RAC 2.3-250-380-D0I-W1 Bosch Rexroth Indramat
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MPN: R911256137
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The Bosch Rexroth Indramat RAC 2.3-250-380-D0I-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 50-60Hz and offers a rated current of 250 Amps. This drive controller comes with an internal blower for cooling and an incremental encoder output, and uses a digital 16 bit parallel speed command.
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Product Description:
The RAC 2.3-250-380-D0I-W1 is an AC main spindle drive controller produced by Bosch Rexroth Indramat for the RAC Spindle Drive Controllers series. Designed to govern high-power machine tool spindles, the device converts three-phase mains power into a precisely modulated output that follows numeric control commands from the machine control system. By coordinating current, voltage, and position feedback, it helps turning, milling, and grinding centers maintain stable cutting speeds even when load conditions change during machining. It also supports rapid acceleration between setpoints and controlled spindle orientation during tool changes and other automated machine sequences.
Electrical supply requirements call for 3 x AC 400 V, 50-60 Hz, aligning the controller with standard plant mains used in industrial equipment. Under those conditions, it can source up to 250 A of output current to the spindle motor, which supports demanding acceleration, sustained cutting loads, and quick recovery after speed changes. Heat generated by the power devices is removed through an internal blower, reducing reliance on cabinet airflow and helping the controller maintain high-duty operation inside enclosed electrical cabinets. Motion setpoints are delivered through a 16-bit digital parallel speed command, giving fine resolution across the full reference range for accurate spindle speed control. Field wiring for control signals terminates on the X4 connector with 25 poles, which groups enable lines, encoder channels, and diagnostic links in one interface.
For applications that need position-feedback sharing, the unit provides an incremental encoder output that mirrors motor shaft movement for downstream CNC processors or other control components. It is supplied without an additional bleeder, so regenerative energy must be dissipated either inside the spindle motor or through an external resistor on the DC link during braking or deceleration. It is also supplied without an additional encoder input, which restricts direct connection to a secondary measuring system at the controller itself. The controller is Version 3 and belongs to series 2, so parameter settings must match that product generation.
Frequently Asked Questions about RAC 2.3-250-380-D0I-W1:
Q: How is the RAC 2.3-250-380-D0I-W1 spindle drive controller cooled?
A: This model utilizes an internal blower with a built-in fan for cooling.
Q: What is the rated connection voltage of the RAC 2.3-250-380-D0I-W1?
A: The rated connection voltage for this drive controller is 3 x AC 400 V at 50-60Hz.
Q: What is the rated current provided by the RAC 2.3-250-380-D0I-W1 spindle drive controller?
A: The drive controller delivers a rated current of 250 A for demanding applications.
Q: What type of speed command interface does the RAC 2.3-250-380-D0I-W1 offer?
A: It features a digital speed command using a 16 bit parallel interface.
Q: Does the RAC 2.3-250-380-D0I-W1 include an additional encoder input?
A: This version does not include any additional encoder input.
