Product Description:

The RAC 2.3-200-380-D0I-W1 is an AC main spindle drive controller manufactured by Bosch Rexroth Indramat for the RAC Spindle Drive Controllers series. It is used in industrial automation to provide closed-loop torque and speed regulation for machining-center spindles. The controller converts fixed-frequency mains power into a dynamically adjustable three-phase output that follows numerical control commands during acceleration, constant-speed cutting, and deceleration. That operating behavior helps the spindle maintain commanded speed as tool load changes during milling, drilling, and similar machining processes.

This controller connects to a plant supply of 3 x AC 400 V, 50-60 Hz and is rated for a continuous motor output of 200 A. Thermal management relies on an integrated built-in fan, so no cabinet ducting is required. The spindle setpoint is delivered through a 16-bit parallel digital speed command, giving high resolution for precise spindle speed adjustment over the working range. All control and sensor conductors terminate on interface X4 with 25 poles, which keeps external wiring concentrated at one connection point. Position feedback for external devices is provided by an incremental encoder output, allowing related machine functions to receive motion information without a separate feedback board.

Within the product line, the unit is Series 2 and identified as Version 3. The power module ships without an additional bleeder resistor, so regenerative energy from rapid spindle deceleration must be absorbed by external braking components. It is also supplied without an additional encoder input, so the internal incremental channel remains the only onboard feedback path. For applications with high regenerative energy, the external braking path must be handled by the surrounding system rather than by the controller itself.