Product Description:

The Bosch Rexroth Indramat RAC 2.3-250-380-L00-W1 belongs to the RAC Spindle Drive Controllers series and serves as the power and regulation stage for primary machine-tool spindles in automated production cells. Installed between the plant mains supply and the spindle motor, it shapes current, issues speed commands, and supports coordinated motion sequences from the higher-level CNC. This arrangement allows the spindle to accelerate, decelerate, and hold commanded speed in step with programmed cutting cycles, while the controller manages the power delivered to the motor during changing load conditions. Because it sits directly in the spindle power path, it also helps translate CNC commands into stable motor behavior during startup, load changes, and programmed stops.

This model is identified as Series 2 and Version 3. The unit accepts a three-phase supply of 3 x AC 400 V, 50-60 Hz, and within that range the power section can deliver up to 250 A of continuous output to the motor windings. Velocity references arrive through the SERCOS interface, which provides deterministic timing for interpolation and override commands sent by the CNC. Feedback and diagnostic data return through the same fiber loop, while drive-ready, fault, and limit signals are handled through X4 optical waveguides, keeping motion control communication and status exchange closely coordinated. This supports synchronized spindle response during contouring and other multi-axis machining operations.

Thermal management is handled by a built-in fan, so cabinet ventilation demands remain low even at high current draw. The unit is supplied without an additional bleeder, so energy returned during spindle deceleration is dissipated by the internal resistor set sized to the rated current. The control board is supplied without an additional encoder input, so speed and position feedback are expected from the primary spindle encoder on the SERCOS ring. This layout keeps the wiring straightforward, reduces the number of added interface components in the cabinet, and uses the existing spindle feedback path for normal control and monitoring. It also keeps the control layout simpler when the machine uses the standard spindle feedback channel.