RAC 2.2-250-380-AP0-W1 Bosch Rexroth Indramat
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MPN: R911239829
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The Bosch Rexroth Indramat RAC 2.2-250-380-AP0-W1 is an AC main spindle drive controller from the RAC Spindle Drive Controllers series. It features a rated current of 250 Amps, operates at a rated connection voltage of 3-phase AC 400 V at 50 to 60 Hz, and uses an internal blower for cooling. The controller comes with a high-resolution INDRAMAT encoder and an interface terminal with 9 poles.
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Product Description:
The RAC 2.2-250-380-AP0-W1 belongs to the RAC Spindle Drive Controllers series produced by Bosch Rexroth Indramat. It is an AC main spindle drive controller that regulates induction or synchronous spindle motors used in machine tools and production equipment. By converting speed commands from a CNC or PLC into controlled current and voltage patterns, the unit manages spindle torque and rotational speed for cutting, grinding, and drilling operations. Series code 2 and version 2 identify the second product generation within the RAC range, which helps place the unit within the later design stage of this controller platform.
The controller connects to a three-phase supply of 3 x AC 400 V, 50-60 Hz, a format commonly used in industrial cabinets. A continuous output capability of 250 A supports demanding spindle loads during acceleration and sustained machining duty. The speed command is accepted as an analog (+/- 10 V) signal, allowing direct interfacing with controls that provide a bipolar voltage reference. Field wiring is terminated on X4, 9 poles, which groups the relevant control connections on one plug. Thermal energy from the power section is removed by an internal blower with a built-in fan, so the controller can maintain airflow across internal components during operation.
A high-resolution INDRAMAT encoder channel supplies closed-loop feedback for applications that require accurate spindle synchronization, such as thread cutting or rigid tapping. An additional encoder input for spindle feedback allows a second feedback device to be connected when the machine arrangement calls for extra measurement capability. The unit is supplied without an additional bleeder, so regenerated energy must be handled by the shared DC bus or by an external braking resistor during fast deceleration. Classified as an AC main spindle drive controller, the unit supports stable spindle control across the commanded speed range. Its control structure is intended for machine processes that depend on repeatable speed behavior, smooth torque delivery, and reliable response to changing spindle loads.
