Product Description:

The RAC 2.1-200-380-A00-W1 is a spindle drive controller produced by Bosch Rexroth Indramat within the RAC Spindle Drive Controllers series. The unit serves as the central power stage for an AC main spindle, converting three-phase mains energy into controlled output that determines spindle speed and torque in machining centers, lathes, and grinding machines. By accepting velocity references from upstream CNC hardware, it regulates the motor field with the fast response required for precision metal-cutting automation during acceleration, deceleration, and load changes.

Its input supply is rated at 3 x AC 400 V, 50–60 Hz, so the controller can be fed from standard plant distribution in machine cabinets without an isolation transformer. Continuous motor demand is supported by a nominal drive output of 200 A, a current level suited to high-power spindles that accelerate large inertial loads quickly. Thermal energy generated by the switching components is removed by an internal blower with a built-in fan, eliminating the need for external cabinet airflow channels. The speed reference arrives as an analog (+/- 10 V) command, enabling straightforward integration with conventional CNC analog velocity cards. Field wiring lands on connector X4, 9 poles, which groups control and status signals on a single plug for straightforward connection.

The controller is shipped without an additional bleeder, so regenerative energy must be dissipated by the main DC bus or by external resistor networks already present in the system during deceleration. For applications that rely solely on motor feedback delivered through the spindle encoder, it is supplied without an additional encoder input when no separate auxiliary feedback channel is required. Classified as an AC main spindle drive controller, it implements the current and voltage loops required for vector-oriented spindle operation. The unit is Version 1.