Product Description:

The KDA 3.3-100-3-A0S-W1 is a spindle drive produced by Bosch Rexroth Indramat and supplied within the KDA Spindle Drives series. As a dedicated positioning and speed regulator for high-speed machine-tool spindles, it converts regulated DC bus energy from an external supply into three-phase output for the motor while coordinating feedback with the numerical control for accurate spindle response during changing cutting loads. By integrating with compatible motors and controllers, the unit supports precise spindle acceleration, deceleration, and constant-speed machining in milling, drilling, and other automated metalworking operations.

This version 3 spindle drive relies on a blower powered from an auxiliary AC branch rated at 220 V/50–60 Hz. The blower is mounted on the housing, so the thermal design uses a mounted heat sink blower that pushes air directly across the semiconductor stack. This airflow provides forced cooling, allowing full-load operation when the internal DC link is maintained at 300 VDC. Under these conditions, the power section can deliver a continuous output of 100 A to the connected spindle motor without derating, and the separated power and control paths help keep command handling isolated from the main output stage.

The drive can be installed up to 1000 m above sea level and used continuously in ambient temperatures from 5 to 45 °C. Command input for spindle velocity is an analog signal, enabling proportional control from standard CNC outputs, while diagnostic and tuning data are exchanged through a serial interface (RS-232 C). A second encoder channel is not provided, so any dual-feedback arrangement must be handled in the machine controller. This arrangement separates speed command handling from service communication and supports straightforward integration with established control platforms.