Product Description:

Bosch Rexroth Indramat manufactures the RAC 2.2-200-380-A0D-W1, an AC main spindle drive controller in the RAC Spindle Drive Controllers series. The unit regulates motor power for machine-tool spindles, allowing precise speed and torque control that integrates with numerically controlled production lines. It is suited to spindle applications where commanded speed must respond quickly to changing cutting loads while remaining stable through long machining cycles and repeated acceleration events.

The controller connects to a three-phase line of 3 x AC 400 V, 50-60 Hz and can deliver up to 200 A of output current, so it supports high-power spindles that experience rapid load changes during cutting cycles. Thermal energy from the power stage is removed by a built-in blower, eliminating the need for external cooling ducts and helping keep enclosure temperatures within operating limits. Speed reference is accepted as an analog (±10 V) signal, which allows the controller to track a proportional voltage from the CNC or PLC. For applications that require discrete position targets, a parallel bus provides a 16-bit parallel digital position setpoint, enabling the drive to receive position words directly from high-resolution motion controllers without serial conversion delay.

Field wiring for command and feedback terminates on X4, 9 poles, simplifying installation because all low-level signals occupy a single keyed plug. The drive is supplied without an additional bleeder, so dynamic braking energy must be handled by the standard internal resistor or by a separate external unit if higher dissipation is required during deceleration. It is also provided without an additional encoder input, so the main encoder channel on the spindle motor is the only feedback source. Within the product family, it is identified as Series 2 with design Version 2.