Product Description:

The KDA 3.2-100-3-A0I-U1 is a spindle drive produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. It is designed to regulate three-phase induction or synchronous spindle motors by converting a fixed DC link into a variable voltage and frequency output that a CNC or PLC can use to control spindle speed and torque. By combining power electronics with dedicated feedback channels, the unit replaces separate drive and control components and supports installation on machining centers, grinding systems, and other high-speed production equipment. This arrangement lets the machine control manage spindle response and operating stability from one integrated package.

The drive operates from a regulated DC bus of 300 VDC and can deliver a continuous phase current of 100 A to the connected spindle motor. Its internal thermal design relies on a mounted heat sink blower that forces air through the power module, and the blower is supplied by an auxiliary source of 115 V, 50/60 Hz. This creates forced cooling, allowing the power semiconductors to maintain safe junction temperatures during long machining cycles. Speed reference data reach the controller as an analog signal, and differential encoder information can be retransmitted to upstream motion cards through the incremental interface.

Environmental parameters match typical shop-floor conditions. The unit is rated for continuous operation between 5 to 45 °C ambient temperature without derating and is approved for mounting at elevations up to 1000 m above sea level. Position feedback can be shared through the built-in incremental encoder output, while velocity demand enters the control board as an analog voltage for compatibility with standard CNC speed loops. The model does not include a second encoder input, so one primary feedback source is used for control and signal distribution.