RAC 2.2-250-380-A00-Z1 Bosch Rexroth Indramat
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MPN: R911234781
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The Bosch Rexroth Indramat RAC 2.2-250-380-A00-Z1 is an AC main spindle drive controller from the RAC Spindle Drive Controllers series. It has a rated connection voltage of 3 x AC 400 V at 50-60Hz and a rated current of 250 Amps. This controller features internal blower cooling, a 9-pole interface terminal (X4), and supports analog speed command input.
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Product Description:
Bosch Rexroth Indramat manufactures the RAC 2.2-250-380-A00-Z1 as part of the RAC Spindle Drive Controllers series. This unit functions as an AC main spindle drive controller, supplying regulated power and speed commands to high-performance motorized spindles used in metal-cutting and other automated machining centers. By linking the spindle to the wider motion system, it converts low-level velocity references from a CNC or PLC into the high current required for rapid acceleration and accurate speed holding. This allows the spindle axis to respond quickly during speed changes while maintaining stable operation under varying cutting loads.
The controller operates from a three-phase supply of 3 x AC 400 V at line frequencies between 50 and 60 Hz and can deliver a continuous output of 250 A to the spindle motor. An internal thermal path based on an internal air blower moves air through the housing, allowing the electronics to dissipate switching and conduction losses without external cooling hardware. Speed references arrive as a differential analog signal of analog (+/- 10 V), providing the drive with proportional control over spindle speed. This differential input helps the controller respond to signed speed commands from the higher-level control. Field wiring lands on the X4 terminal block with 9 poles, which groups motor phases, protective earth, and sensor lines for straightforward cabinet integration.
Energy generated during rapid deceleration is handled by the built-in braking resistor, which is supplied with an additional bleeder to help prevent DC bus overvoltage and reduce cycle times. Position feedback options remain fixed because the unit is shipped without an additional encoder input, so applications that need only the standard spindle encoder can connect directly, while systems that require dual encoders need external signal conditioning. This arrangement suits spindle applications that use the standard feedback path and do not require a second encoder channel inside the drive. The drive is Series 2 and Version 2.
Frequently Asked Questions about RAC 2.2-250-380-A00-Z1:
Q: What cooling method is used for the RAC 2.2-250-380-A00-Z1 spindle drive controller?
A: The RAC 2.2-250-380-A00-Z1 is equipped with an internal blower for cooling, utilizing a built-in fan for thermal regulation.
Q: Does the RAC 2.2-250-380-A00-Z1 include an additional bleeder?
A: This spindle drive controller features an additional bleeder as part of its configuration.
Q: What is the rated connection voltage for the RAC 2.2-250-380-A00-Z1?
A: The rated connection voltage for this model is 3 x AC 400 V at 50-60Hz, ensuring compatibility with standard three-phase power supplies.
Q: What type of speed command input does the RAC 2.2-250-380-A00-Z1 support?
A: The RAC 2.2-250-380-A00-Z1 accepts an analogue speed command input of +/- 10 V.
Q: What is the rated current capacity of the RAC 2.2-250-380-A00-Z1?
A: This drive controller handles a rated current of 250 A, suitable for high-power spindle applications.
