Product Description:

The RAC 2.3-200-460-DP0-W1 belongs to the RAC Spindle Drive Controllers series produced by Bosch Rexroth Indramat. It is an AC main spindle drive controller installed between the supply transformer and a high-speed spindle motor to regulate torque, acceleration, and deceleration during machining cycles. By converting fixed mains frequency into controlled three-phase output, the unit allows CNC systems to impose precise rotational profiles on the cutting spindle for automated metal-cutting and grinding centers. This arrangement helps the spindle hold commanded speed as cutting load changes throughout a machining program. Because the spindle is a primary motion axis, stable drive response is important for surface finish and cycle consistency.

The controller can deliver a continuous output of 200 A, so it can support large-frame spindles that draw high current during rapid starts. It accepts a rated connection of 3 × AC 400 V at 50 Hz ±15% or 460 V mains, which allows use on different plant supplies. Heat is removed by an internal blower, so airflow is maintained inside the drive during operation. The drive receives its speed reference through a 16-bit digital parallel port, allowing the CNC to send numerical speed values with fine resolution. This command method reduces dependence on analog scaling and supports repeatable speed transfer from the control. Field wiring for control, encoder supply, and signal return is grouped on the X4 25-pole terminal block, which keeps the connection points in one location.

Rotor position is measured by a high-resolution INDRAMAT encoder, and the front panel also provides an additional encoder input for spindle feedback when dual-loop control is required. This feedback arrangement supports accurate speed regulation and position monitoring during demanding spindle operation. The extra feedback connection can be used when the machine requires separate spindle monitoring. The drive is supplied without an additional bleeder, so dynamic braking energy is handled by the standard resistor network already inside the cabinet. The unit is series 2 and version 3.