Product Description:

The RAC 2.2-250-460-D00-W1 spindle drive controller is produced by Bosch Rexroth Indramat and belongs to the RAC Spindle Drive Controllers series. Designed for CNC and general machining centers, this unit governs the torque and speed of a main spindle so that cutting processes follow programmed profiles. By combining power conversion and closed-loop regulation in one housing, it interfaces directly with the machine control to execute rapid acceleration, deceleration, and constant surface-speed routines. This layout supports applications where the spindle must respond quickly to changing load conditions during drilling, milling, and turning operations.

The drive’s thermal management is handled by a built-in internal blower, which moves air through the housing to remove heat from the power section. For mains supply, it accepts 3 x AC 400 V, 50 Hz, +/-15% or 3 x AC 460 V, giving flexibility in European and North American plants. A continuous motor output of 250 A allows the connected spindle to sustain heavy cutting loads without derating. Command values are delivered through a 16-bit parallel digital channel, permitting precise reference resolution from the numerical control. Field wiring is landed on the X4, 25-pole connector, which groups logic, enable, and monitoring signals in one plug and keeps the control interface organized.

Energy from regenerative braking is handled by the standard internal circuitry because the controller is supplied without an additional bleeder, so no external resistor is required for standard duty cycles. Position feedback is limited to the main spindle encoder because the unit ships without an additional encoder input, which suits machines that use a single measuring system. The unit is an AC main spindle drive controller for RAC generation 2 systems, and it is Version 2. This version matches the release used for the associated control and power electronics.