current and speed regulation, the unit supports demanding cutting and drilling tasks in automated machining cells. In machine-tool service, that control helps the spindle respond smoothly as cutting load changes during acceleration and continuous operation.

It accepts a supply of 3 × AC 400 V, 50–60 Hz from typical plant mains and is rated for a continuous output of 200 A, allowing connection to large-frame spindle motors without derating. Thermal energy at this current level is removed by a built-in blower, so no external heat exchanger is required. Spindle velocity references arrive as an analog (+/- 10 V) differential signal, which the controller converts into torque-producing current with minimal latency. Control wiring, enable lines, and low-level feedback are grouped on the X4 9-pole terminal block, which keeps these connections organized inside the cabinet.

Closed-loop accuracy is enhanced by the drive's additional encoder input for spindle feedback, which supplements the installed high-resolution Indramat encoder channel. For downstream monitoring or coordinated multi-axis systems, an incremental encoder output transmits real-time position data to external devices. That signal can be used by external controllers or monitoring equipment that need spindle position information during synchronized motion. The design operates without an additional bleeder, which reduces cabinet wiring. This controller belongs to Series 2, and Version 3 identifies the hardware revision used for this unit.