RAC 2.1-150-380-A00-W1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat RAC 2.1-150-380-A00-W1 is an AC main spindle drive controller from the RAC Spindle Drive Controllers series. It features a rated current of 150 Amps, operates at 3-phase AC 400 V and 50-60Hz, and is cooled by an internal blower. The controller includes an X4 9-pole interface terminal and uses an analog speed command.
Internal Product Review
The RAC 2.1-150-380-A00-W1 is an AC main spindle drive controller engineered for reliable spindle regulation on 3 x AC 400 V, 50-60 Hz power. A 150 A rated current and internal blower cooling support stable operation in demanding machine environments. Analog ±10 V speed command capability makes the controller a strong choice for precise spindle control.
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Product Description:
The RAC 2.1-150-380-A00-W1 is an AC main spindle drive controller from Bosch Rexroth Indramat that belongs to the RAC Spindle Drive Controllers series. It interfaces between a CNC or PLC and the motorized spindle, regulating voltage and frequency so cutting speed stays consistent throughout machining operations. By integrating control and power electronics in one housing, the unit serves as a compact axis package for demanding metalworking and woodworking equipment where precise speed following and reliable torque delivery are essential. This type of drive is commonly used where spindle load can change quickly during drilling, milling, or contouring processes.
The controller accepts input power at 3 x AC 400 V, 50–60 Hz, which aligns with common three-phase distribution panels. Its inverter section is rated for a continuous output of 150 A, enabling long roughing passes without thermal derating. Spindle speed is commanded through an analog (+/- 10 V) reference, which simplifies integration with legacy motion cards. That control method allows the drive to follow an external speed command without requiring a digital network connection. All low-level control lines land on connector X4, 9 poles, which keeps the command wiring straightforward and organized. Heat generated by the power semiconductors is removed by an internal blower that directs airflow across the heat sink and helps maintain stable operating temperature.
The unit is delivered without an additional bleeder, so braking energy must be handled by an external resistor or dissipated mechanically through the spindle. Because it lacks that internal braking aid, deceleration behavior must be matched to the machine’s load and stopping pattern. It also arrives without an additional encoder input, so closed-loop feedback comes only from the standard motor encoder supported by the base hardware. This arrangement limits auxiliary feedback options while keeping the connection layout simple. Product identification is further clarified by its assignment to Series 2 and build Version 1, which identify the product generation used for this model.
