Product Description:

The KDA 2.1-150-3-AYD-W1 is a drive module manufactured by Bosch Rexroth Indramat within the KDA Spindle Drives series. It operates inside closed-loop CNC systems to regulate high-speed motor spindles used for cutting, boring, and grinding. The unit belongs to the second design release of the series and is intended to form part of a modular drive rack that shares a common intermediate DC bus with other axis controllers and power supplies.

This model draws its intermediate power from a 300 VDC bus and can deliver a continuous armature current of 150 A to the connected spindle motor. Thermal energy produced by the output stage is removed through a mounted heat sink blower; the fan moves air across the fin stack in a forced cooling arrangement. The blower itself is supplied from an auxiliary line rated at 220 V/50-60 Hz, so the installation must provide a matching AC source. Position loop resolution can be improved through the second encoder input, while synchronous input pins let the drive align its commutation with an external master. An additional digital command interface accepts incremental motion targets from the CNC controller.

The drive maintains full output when ambient temperature remains between 5 to 45 degrees Celsius and when installation altitude does not exceed 1000 m above sea level; outside these ranges, the heat sink may require derating. Speed references are accepted as an analog voltage, whereas fine positioning data arrives over the separate digital position command value channel, giving the controller two distinct pathways for motion commands. When both channels are active, the internal processor prioritizes the digital trajectory data and overlays the analog speed envelope, allowing tight velocity control without sacrificing rapid point-to-point positioning accuracy.