RAC 2.3-250-460-LP0-W1 Bosch Rexroth Indramat
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MPN: R911256158
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The Bosch Rexroth Indramat RAC 2.3-250-460-LP0-W1 is an AC main spindle drive controller from the RAC Spindle Drive Controllers series. It features a rated connection voltage of 3 x AC 400 V at 50 Hz or 3 x AC 460 V, and a rated current of 250 Amps. The controller is equipped with an internal blower for cooling, a high-resolution INDRAMAT encoder, and supports SERCOS interface for speed command.
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Product Description:
The RAC 2.3-250-460-LP0-W1 is an AC main spindle drive controller manufactured by Bosch Rexroth Indramat for the RAC Spindle Drive Controllers series. As a closed-loop power module, it supplies regulated three-phase energy to high-speed machine-tool spindles and relays velocity commands from a CNC or motion platform. This supports precise speed regulation during cutting, grinding, and drilling operations in automated production cells, where stable spindle response is needed to maintain surface quality and process consistency.
This controller accepts a mains supply of 3 x AC 400 V, 50 Hz, +/-15% or 3 x AC 460 V, so it can be installed in plants that use either European or North American voltage standards. At full load, the power section delivers 250 A of continuous output current, providing enough capacity for rapid acceleration of large spindle motors and sustained operation under demanding duty cycles. Thermal management is handled by an internal blower and built-in fan, which helps keep the heat sink temperature within a safe operating range without external ducting. Speed commands are received over a SERCOS interface, allowing deterministic fiber-optic communication between the drive, the CNC, and related drive axes during synchronized machining tasks.
The control section includes an additional encoder input for spindle feedback, enabling dual-loop operation when tighter response to changing load conditions is required. Control and diagnostic signals are routed through the X4 optical-waveguide terminal, which helps reduce electromagnetic interference inside crowded cabinets. Position and speed are resolved by a high-resolution INDRAMAT encoder, allowing fine interpolation of angular position for machining processes that require minimal surface error. For braking energy, the unit is supplied without an additional bleeder, so external regenerative hardware is required when short deceleration times are needed. The drive is Version 3, and this version identifies the product revision used for this controller.
Frequently Asked Questions about RAC 2.3-250-460-LP0-W1:
Q: What is the rated current for the RAC 2.3-250-460-LP0-W1 spindle drive controller?
A: The RAC 2.3-250-460-LP0-W1 operates with a rated current of 250 A, supporting high-power spindle applications.
Q: How is the RAC 2.3-250-460-LP0-W1 spindle drive controller cooled?
A: This model features internal blower cooling with a built-in fan to maintain optimal operating temperatures.
Q: Does the RAC 2.3-250-460-LP0-W1 support additional encoder inputs for spindle feedback?
A: The controller has an additional encoder input specifically designed for spindle feedback.
Q: What is the required connection voltage for the RAC 2.3-250-460-LP0-W1?
A: It requires a rated connection voltage of 3 x AC 400 V at 50 Hz (±15%) or 3 x AC 460 V.
Q: Which interface does the RAC 2.3-250-460-LP0-W1 use for speed commands?
A: The RAC 2.3-250-460-LP0-W1 receives speed commands via a SERCOS interface for precise control.
