RAC 4.1-300-460-A0I-W1

The Bosch Rexroth Indramat RAC 4.1-300-460-A0I-W1 from the RAC Spindle Drive Controllers series is an AC Main Spindle Drive Controller engineered to deliver high-dynamic performance and precision spindle management in CNC machining centers, providing rapid acceleration, deceleration, and precise torque control at both low and high speeds. It delivers a rated current of 300 A and supports a wide rated connection voltage of 3 x AC 400 V, 50 Hz, +/-15% or 3 x AC 460 V, with tight voltage tolerance ensuring stable operation even under supply fluctuations. The drive responds to an analogue (+/- 10 V) speed command and links securely via the X4, 9 poles Interface Terminal, guaranteeing robust signal immunity in electrically noisy environments. As a Version 1 device, it integrates an incremental encoder output Additional Interface that enables high-resolution closed-loop position feedback for C-axis interpolation and automatic position control loops.

Thermal regulation within this Series 4 controller is managed by an Internal Blower / Built-in fan Cooling system capable of both internal cabinet ventilation and optional external airflow channels, optimizing heat dissipation for continuous, high-load operation. The power circuit is designed without additional bleeder, reducing component count and simplifying the power topology for enhanced reliability and reduced EMC emissions. This design also functions without additional encoder input, minimizing wiring complexity while maintaining full feedback accuracy and dynamic responsiveness. Compact, modular, and service-friendly, the controller’s architecture balances high power density with ease of panel integration and maintenance in confined machine tool enclosures.

By combining a robust 300 A capacity, flexible global voltage input range, and precise incremental encoder interface, the RAC 4.1-300-460-A0I-W1 ensures stable torque delivery and minimal speed ripple under rapid load variations. The Version 1 configuration and built-in encoder output are ideal for demanding spindle applications requiring tight tolerances, high positional repeatability, and smooth C-axis control. Bosch Rexroth Indramat’s proven Series 4 platform guarantees seamless integration into automated production lines, delivering high uptime, extended service life, and long-term operational reliability.