RAC 4.1-400-460-L00-W1 Bosch Rexroth Indramat
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MPN: R911260994
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The Bosch Rexroth Indramat RAC 4.1-400-460-L00-W1 is an AC main spindle drive controller from the RAC Spindle Drive Controllers series. It has a rated connection voltage of 3 x AC 400 V at 50 Hz or 3 x AC 460 V, and delivers a rated current of 400 Amps. This device uses an internal blower for cooling and features an X4 interface terminal for optical waveguides.
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Product Description:
The RAC 4.1-400-460-L00-W1 is a spindle drive controller produced by Bosch Rexroth Indramat for the RAC Spindle Drive Controllers series. It serves as the electronic link between a CNC or PLC and a compatible induction or synchronous spindle motor, providing closed-loop speed control for machining centers and other industrial equipment. The unit regulates motor speed under changing load conditions so the spindle can maintain stable cutting performance during acceleration, steady machining, and programmed speed changes. That makes it suitable for milling, drilling, and turning processes where spindle response affects surface finish and cycle stability. By combining drive power, communication functions, and thermal management in one chassis, it supports high-speed spindle positioning and constant surface-speed cutting in demanding production lines.
Classified as an AC main spindle drive controller, the device uses a three-phase supply of 3 × AC 400 V or 460 V, with ±15% tolerance on the 400 V line to accommodate plant voltage variation. It can deliver a continuous output of 400 A, allowing it to drive large spindle motors in applications that demand sustained torque and stable speed. Heat is removed by a built-in air blower, which supports cooling inside the controller housing without requiring a separate fan assembly on the cabinet. Speed references are transmitted over the SERCOS interface, while feedback and parameter data are exchanged through the X4 optical waveguides connection to help reduce electrical noise on long cable runs.
The controller is Series 4 and Version 1. It is built without an additional bleeder, so regenerated energy must be handled by external braking hardware or by the connected drive system during deceleration. The logic board is supplied without an additional encoder input, which suits spindle systems that rely on a single primary feedback channel. This layout keeps the configuration focused on high-current spindle operation rather than optional auxiliary feedback features.
Frequently Asked Questions about RAC 4.1-400-460-L00-W1:
Q: What connection voltage does the RAC 4.1-400-460-L00-W1 spindle drive controller accept?
A: The RAC 4.1-400-460-L00-W1 supports a rated connection voltage of 3 x AC 400 V at 50 Hz (+/-15%) or 3 x AC 460 V.
Q: What is the rated current capacity of the RAC 4.1-400-460-L00-W1?
A: This model has a rated current of 400 A for main spindle control.
Q: How does the RAC 4.1-400-460-L00-W1 cool itself during operation?
A: It uses an internal blower or built-in fan for cooling to manage thermal conditions.
Q: What type of interface terminal does the RAC 4.1-400-460-L00-W1 utilize?
A: The RAC 4.1-400-460-L00-W1 features an interface terminal labeled X4 that uses optical waveguides for connections.
Q: What is the speed command interface for the RAC 4.1-400-460-L00-W1?
A: Speed commands are communicated via the SERCOS interface on this drive controller.
