Product Description:

The KDA 2.1-050-3-AQI-W1 is a spindle drive module produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. It converts analog speed references from a CNC or motion controller into regulated three-phase current for high-speed machine-tool spindles. Housed inside an automation cabinet, the unit acts as the dedicated power stage that governs acceleration, deceleration, and steady-state rotation while monitoring motor feedback. The module is intended for cabinet-mounted spindle systems that need repeatable speed control during machining cycles.

Internally, the drive is supplied from a regulated DC bus at 300 VDC, and its power electronics are rated to deliver a continuous phase current of 50 A. That current level supports spindle torque demand without triggering thermal protection during normal operation. Speed commands arrive as an analog voltage input that is interpreted in the 0–10 V or ±10 V range. Thermal management is handled by a mounted heat sink blower that forces air across the IGBT stack. This airflow provides the forced cooling needed to keep semiconductor temperatures within safe limits during full-load duty. The unit is series 2, so its mounting points and connector layout match other 2.x KDA modules.

The blower motor is powered from a dedicated 220 V/50-60 Hz source, isolating its airflow demand from the DC bus. The drive maintains full output when installed up to 1000 m above sea level and within an ambient range of 5 to 45 °C; operation outside those limits requires derating. For position-loop architectures, the additional incremental encoder output supplies real-time spindle speed feedback to the supervising controller. This feedback helps the control system compare commanded and actual spindle speed during operation. It can also support monitoring functions where stable spindle behavior is required across changing load conditions.