Product Description:

Bosch Rexroth Indramat builds the RAC 3.5-150-460-A0I-W1-220 as an AC main spindle drive controller for the RAC Spindle Drive Controllers series. The unit converts incoming three-phase power into regulated spindle torque and speed for machine tools and production centers. Connected to a CNC or PLC, it supports programmed cutting, drilling, and grinding cycles while the control electronics in the rack maintain the commanded velocity profile. This role makes it suitable for spindle applications that require stable speed response during changing process loads.

The power section accepts 3 x AC 400 V or 3 x AC 460 V, allowing connection to common plant power systems in Europe and North America. Under rated conditions, the current path carries 150 A, which gives the drive the capacity needed for large-frame induction or synchronous spindle motors. The control electronics are powered separately from AC 230 V, 50–60 Hz, which helps keep command and status processing stable when the main bus changes. Speed references are supplied as a ±10 V analog signal that the internal regulator converts into pulse-width-modulated output voltage. Status, fail-safe, and parameter lines terminate on the X4 9-pole interface terminal, while motor position feedback can be passed through an integrated incremental encoder output for downstream monitoring or cascaded drive arrangements.

The unit ships without an additional bleeder, so regenerative energy must be handled through the shared DC bus or by an external braking unit. It is also supplied without an additional encoder input, which omits signal-conditioning hardware that is not needed when the spindle already provides standard feedback. This arrangement fits installations that already manage braking energy at the system level and use an existing feedback path. The hardware build is series release 3, and the unit is version 5.