RAC 2.2-250-380-API-W1 Bosch Rexroth Indramat
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MPN: R911236986
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The Bosch Rexroth Indramat RAC 2.2-250-380-API-W1 is an AC Main Spindle Drive Controller and part of the RAC Spindle Drive Controllers series. It features a rated connection voltage of 3 x AC 400 V at 50-60Hz, supports a rated current of 250 Amps, and includes an additional encoder input for spindle feedback. The controller is equipped with a high-resolution INDRAMAT encoder and internal blower cooling.
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Product Description:
The RAC 2.2-250-380-API-W1 is an AC main spindle drive controller produced by Bosch Rexroth Indramat for the RAC Spindle Drive Controllers series. It is intended for machine-tool and production spindles, where it converts control commands from a CNC or PLC into regulated three-phase power for acceleration, speed holding, and deceleration under closed-loop control. Integrated monitoring circuits protect the power section and the connected spindle during demanding cutting, grinding, and boring processes. This makes it suitable for spindle applications that require repeatable speed regulation and controlled response to changing process loads.
The drive connects to a 3 x AC 400 V, 50–60 Hz three-phase mains supply, and its power section can deliver up to 250 A of continuous output current to the spindle motor. That current capacity supports continuous spindle duty in applications that place sustained demand on the drive and motor. The speed command is accepted as an analog (±10 V) differential reference, which the controller converts into PWM switching for the inverter bridge. Thermal losses are removed by an internal blower, so the unit can be mounted in a cabinet without external air ducting. Control and feedback wiring terminates on the front-mounted 9-pole X4 plug, which keeps the connection point clearly grouped on the front panel.
Feedback is handled through a high-resolution Indramat encoder interface that supports accurate spindle position detection at high sampling rates. The drive also provides an incremental encoder output for downstream control equipment, and an additional encoder input is available for dual-loop arrangements. With dual-loop control, the extra feedback channel can be used when the application requires separate motor and spindle measurement. The controller is Version 2, matching the product revision used for RAC diagnostics. Because the unit has no additional bleeder stage, braking energy must be absorbed by the connected motor or by an external resistor network during deceleration.
Frequently Asked Questions about RAC 2.2-250-380-API-W1:
Q: What is the rated current for the RAC 2.2-250-380-API-W1 spindle drive controller?
A: The RAC 2.2-250-380-API-W1 supports a rated current of 250 A, enabling it to drive demanding spindle motors.
Q: How is the RAC 2.2-250-380-API-W1 spindle drive controller cooled?
A: A built-in internal blower provides optimized cooling for this drive controller.
Q: Does the RAC 2.2-250-380-API-W1 feature an additional encoder input for spindle feedback?
A: This model enables spindle feedback with an additional encoder input for accurate motor control.
Q: What type of speed command input does the RAC 2.2-250-380-API-W1 accept?
A: Spindle speed is commanded using an analogue +/- 10 V signal on this unit.
Q: What is the rated connection voltage for the RAC 2.2-250-380-API-W1 drive controller?
A: The rated connection voltage for this drive controller is 3 x AC 400 V at 50-60 Hz.
