RAC 2.2-250-380-A0I-Z1 Bosch Rexroth Indramat
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MPN: R911238305
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The Bosch Rexroth Indramat RAC 2.2-250-380-A0I-Z1 is part of the RAC Spindle Drive Controllers series and serves as an AC main spindle drive controller. It features a rated connection voltage of 3 x AC 400 V at 50-60Hz, a rated current of 250 Amps, and operates with internal blower cooling. The controller includes an incremental encoder output and an interface terminal with 9 poles.
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Product Description:
The Bosch Rexroth Indramat RAC 2.2-250-380-A0I-Z1 is an AC main spindle drive controller in the RAC Spindle Drive Controllers series. It is designed to regulate high-power spindle motors in CNC machines and machining centers by converting fixed-frequency mains power into a variable-frequency and variable-voltage output. This allows constant surface speed machining and controlled torque during acceleration, deceleration, and steady cutting. The controller is suited to spindle applications that require stable speed regulation during changing loads and speed transitions.
The controller connects to a three-phase supply of 3 × AC 400 V, 50–60 Hz. Its power section is rated for a continuous output of 250 A, which supports large induction or synchronous spindle motors during normal operation. Heat from the power electronics is removed by internal blower cooling, which helps maintain airflow through the cabinet-mounted unit. Spindle speed is commanded through an analog (± 10 V) reference that can be provided by a CNC or PLC axis card. Diagnostic and enable signals are routed through the X4, 9-pole terminal block for low-level control wiring.
During rapid deceleration, excess regenerative energy is directed to the integrated resistor by the additional bleeder, which helps prevent DC-bus overvoltage. The unit provides an incremental encoder output for systems that need speed monitoring or signal forwarding to other control sections. It is supplied without an additional encoder input, so the machine relies on the main spindle transducer already present in the system for closed-loop feedback. This arrangement fits installations where feedback processing is already handled elsewhere in the spindle system. The controller is built in Version 2, which identifies the platform revision used for this model.
Frequently Asked Questions about RAC 2.2-250-380-A0I-Z1:
Q: What cooling method is used by the RAC 2.2-250-380-A0I-Z1 drive controller?
A: The RAC 2.2-250-380-A0I-Z1 uses an internal blower and built-in fan for cooling.
Q: What is the rated current of the RAC 2.2-250-380-A0I-Z1?
A: This model operates with a rated current of 250 A, supporting high-powered spindle operations.
Q: What is the rated connection voltage requirement for the RAC 2.2-250-380-A0I-Z1?
A: The RAC 2.2-250-380-A0I-Z1 accepts a rated connection voltage of 3 x AC 400 V at 50-60Hz.
Q: Does the RAC 2.2-250-380-A0I-Z1 come with an additional bleeder?
A: The RAC 2.2-250-380-A0I-Z1 is equipped with an additional bleeder.
Q: What type of speed command input does the RAC 2.2-250-380-A0I-Z1 support?
A: This unit features an analogue speed command input of +/-10 V.
