RAC 3.1-150-460-A00-W1-220 Bosch Rexroth Indramat
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MPN: R911237874
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The Bosch Rexroth Indramat RAC 3.1-150-460-A00-W1-220 is an AC main spindle drive controller from the RAC Spindle Drive Controllers series. It features an internal blower for cooling and handles a rated current of 150 Amps. The controller supports a rated connection voltage of 3 x AC 400 V or 3 x AC 460 V, and is operated with an analog speed command.
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Product Description:
The RAC 3.1-150-460-A00-W1-220 is manufactured by Bosch Rexroth Indramat and is part of the RAC Spindle Drive Controllers series. Classified as an AC main spindle drive controller, it is intended to regulate three-phase spindle motors in machining centers, lathes, and comparable automation equipment. The unit conditions incoming line power, interprets an analog velocity reference, and provides the current and voltage profile needed to maintain constant spindle speed under varying mechanical load. This operating role makes it suitable for spindle applications that require stable speed regulation during changing cutting conditions and shifting load demand.
Its thermal management is handled by an integrated internal blower, so enclosure layout does not require external ducting. The power stage accepts a mains supply of 3 × AC 400 V at 50 Hz within a ±15% tolerance, or 3 × AC 460 V for plants wired to North American standards. When connected to either line, it can deliver up to 150 A of continuous output to the spindle inverter. Logic and gate-drive circuits are isolated from the high-energy section and draw only AC 230 V at 50–60 Hz, which helps keep control power separate from the main supply. Closed-loop speed control uses a differential analog command of ±10 V, allowing direct linkage to most CNC cards without additional signal conditioning. This arrangement supports direct integration with machine controls that provide a standard analog spindle command.
Brake energy is managed internally, so the controller operates without an additional bleeder and frees panel space. Axis feedback wiring is simplified because it also operates without an additional encoder input, so only the primary spindle encoder is required. Service and I/O conductors terminate on connector X4, a 9-pole plug that groups enable, fault, and reference lines for straightforward disconnection when the unit is removed. Keeping these signals on one connector helps separate low-level control wiring from the main power path. The unit is identified as version 1 within series 3.
Frequently Asked Questions about RAC 3.1-150-460-A00-W1-220:
Q: How is the RAC 3.1-150-460-A00-W1-220 spindle drive controller cooled?
A: The RAC 3.1-150-460-A00-W1-220 operates with an internal blower and built-in fan for cooling.
Q: What is the rated current for the RAC 3.1-150-460-A00-W1-220 spindle drive controller?
A: This drive controller supports a rated current of 150 A for heavy-duty spindle applications.
Q: Which interface terminal does the RAC 3.1-150-460-A00-W1-220 provide for connections?
A: The primary interface terminal on this model is the X4 connector with 9 poles.
Q: What is the rated connection voltage specification of the RAC 3.1-150-460-A00-W1-220 controller?
A: The rated connection voltage for this controller is 3 x AC 400 V at 50 Hz, with a tolerance of +/-15%, or 3 x AC 460 V.
Q: What type of speed command input does the RAC 3.1-150-460-A00-W1-220 accept?
A: The speed command input for this drive is analogue with a range of +/-10 V.
