RAC 4.1-300-460-A00-W1 Bosch Rexroth Indramat
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MPN: R911246837
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The Bosch Rexroth Indramat RAC 4.1-300-460-A00-W1 is an AC main spindle drive controller from the RAC Spindle Drive Controllers series. It has a rated current of 300 Amps and is designed to operate with a 3-phase AC voltage of 400 V at 50 Hz or 460 V. The unit includes an internal blower for cooling and uses an analog speed command of plus or minus 10 V.
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Product Description:
The RAC 4.1-300-460-A00-W1 is an AC main spindle drive controller produced by Bosch Rexroth Indramat and assigned to the RAC Spindle Drive Controllers series. The unit serves as the power interface between the supply mains and high-speed machine tool spindles, converting line voltage into controlled three-phase output for precise torque and speed during machining cycles. It combines current regulation, speed command processing, and protective monitoring in one enclosure, which reduces the need for separate control hardware. This arrangement supports steady spindle operation during acceleration, constant-speed cutting, and deceleration. Its control structure is suited to machine tools that require fast speed correction when cutting conditions change.
It provides a continuous output of 300 A, allowing the controller to energize large synchronous or induction spindles without thermal derating during normal operation. Thermal energy generated by this current is removed by a built-in fan, so external heat sinks are unnecessary. For mains compatibility, the power section accepts 3 × AC 400 V, 50 Hz, ±15%, or 3 × AC 460 V, allowing the same hardware to operate in European or North American plants. Speed reference data is supplied through an analog (±10 V) command, which the control loop converts into a torque-forming current setpoint. Field wiring and diagnostic access are concentrated on the 9-pole X4 connector, which helps keep cabinet layout orderly and separates this interface from the power section. The analog command input also supports control systems that use voltage-based spindle speed references.
The drive ships without an additional bleeder, so regenerated energy must be handled by the internal transistor stage or by an external resistor at the system level. It is also supplied without an additional encoder input, so primary feedback is expected from the spindle's integrated sensor through the standard interface. The controller is generation 4 with revision 1. This version is intended for spindle systems that use the standard feedback path and external energy handling when required by the application.
Frequently Asked Questions about RAC 4.1-300-460-A00-W1:
Q: How is the RAC 4.1-300-460-A00-W1 spindle drive cooled?
A: This spindle drive controller is equipped with an internal blower and built-in fan for cooling.
Q: What is the rated connection voltage of the RAC 4.1-300-460-A00-W1?
A: The rated connection voltage for this drive controller is 3 x AC 400 V at 50 Hz with a tolerance of +/-15%, or 3 x AC 460 V.
Q: What is the rated current output of the RAC 4.1-300-460-A00-W1?
A: The RAC 4.1-300-460-A00-W1 has a rated current of 300 A, enabling it to supply high-power spindle motors.
Q: What type of speed command input does the RAC 4.1-300-460-A00-W1 support?
A: This model utilizes an analogue (+/- 10 V) speed command input interface.
Q: Does the RAC 4.1-300-460-A00-W1 include an additional bleeder?
A: This drive controller does not include an additional bleeder unit.
