RAC 2.3-250-380-LQ0-W1 Bosch Rexroth Indramat
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MPN: R911282408
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The Bosch Rexroth Indramat RAC 2.3-250-380-LQ0-W1 is an AC main spindle drive controller from the RAC Spindle Drive Controllers series. It is designed with an internal blower for cooling, operates on a rated connection voltage of 3 x AC 400 V at 50-60Hz, and provides a rated current of 250 Amps. This device features an optical waveguide interface terminal and a SERCOS speed command interface.
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Product Description:
The RAC 2.3-250-380-LQ0-W1 spindle drive controller is produced by Bosch Rexroth Indramat within the RAC Spindle Drive Controllers series. Built for high-power machining centers, the device serves as the main interface between the plant’s AC supply and the rotor of a precision spindle motor, providing closed-loop speed and torque control. It converts line voltage into a regulated three-phase output, supports rapid acceleration, and maintains constant shaft speed even when tool engagement varies. Cabinet installation near the spindle inverter minimizes cable impedance and supports electromagnetic compatibility.
The controller draws up to 250 A from a three-phase 400 V, 50–60 Hz AC supply connection and routes this energy through insulated gate transistors for vector-based current regulation. Thermal management relies on an internal blower that moves air across the heat sink, allowing full-load operation without external ducting. Motion commands arrive over the SERCOS interface, and control updates travel as real-time light pulses rather than copper signals. The front-panel communication port uses X4 optical waveguides, which provide galvanic isolation from the high-power section and simplify daisy chaining between multiple axes. This arrangement supports stable spindle dynamics and steady temperature control during prolonged metal-cutting cycles.
The unit is classified as an AC main spindle drive controller and is in Series 2 with Version 3. It is supplied without an additional bleeder, so regenerative energy is dissipated through the internal circuitry unless braking demands exceed nominal limits. Power handling, cooling, and fiber-optic communication are contained within a single enclosure, which supports compact cabinet layouts in machine tools that require high spindle torque during braking.
Frequently Asked Questions about RAC 2.3-250-380-LQ0-W1:
Q: How is the RAC 2.3-250-380-LQ0-W1 spindle drive controller cooled?
A: The RAC 2.3-250-380-LQ0-W1 is equipped with an internal blower and built-in fan for cooling.
Q: What is the rated current specification for the RAC 2.3-250-380-LQ0-W1?
A: This drive controller operates at a rated current of 250 A.
Q: What speed command interface does the RAC 2.3-250-380-LQ0-W1 utilize?
A: It uses the SERCOS interface for receiving speed command signals.
Q: What is the rated connection voltage for the RAC 2.3-250-380-LQ0-W1?
A: The rated connection voltage for this spindle drive controller is 3 x AC 400 V, 50-60 Hz.
Q: Does the RAC 2.3-250-380-LQ0-W1 come with an additional bleeder?
A: The RAC 2.3-250-380-LQ0-W1 does not include an additional bleeder.
