Product Description:

The RAC 2.2-150-460-A00-Z1 belongs to the RAC Spindle Drive Controllers series manufactured by Bosch Rexroth Indramat. As an AC main spindle drive controller, it supplies regulated power and torque commands to high-speed spindle motors used on machining centers, grinders, and other metal-cutting equipment. The unit translates motion commands from the CNC into controlled three-phase output so that the spindle maintains programmed speed and acceleration profiles during cutting cycles. This supports stable spindle speed when cutting load changes during drilling, milling, or grinding.

The controller is designed for supply grids of 3 × AC 400 V, 50 Hz, ±15 % or 3 × AC 460 V, which allows use in European or North American plants without tap changes. A continuous output capability of 150 A lets the connected spindle motor draw high startup and cutting currents without triggering protective limits. Speed references are accepted as an analog (±10 V) signal, which is a common format provided by legacy and modern CNC motion cards for closed-loop spindle control. That interface lets the drive follow commanded speed changes from the machine control without requiring a separate digital reference channel. Control and feedback lines enter through terminal X4 with 9 poles, giving a single connector point for cabinet wiring. Thermal energy from switching losses is removed by an internal blower, so external ducting or heat exchangers are not required in standard enclosures.

Energy returned during rapid deceleration is dissipated by a brake resistor supplied with an additional bleeder, which helps prevent DC-bus overvoltage when heavy rotors stop quickly. Position feedback from the spindle is handled through the primary encoder channel only because the unit is supplied without an additional encoder input, which avoids unused circuitry in single-feedback installations. This arrangement suits applications that use one primary feedback device for spindle regulation. The product is Series 2 and Version 2.