Product Description:

The KDA 3.3-100-3-L00-U1 spindle drive is produced by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. The unit operates as a power amplifier between a machine-tool controller and an AC spindle motor, delivering regulated current and velocity commands required for high-speed machining tasks across milling, turning, and grinding equipment. This setup lets the spindle respond quickly to programmed speed changes and load variations during cutting cycles. It is suited to machine tools that require stable spindle control during acceleration, steady cutting, and deceleration.

Internally, the drive is connected to a regulated DC bus rated at 300 VDC, so all power processing begins from this supply level. Its power section can deliver a continuous output of 100 A, enabling high spindle torque at low speed. Thermal management is handled through forced cooling, and the electronics are coupled to a mounted heat sink blower that expels heat directly from the rear panel. The blower is fed from an auxiliary single-phase line of 115 V at 50/60 Hz, which allows connection to standard control-power circuits. Velocity commands enter the drive over the SERCOS interface, which avoids analog drift and supports coordinated multi-axis motion. Digital command transfer also helps maintain repeatable spindle behavior when the controller coordinates motion with other machine axes. Because the design omits a second encoder input, feedback wiring remains straightforward, and the controller revision is identified as Series 3.

As part of Series 3, the drive is intended for ambient temperatures from 5 to 45 degrees Celsius; temperatures outside this range may require derating or additional cooling. Installation height must not exceed 1000 m above sea level because reduced air density lowers heat sink performance. Adequate cabinet airflow remains important when the drive is installed near other heat-producing power components.