RAC 2.3-250-380-A0I-W1 Bosch Rexroth Indramat
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MPN: R911256134
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The Bosch Rexroth Indramat RAC 2.3-250-380-A0I-W1 is an AC main spindle drive controller in the RAC Spindle Drive Controllers series. It features a rated connection voltage of 3 x AC 400 V at 50-60Hz and a rated current of 250 Amps. This controller includes an incremental encoder output and uses internal blower cooling with a built-in fan.
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Product Description:
The RAC 2.3-250-380-A0I-W1 is an AC main spindle drive controller manufactured by Bosch Rexroth Indramat as part of the RAC Spindle Drive Controllers series. Designed for large machining centers and other production equipment, it forms the closed-loop link between a CNC control and the main spindle motor, translating velocity setpoints into precisely modulated three-phase output. The device is intended for cabinet mounting, provides built-in cooling, and coordinates power conversion with feedback handling so that high-inertia spindles can accelerate, brake, and hold speed within the tolerances required for continuous multi-shift industrial automation.
The power stage is rated for 3 x AC 400 V, 50-60 Hz, allowing direct connection to standard plant mains without an intermediate transformer. At full load, the current path can deliver up to 250 A, giving sufficient headroom for cutting cycles that impose short-term torque peaks on the spindle. Control wiring is consolidated on connector X4 with 9 poles, so all logic lines are grouped on a single plug. The speed reference enters as an analog (+/-10 V) signal, which supports straightforward integration with legacy control schemes. Thermal energy is removed by an internal blower, so no external ductwork is required.
The controller retransmits spindle position through an incremental encoder output, enabling downstream axis synchronization without additional interface modules. For applications that manage braking energy through the machine's DC bus, the unit is supplied without an additional bleeder. Position monitoring based only on the primary encoder is reflected by delivery without an additional encoder input. The hardware build is identified as Version 3 and belongs to series 2. This version matches the RAC product generation used for that release.
Frequently Asked Questions about RAC 2.3-250-380-A0I-W1:
Q: How is the RAC 2.3-250-380-A0I-W1 spindle drive controller cooled?
A: The RAC 2.3-250-380-A0I-W1 spindle drive controller uses an internal blower with a built-in fan for cooling.
Q: What is the rated connection voltage for the RAC 2.3-250-380-A0I-W1 spindle drive controller?
A: The RAC 2.3-250-380-A0I-W1 has a rated connection voltage of 3 x AC 400 V at 50-60 Hz.
Q: What interface terminal does the RAC 2.3-250-380-A0I-W1 provide for users?
A: This controller features an interface terminal labeled X4 with 9 poles for connection.
Q: What is the rated current of the RAC 2.3-250-380-A0I-W1 spindle controller?
A: The rated current for the RAC 2.3-250-380-A0I-W1 is 250 A, supporting spindle motors that require high current levels.
Q: What type of speed command input is supported by the RAC 2.3-250-380-A0I-W1?
A: The RAC 2.3-250-380-A0I-W1 accepts an analogue speed command in the range of +/- 10 V.
