Product Description:

The KDA 2.1-100-3-LY0-U1 spindle drive is manufactured by Bosch Rexroth Indramat. It is part of the KDA Spindle Drives series. As a spindle drive, it regulates the speed and torque of high-performance spindle motors used in machining centers, drilling units, and other automated equipment, translating digital motion commands into controlled three-phase output for precision metalworking and material removal tasks.

Its power electronics are supplied by a DC bus link of 300 VDC; this voltage must be present from the upstream supply module before the drive can enable torque. The current capability reaches 100 A, so the unit can furnish sizable transient and continuous spindle currents without saturation. Thermal energy produced by these currents is removed through a mounted heat sink blower that is built into the housing, and the blower is energized from an auxiliary tap rated at 115 V/50-60 Hz. Because the fan actively pulls air across the fins, the overall cooling mode is forced cooling, allowing the drive to maintain nominal ratings during prolonged cutting cycles. Command values for velocity are transmitted digitally over the SERCOS interface, which streamlines parameter exchange with the CNC controller and eliminates analog scaling errors.

For reliable operation in production halls, the drive is specified for ambient temperatures between 5 to 45 °C. Installation altitude is permitted up to 1000 m above sea level, ensuring adequate air density for the blower without additional derating. Feedback synchronization can be tightened by using the integrated second encoder input and synchronous input, so a high-resolution spindle encoder and an auxiliary position transducer can be monitored simultaneously, enabling fine speed loops and spindle-orientation functions during tool changes or tapping cycles.