Product Description:

The RAC 2.3-200-460-A0D-W1 is an AC main spindle drive controller manufactured by Bosch Rexroth Indramat and part of the RAC Spindle Drive Controllers series. It is intended for high-inertia machine-tool spindles, where the controller converts command values into regulated three-phase output for steady cutting speed, smooth acceleration, and consistent torque response. This makes it suitable for applications with frequent speed changes and high rotational inertia. The unit uses second-series electronics and hardware revision 3, so it follows familiar Indramat signaling conventions and fits multi-axis cabinets that combine spindle and feed-drive hardware.

Its power section delivers a continuous output of 200 A, allowing the unit to run large induction or synchronous spindle motors during sustained machining duty. The input stage accepts 3 x AC 400 V, 50 Hz, ±15% or 3 x AC 460 V, which suits common industrial supply systems without added voltage conversion in many installations. Thermal management relies on a built-in blower that moves air through the heat sink to control internal temperature during long operating periods. Position commands can be supplied through a 16-bit parallel digital position setpoint interface, while speed control can also be handled through an analog (±10 V) command input. This combination allows the drive to work with CNC systems that use either direct digital command transfer or conventional analog speed reference signals.

Control wiring is grouped on connector X4 with 9 poles, which keeps enable, analog, and command lines together in one connection point. The amplifier is supplied without an additional bleeder resistor, so braking energy must be handled by the internal chopper or by an external resistor matched to the spindle load. It also operates without an additional encoder input, relying on the primary spindle feedback channel used by the control system. The unit is identified as Version 3, which aligns parameter mapping with newer motion controllers and supports consistent diagnostic behavior at startup.