Product Description:

The KDA 2.1-050-3-DPS-U1 belongs to the KDA Spindle Drives series from Bosch Rexroth Indramat. It functions as a spindle drive, converting a fixed DC bus into a controlled three-phase output for high-speed machine tool spindles and other automated machining axes. Within an automation cell, it serves as the power stage that executes velocity commands from the numerical controller while monitoring thermal and feedback signals from the rotating assembly. This role allows the drive to support stable spindle operation during cutting, orientation, and other speed-dependent machine processes.

This model operates from a DC link of 300 VDC and can deliver a continuous output of 50 A, which is the maximum steady-state current available to the connected spindle motor. The heat sink blower that removes switching losses is fed by an auxiliary source of 115 V/50–60 Hz, so cooling can continue independently of the main power section. Speed reference data enter the drive through a 16-bit parallel digital interface, allowing fine spindle speed changes with high command resolution. Parameter transfer and diagnostics are handled through the integrated RS-232-C serial interface. A dedicated second encoder input supports spindle-synchronous feedback or an additional motor sensor, helping maintain accurate position during tool changes and spindle orientation cycles.

The cooling assembly uses a mounted heat sink blower and operates with forced cooling to move ambient air across the internal fins. This airflow helps stabilize semiconductor temperatures during rapid load changes and repeated acceleration or deceleration. Safe operation is specified between 5 to 45 °C, keeping the drive within its normal ambient range on most factory floors. Installation is permitted up to 1000 m above sea level without derating, so it can be used at typical plant elevations while maintaining reliable insulation spacing and electrical performance.