Product Description:

The RAC3.5-200-460-L00-W1-2 is an AC main spindle drive controller produced by Bosch Rexroth Indramat and assigned to the RAC Spindle Drive Controllers series. Installed between the plant power bus and a high-speed machine tool spindle, the unit modulates three-phase energy so the motor can follow CNC velocity and torque commands with minimal delay. Its chassis is intended for vertical cabinet mounting and includes a self-contained fan for internal heat removal, ensuring consistent airflow during continuous machining operations.

The controller delivers a continuous shaft power of 35 kW while drawing a steady motor current of 92 A, and it can support this load during uninterrupted production cycles. For rapid acceleration or brief cutting peaks, the unit can supply a shaft output of 55 kW, and its energy recovery circuit can return up to 27 kW to the DC link during regenerative braking. Internal electronics are energized by only 200 VA of control power, separating the low-level logic supply from the higher spindle power stage. The enclosure carries a IP10 designation, so it must be installed inside a closed electrical cabinet that shields it from dust and coolant splash. When operated at 8 kHz switching frequency, the inverter section sustains 30 kW of average shaft power without derating.

Mechanical dimensions measure 380 mm in width, 300 mm in depth, and 690 mm in height, allowing the drive to fit standard column enclosures while maintaining adequate clearance above and below the heatsink outlets. The housing weighs 49 kg, a factor to consider when planning rail strength and door hinges for service access. Operation is permitted up to 55 °C ambient at 80% relative humidity, class F, provided altitude does not exceed 1000 m. Because no additional encoder channel is provided, position feedback for the spindle must be routed through the primary resolver interface.