RAC 2.1-150-460-A0I-W1-220 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat RAC 2.1-150-460-A0I-W1-220 is an AC main spindle drive controller from the RAC Spindle Drive Controllers series. It features a rated current of 150 Amps and supports a rated connection voltage of either 3-phase AC 400 V at 50 Hz or 3-phase AC 460 V. The unit includes an internal blower for cooling, an X4 interface terminal with 9 poles, and uses an analog speed command of plus or minus 10 V.
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Product Description:
The RAC 2.1-150-460-A0I-W1-220 is an AC main spindle drive controller from Bosch Rexroth Indramat in the RAC Spindle Drive Controllers series. It converts three-phase mains power into a controllable supply for high-speed spindle motors. This supports precise speed regulation during turning, milling, and grinding operations. The controller is intended for machine tools that require controlled spindle acceleration, deceleration, and steady running speed. It also integrates with the machine's existing control electronics for coordinated spindle control.
This controller connects to line power at either 3 x AC 460 V or 3 x AC 400 V, with a tolerance of ±15%, matching common North American and European plant supplies. It can deliver a continuous output of 150 A, so large spindle loads can be supported without external current boosters. That current capacity supports large spindle loads during sustained operation and demanding cutting cycles. All internal logic and protection circuits draw from a separate AC 230 V, 50–60 Hz service, which isolates low-power controls from the high-energy inverter stage. Heat produced by the switching devices is removed by an internal blower, so no external ducting is required. The unit is supplied without an additional bleeder, so dynamic braking energy is handled through the standard transistor-resistor branch in the base design.
Speed reference arrives as an analog (±10 V) signal, and real-time spindle position feedback is forwarded to CNC hardware through the dedicated incremental encoder output. This arrangement supports direct command input and position-related monitoring within the spindle control loop. Field wiring uses the X4 9-pole terminal strip, which groups enable, fault, and monitor lines for simplified control wiring. Because there is no additional encoder input, dual-feedback schemes are not supported. The product is part of Series 2 with version 1.
Frequently Asked Questions about RAC 2.1-150-460-A0I-W1-220:
Q: How is the RAC 2.1-150-460-A0I-W1-220 spindle drive controller cooled?
A: This spindle drive controller features an internal blower and built-in fan for cooling.
Q: What is the rated current capacity of the RAC 2.1-150-460-A0I-W1-220?
A: The rated current for this model is 150 A, supporting high power operation for demanding spindle applications.
Q: What are the allowable rated connection voltages for the RAC 2.1-150-460-A0I-W1-220?
A: It accepts a main connection voltage of 3 x AC 400 V at 50 Hz (±15%) or 3 x AC 460 V.
Q: What type of speed command input does the RAC 2.1-150-460-A0I-W1-220 use?
A: This controller receives its speed command via an analogue input of +/- 10 V.
Q: What type of additional interface is provided on the RAC 2.1-150-460-A0I-W1-220?
A: An incremental encoder output is available for feedback or interfacing purposes.
