The Indramat RAC 2.2-200-460-A00-W1 is a high-performance, microprocessor-controlled intelligent AC spindle drive controller. Engineered by Indramat (now Bosch Rexroth), the RAC 2.2 series is designed to provide high-precision speed and position control for asynchronous main spindle motors used in heavy-duty CNC machine tools, machining centers, and printing machinery. This drive features a closed-loop system that delivers high torque even at low speeds, high-speed stability, and full power utilization throughout the wide constant power speed range.
Technical Datasheet
Product Identification
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Brand: Indramat / Bosch Rexroth
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Model Series: RAC 2.2
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Full Model Code: RAC 2.2 200-460-A00-W1
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Device Type: Intelligent AC Main Spindle Drive Controller
Electrical & Power Specifications
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Continuous Current: 200 A
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Source/Mains Voltage: 460 V AC (3-phase, 50/60 Hz input)
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Control Voltage Configuration: A (Standard factory configuration)
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Speed Command Interface: Analog or digital command interface depending on configuration cards
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Feedback Mechanism: High-resolution encoder interface for precise spindle orientation (C-axis positioning)
Cooling & Physical Properties
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Cooling Method: W1 (Internal blower/fan cooling with integrated heat sink)
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Form Factor: Heavy-duty modular drive unit for control cabinet installation
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Weight: Approximately 48.0 kg (105.8 lbs)
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Country of Origin: Germany
Application Fields
The RAC 2.2 spindle drive is widely relied upon in heavy manufacturing industries where high torque and dynamic response are required.
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CNC Machine Tools: Driving high-speed, high-torque cutting and milling operations on industrial CNC lathes.
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Automotive Manufacturing: Operating large transfer lines, automated stamping presses, and robotic engine block milling cells.
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Printing & Packaging: Managing synchronized master spindle shafts on heavy-duty, multi-station web offset printing presses.
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Aerospace Machining: Powers precision gantries for machining massive aerospace-grade aluminum and titanium structural components.
Product Instructions & Guidelines
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Handling & Unpacking: Due to the unit’s significant weight (approx. 48 kg), always use appropriate lifting hoists and mechanical aids when removing the drive from its shipping container or positioning it inside the electrical enclosure.
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Mounting Enclosure: Install the unit vertically within a dust-free, well-ventilated control cabinet. Maintain the minimum top and bottom clearances specified in the Indramat technical manual to ensure unhindered airflow through the internal cooling blower (W1 configuration).
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Parameter Configuration: The operational parameters of the RAC 2.2 are dictated by a removable programming module (personality module). Ensure that the correct module containing the matching motor parameters and system configurations is inserted into the front slot before applying logic power.
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Power and Grounding: Terminate the 3-phase 460V lines using copper conductors rated for the drive’s peak current. Ensure a low-impedance ground connection is established between the drive chassis and the main subpanel ground bus to prevent electromagnetic noise and erratic encoder signals.
Frequently Asked Questions (Q&A)
Q: Can I replace an RAC 2.2 drive without reprogramming the CNC system? A: Yes. Because the drive’s specific motor tuning and system parameters are saved directly on the plug-in firmware/programming module on the front face, you can safely transfer the existing module from the faulty drive to the replacement RAC 2.2 unit without losing your software configurations.
Q: What does the “W1” code mean at the end of the part number? A: The “W1” designation indicates that the unit utilizes an internal air-cooling system equipped with a built-in fan and venting structure, drawing air from inside the control cabinet across its heavy internal heat sink.
Q: How do I identify a fault code on the RAC 2.2 drive? A: The front panel features a diagnostic display. If a fault condition occurs, the drive will stop executing commands and output a specific alpha-numeric code (e.g., F-codes indicating overcurrent, thermal overload, or encoder signal loss). Refer to the Indramat troubleshooting guide to resolve the specific fault code shown.
Q: Is it necessary to utilize a separate external isolation transformer? A: The RAC 2.2 200-460-A00-W1 is rated directly for 460V AC inputs. However, if your plant grid experiences frequent voltage surges or deep sags, an isolation transformer or line reactor is highly recommended to protect the sensitive internal power electronics.
Related Product News
As industrial maintenance departments manage the lifecycle of robust legacy CNC machinery, the demand for component-level repair and preventative maintenance strategies for the Indramat RAC series remains exceptionally active. CNC repair networks continue to highlight issues stemming from old age, specifically focusing on aging filter capacitors and cooling fan failures inside vintage drives.
Field service bulletins recommend that facilities operating RAC 2.2 units implement routine preventative maintenance checks, specifically measuring the DC bus ripple voltage and auditing fan bearings during planned shutdowns. Addressing these component wear-outs before a hard fault occurs prevents sudden production line stoppages and avoids expensive damage to the core hybrid transistor modules inside these highly valued spindle controllers.
