Product Description:

The RAC 2.2-150-380-A0S-W1 is produced by Bosch Rexroth Indramat and belongs to the RAC Spindle Drive Controllers series. It functions as an AC main spindle drive controller that regulates the rotational speed of machine-tool spindles in automated machining centers. By converting command signals from higher-level CNC systems into controlled three-phase output, it maintains precise spindle torque and velocity during cutting, drilling, or grinding cycles. That controlled output helps the spindle hold the programmed speed when the cutting load changes during operation.

This controller is designed for a mains supply of 3 x AC 400 V, 50-60 Hz, so it can be connected directly to common industrial power networks without an isolation transformer. A continuous output capability of 150 A allows the unit to drive large-frame spindle motors during rapid acceleration and sustained heavy cuts. Thermal energy from the power section is removed by a built-in blower, which moves air across heat sinks to keep semiconductor temperatures within safe limits. Spindle speed is commanded through an analog (±10 V) reference, and this voltage range provides a simple proportional signal for a CNC or PLC. For parameter setup or diagnostic exchange, an RS-232-C serial interface is available for point-to-point communication with a local computer or operator panel.

Field wiring is landed on an X4 9-pole terminal, giving a single plug-style connection for control signals and status lines. Because the unit is supplied without an additional bleeder, braking energy must be handled by the motor or an external resistor during rapid deceleration. It is also shipped without an additional encoder input, so spindle position feedback must use the primary drive interface rather than a secondary channel. The unit is an AC main spindle drive controller in series 2 and version 2, and it combines speed control, power conversion, and protective functions in one enclosure for machine-tool cabinets.