Product Description:

The RAC 2.3-200-380-A00-Z1 is an AC spindle drive controller produced by Bosch Rexroth Indramat and belongs to the RAC Spindle Drive Controllers series. As a main spindle drive controller, the unit receives axis commands from a CNC or motion platform and modulates power for high-speed motor spindles used in machining centers, grinders, and other metal-cutting tools. Installed in an automation cabinet, it sits between the three-phase mains and the spindle motor, providing regulated voltage and current while passing speed reference signals to maintain precise rotational velocity under changing loads. It is intended for machine tools where stable spindle speed supports repeatable cutting conditions during drilling, milling, and grinding operations.

The controller operates from a three-phase supply of 3 x AC 400 V, 50/60 Hz, which suits standard plant distribution networks. At full load, the controller can deliver 200 A, enabling it to energize large high-inertia spindle motors. Thermal energy generated by the power stage is removed by an internal blower, so no external heat exchanger is required in the cabinet. Speed setpoints arrive as an analog ±10 V signal that the control electronics scale directly into torque-producing current. This arrangement allows the drive to follow external speed commands without requiring a digital network for the reference channel. Field wiring for command and feedback is landed on connector X4 with 9 poles, keeping low-level signals on a single plug.

For dynamic braking during rapid deceleration, the unit is supplied with an additional bleeder that dissipates excess DC-link energy through an integrated resistor bank. This helps manage regenerated energy when spindle speed is reduced quickly during repeated speed changes. It is engineered without an additional encoder input, so spindle position feedback must use the primary channel provided by the control system. The unit is in series 2 and version 3.