Product Description:

The RAC 2.2-250-460-A00-Z1 spindle drive controller is produced by Bosch Rexroth Indramat and belongs to the RAC Spindle Drive Controllers series. It is an AC main spindle drive controller that regulates induction or synchronous spindle motors in machining centers and other industrial equipment. By converting fixed incoming mains power into a controlled voltage and frequency output, it lets the automation system command spindle speed and torque with precision. This type of control supports stable speed regulation during acceleration, cutting, and deceleration, especially where spindle load changes quickly during a machining cycle.

Inside the cabinet, the controller operates from a three-phase supply of 3 x AC 400 V at 50 Hz ±15% or 3 x AC 460 V. This input range allows the same unit to be used on common European and North American plant mains without a separate transformer. During operation, it can deliver a continuous output of 250 A, which provides current capacity for rapid spindle acceleration and steady cutting loads. Speed reference arrives as an analog ±10 V signal, so standard motion control hardware can send setpoints over a differential pair. Thermal losses are removed by a built-in fan, and wiring to the control section is made through the X4 nine-pole terminal block. This arrangement keeps control wiring organized inside compact cabinets. Regenerative energy from decelerating spindles is dissipated internally by an additional bleeder resistor instead of being pushed back onto the line.

The unit is supplied with no additional encoder input, so spindle feedback is expected through the primary sensing channel already present on the motor and connected to the drive bus. Feedback therefore remains limited to the primary motor sensing path used by the drive for spindle regulation. It is released in Series 2 and Version 2, which identify the product generation used for this controller. These identifiers help align the controller with the proper operating data and diagnostic behavior within the same platform. The design also supports high-energy braking cycles that occur during spindle deceleration and tool-change sequences.