Product Description:

The RAC 2.2-200-380-A0S-Z1 is an AC main spindle drive controller produced by Bosch Rexroth Indramat and assigned to the RAC Spindle Drive Controllers series. Designed for machine-tool spindles and other high-performance rotating loads, the unit receives line power, converts it into controlled three-phase output, and adjusts rotational speed through an analog reference. By integrating line supply rectification, field-oriented control, and fault monitoring in one assembly, it simplifies the electric axis and provides adjustable torque to synchronous or induction spindle motors. It is suited to applications where the spindle must accelerate quickly, hold commanded speed under varying load, and decelerate in a controlled manner.

The power section accepts a line supply of 3 x AC 400 V, 50–60 Hz and converts it through fully controlled IGBT bridges. Under normal duty, the current delivered to the motor terminals can reach 200 A, enabling high breakaway torque during tapping or heavy milling. Heat generated by the switching stages is removed by an internal blower, so cabinet airflow requirements stay moderate. Command input is voltage based, and the speed reference arrives as an analog ±10 V signal that the controller filters and scales into a corresponding frequency. Parameter access and diagnostics are carried over the built-in RS-232-C serial link, allowing point-to-point connection to a PC or numerical control for setup and alarm tracking. This arrangement helps keep spindle response consistent when the drive must follow changing speed commands over a wide operating range.

For dynamic deceleration, the device incorporates an additional bleeder that routes regenerated energy to a resistor bank, preventing DC-bus overvoltage when spindle inertia is high. Feedback coverage stays focused on the primary motor encoder because the unit is configured without an additional encoder input, which simplifies wiring in single-channel feedback applications. Field wiring lands on terminal strip X4 with 9 poles, giving discrete control contacts a fixed location away from the power studs. The terminal arrangement separates low-level control wiring from higher-current connections, which helps keep cabinet routing orderly. The controller is Version 2. This version keeps the feature set centered on the main spindle channel and standard serial access rather than added feedback expansion.