Product Description:

The RAC 2.2-200-460-API-W1 is an AC main spindle drive controller produced by Bosch Rexroth Indramat for the RAC Spindle Drive Controllers series. It regulates high-power machine tool spindles by converting a three-phase supply into controlled output that follows an external velocity reference. By combining current regulation with encoder feedback, the unit helps maintain stable spindle speed during heavy cutting and rapid positioning in automated machining centers and transfer lines. That control behavior is important in machining operations where surface finish and tool loading depend on consistent rotational speed.

This controller accepts a supply of 3 × AC 400 V, 50 Hz, ±15 % or 3 × AC 460 V and can deliver up to 200 A of continuous output current to the motor windings. Thermal energy from the power stage is removed by a built-in fan, allowing cabinet installation without external ducting. Field wiring for control signals is connected through X4, 9 poles, which keeps low-level connections grouped in one place. The speed reference uses an analog ±10 V command, so a CNC or PLC can regulate spindle velocity through a standard analog interface. This arrangement allows the controller to fit into established spindle-control layouts without a separate signal converter.

Position and speed monitoring are supported through an additional encoder input for spindle feedback, while downstream equipment can receive a replicated position signal from the built-in incremental encoder output. The primary measurement device is a high-resolution INDRAMAT encoder, which gives fine velocity resolution for contouring tasks and steady feedback during changing spindle loads. It can support applications that need accurate speed observation at low and high spindle speeds. The energy dissipation circuit is built without an additional bleeder, so external brake resistors are required when the application involves frequent deceleration.