Product Description:

The RAC 3.5-200-460-A0I-Z1-220 is an AC main spindle drive controller manufactured by Bosch Rexroth Indramat and supplied as part of the RAC Spindle Drive Controllers series. Intended for machine-tool spindles and other high-speed axes, the unit converts three-phase line power into regulated output that follows external speed commands and maintains torque and rotational stability during cutting, drilling, grinding, and similar processes. Integrated control electronics, power transistors, and braking circuitry let it serve as the main interface between a CNC or PLC and the spindle motor. This arrangement allows the controller to react quickly to load changes while supporting stable speed regulation across a broad operating range.

The power stage operates from 3 x AC 400 V or 3 x AC 460 V line supplies at 50 Hz with a tolerance of ±15% and furnishes up to 200 A of continuous output. Logic and gate drivers use a separate AC 230 V / 50-60 Hz feed so control functions remain active during line fluctuations. Speed is commanded through a differential Analog ±10 V input, which supports integration with external motion control hardware. The unit is an AC Main Spindle Drive Controller, and a built-in incremental encoder output forwards spindle position data to supervisory automation without extra converters. This feedback path helps higher-level controls monitor spindle motion during synchronized machine operations.

The unit uses an internal blower to move air along the heat sink and sustain rated current without external ductwork. Surplus kinetic energy is absorbed by an additional bleeder, which helps protect the DC link during rapid stops and deceleration events. The housing ships with no additional encoder input. Feedback distribution remains possible through the incremental channel on terminal X4, 9 poles. This layout supports straightforward field wiring where the standard feedback connection is sufficient for the application.