Product Description:

The KDA 3.1-100-3-A0S-U1 is a spindle drive built by Bosch Rexroth Indramat within the KDA Spindle Drives series. It acts as the power and control stage between a supply module and a high-speed motorized spindle, converting intermediate circuit voltage into precisely regulated three-phase output for machining centers, grinders, and milling heads. This arrangement allows the spindle to maintain stable speed and torque during changing cutting conditions, which helps support consistent machining performance across a wide operating range.

This model operates from a direct-current link of 300 VDC and is dimensioned to deliver a continuous output of 100 A. Thermal energy from the internal power semiconductors is removed by a mounted heat sink blower. The blower is supplied with 115 V/50–60 Hz mains power, and the overall assembly uses forced cooling to keep semiconductor junction temperatures within normal operating limits. Rated performance is maintained in ambient conditions from 5 °C up to 45 °C, provided the drive is installed inside a control cabinet with unobstructed airflow across the cooling fins.

An integrated RS-232 C serial interface permits parameter download, fault logging, and drive tuning from a host CNC or external terminal. Drive functions can be set through an analog speed command channel, which suits legacy control architectures that use ±10 V velocity references. The hardware supports installation heights up to 1000 m above sea level without derating, although additional cooling is recommended at higher elevations. There is no second encoder input, so closed-loop speed and position control must rely on the primary spindle encoder alone. This control layout is suitable for applications that require stable spindle regulation and straightforward electrical integration.