Product Description:

The KDA 2.1-100-3-A0D-U1 is a spindle drive produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. Within an automation cell, it delivers regulated three-phase power to high-speed motorized spindles and converts DC-link energy from a common rectifier into controlled torque and speed. The 2.1 designation indicates the version used for this model, and its spindle-oriented role distinguishes it from servo and axis drives used elsewhere in the same machine. This type of drive is intended for applications that require stable spindle speed during cutting, drilling, and other continuous-motion processes.

The drive operates on a DC bus of 300 VDC, and its power electronics are sized for a continuous output current of 100 A. A dedicated heat sink blower is powered from an auxiliary source of 115 V/50-60 Hz, so no separate low-voltage supply is required for fan operation. Speed reference data enter the control card as an analog signal, allowing direct connection to common velocity loops in CNC controllers, while a second channel accepts a digital position command value for precise orientation moves such as tool-change positioning. This arrangement allows the drive to support both continuous speed control and indexed spindle positioning in the same system.

A mounted heat sink blower combined with forced cooling maintains internal device temperature even when cabinet air is stagnant. The permissible ambient range is 5 to 45 °C, which matches standard shop floor climates without additional conditioning. Installation is allowed up to 1000 m above sea level. Because the second encoder input is not available, spindle feedback must be routed through the primary encoder channel, which simplifies wiring but does not support redundant monitoring. The cooling arrangement is suited to enclosed cabinets where natural airflow alone would not be enough to remove heat from the power section.