RAC 4.1-400-460-A00-W1 Bosch Rexroth Indramat
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MPN: R911246838
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The Bosch Rexroth Indramat RAC 4.1-400-460-A00-W1 is an AC main spindle drive controller in the RAC Spindle Drive Controllers series. It supports a rated connection voltage of 3 x AC 400 V at 50 Hz with a 15 percent tolerance or 3 x AC 460 V, and provides a rated current of 400 Amps. The controller has an internal blower for cooling and uses an analog speed command input of plus or minus 10 volts.
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Product Description:
The RAC 4.1-400-460-A00-W1 is an AC main spindle drive controller produced by Bosch Rexroth Indramat as part of the RAC Spindle Drive Controllers series. It regulates three-phase supply power for machine-tool spindles, translating incoming speed references into precise motor current while handling acceleration, constant-speed machining, and controlled deceleration. In an automation cell, the unit sits between the plant supply and the spindle motor, helping maintain stable rotational speed during cutting or grinding operations. This arrangement supports repeatable spindle behavior when the load changes during tool engagement or material removal.
The controller accepts a power input of 3 x AC 400 V, 50 Hz, ±15%, or 3 x AC 460 V, so it can be wired directly to common industrial distribution systems. Its power stage supplies a continuous output of 400 A, giving headroom for large spindle motors that demand high starting torque and steady operation under varying cutting loads. Heat generated at this current is removed by a built-in blower, eliminating the need for an external cooling loop and helping maintain internal airflow across the power section. Spindle velocity commands arrive through an analog ±10 V interface, which the controller converts into a proportional current setpoint in its inner control loop. All low-level control and status lines terminate on connector X4 with 9 poles, which keeps the related signal wiring grouped at one connection point.
The unit is built to series 4 and version 1, which identifies its product generation. The power section is delivered without an additional bleeder, so regenerated energy must be dissipated through the common DC link or by mechanical means during deceleration. Feedback expansion is omitted because the controller is supplied without an additional encoder input and relies on the spindle's primary resolver channel. This layout is suitable for spindle systems that already manage braking energy elsewhere in the machine and do not require secondary position feedback.
Frequently Asked Questions about RAC 4.1-400-460-A00-W1:
Q: What type of cooling method does the RAC 4.1-400-460-A00-W1 utilize?
A: This spindle drive controller uses an internal blower and built-in fan for cooling.
Q: What are the rated supply voltage options for the RAC 4.1-400-460-A00-W1?
A: The rated connection voltage for this unit 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 capacity of the RAC 4.1-400-460-A00-W1 spindle drive controller?
A: This model is designed for a rated current of 400 A.
Q: What type of speed command input does the RAC 4.1-400-460-A00-W1 support?
A: Speed commands are received via an analogue interface with a range of +/- 10 V.
Q: What interface terminal is equipped on the RAC 4.1-400-460-A00-W1?
A: The interface terminal provided is an X4 connector with 9 poles.
