RAC 4.1-300-460-API-W1 Bosch Rexroth Indramat
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MPN: R911245503
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The Bosch Rexroth Indramat RAC 4.1-300-460-API-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, with a rated current of 300 A. The controller includes a built-in fan for cooling, an additional encoder input for spindle feedback, and supports analog speed command of ±10 V.
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Product Description:
The RAC 4.1-300-460-API-W1 is an AC main spindle drive controller produced by Bosch Rexroth Indramat within the RAC Spindle Drive Controllers series. Designed as version 1 on the series 4 platform, the unit governs the rotational speed and torque of a machine-tool spindle by converting CNC commands into high-current, variable-frequency power. This allows the controller to respond quickly to load changes that occur during machining. Direct integration with Indramat spindle motors and feedback devices makes the controller the central link between the numerical control and the electromechanical load in industrial automation. It is intended for machine tools that rely on stable spindle speed during cutting and similar processes.
Electrically, the controller accepts a supply of 3 x AC 400 V, 50 Hz, ±15%, or 3 x AC 460 V, allowing operation in facilities that use either European or North American mains. From that input, it can deliver up to 300 A of armature current, giving the connected motor a wide dynamic range for acceleration and braking. Thermal energy produced by this current is removed through an internal blower, eliminating the need for external ductwork. Speed references are provided as an analog (±10 V) command, which the drive converts into a precise output frequency for closed-loop motion. Field wiring terminates at the X4 9-pole connector block, enabling quick removal during service.
The feedback channels support precise spindle control. An incremental encoder output returns real-time spindle position to the CNC, while the drive processes signals from a high-resolution Indramat encoder for internal vector regulation. For applications that require dual monitoring, there is an additional encoder input for spindle feedback, so an external measuring system can be connected without extra modules. The unit is supplied without an additional bleeder, and its internal power section dissipates standard braking energy under rated operating conditions. No separate resistor assembly is required for normal braking duty.
Frequently Asked Questions about RAC 4.1-300-460-API-W1:
Q: What input voltage does the RAC 4.1-300-460-API-W1 spindle drive controller support?
A: The RAC 4.1-300-460-API-W1 operates with 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 of the RAC 4.1-300-460-API-W1?
A: This spindle drive controller is rated for 300 A, providing high current capacity for demanding spindle applications.
Q: How is the RAC 4.1-300-460-API-W1 cooled during operation?
A: The RAC 4.1-300-460-API-W1 uses an internal blower and built-in fan for cooling.
Q: Does the RAC 4.1-300-460-API-W1 have an additional encoder input?
A: This model features an additional encoder input specifically designed for spindle feedback.
Q: What type of speed command input is supported by the RAC 4.1-300-460-API-W1?
A: Analogue speed commands of +/- 10 V can be used with this controller.
