Product Description:

The KDA 2.1-050-3-DYS-U1 is a spindle drive manufactured by Bosch Rexroth Indramat within the KDA Spindle Drives series. As a dedicated spindle controller, it converts regulated DC power into variable-frequency output for high-speed machining heads, allowing precise acceleration, deceleration, and positioning of machine tool spindles in automated production lines. In machine tools, that allows the spindle to reach commanded speed quickly and hold it steadily during changing cut conditions. A secondary encoder input also provides synchronous position feedback for spindle orientation and rigid tapping functions.

This unit is powered from a DC bus of 300 VDC, while its heat sink blower operates on an auxiliary supply of 115 V at 50/60 Hz. Separating the power stage and blower supply reduces interaction between motor output demands and the cooling circuit. The drive can deliver a continuous motor phase current of 50 A, supporting spindle motors that require stable torque during sustained operation. Speed references are received as a 16-bit parallel digital word, which gives the controller fine command resolution for precise velocity changes. Diagnostic data and parameter changes are exchanged through an RS-232C serial interface, providing a direct link for local setup, status access, and operating data retrieval.

The drive is designed for operation in ambient temperatures from 5 to 45 °C and at altitudes up to 1000 m above sea level without derating. Thermal management is handled by a mounted heat sink blower, and cooling is provided by forced cooling to move air across the fin surfaces during prolonged high-speed cutting. This airflow helps limit hot spots in the power section when spindle loads remain high for extended periods. The drive also monitors the blower supply and encoder channels during operation so that feedback and cooling remain consistent during spindle orientation and speed control.