Product Description:

The RAC 3.5-150-460-D00-W1-220 is an AC main spindle drive controller produced by Bosch Rexroth Indramat for the RAC Spindle Drive Controllers series. It governs spindle motors used in machine tools, converting numerical control commands into precise torque and speed so cutting heads follow programmed paths accurately. By integrating the power stage, logic supply, and communication features in one housing, the unit streamlines spindle control within automated machining centers and transfer lines. This arrangement lets the spindle respond quickly to commanded speed changes during milling, drilling, and other continuous machining tasks.

This controller accepts a mains supply of 3 x AC 400 V or 3 x AC 460 V at 50 Hz, accommodating a ±15% variation common in plant networks. Control electronics are energized separately from an AC 230 V / 50-60 Hz feed, which helps keep low-voltage logic stable when the power section is under changing load. The inverter can deliver up to 150 A of continuous output current, giving high-inertia spindles the current needed for acceleration and sustained cutting duty. Thermal energy from switching losses is removed by an internal blower, so no external ducting is required. Speed references arrive as a 16-bit digital parallel command, allowing fine resolution for applications that require accurate spindle speed control and consistent surface finish.

All low-level signals route through the 25-pole X4 interface, which groups feedback, enable, and diagnostic connections on one plug. This arrangement keeps signal wiring concentrated at a single connection point in the cabinet. The power section is supplied without an additional bleeder, so applications with frequent deceleration may require external braking components to absorb regenerated energy. Redundant sensing is also omitted because the unit is supplied without an additional encoder input and relies on the primary feedback channel for speed and position data. The drive is Series 3 and Version 5.