Product Description:

The KDA 2.1-100-3-LY0-W1 is a spindle drive module manufactured by Bosch Rexroth Indramat within the KDA Spindle Drives series. It supports closed-loop speed and torque control of machine-tool spindles, receiving digital commands from a CNC control and delivering regulated three-phase power to the motor. By integrating the power section, control electronics, and a heat sink blower, the unit streamlines panel layout for automated machining centers that demand fast acceleration, consistent surface speeds, and precise spindle positioning. This arrangement suits machines that require rapid speed changes, stable cutting conditions, and accurate spindle orientation during tool changes.

Rated output current is 100 A, enabling the drive to energize large spindles without derating. The internal DC bus operates at 300 VDC, obtained from an external supply converter that also manages regenerative energy. That external converter handles returned energy during deceleration, allowing the spindle module to remain focused on motor current regulation. A dedicated blower on the heat sink draws power from an auxiliary line of 220 V at 50/60 Hz, sustaining airflow over the power semiconductors. Continuous duty is allowed within an ambient range of 5 °C to 45 °C, and installation altitude may reach 1000 m above sea level before output corrections are necessary.

Thermal management relies on a mounted heat sink blower that works in forced cooling mode, moving warm air away from the power section and helping keep IGBT temperatures stable during rapid acceleration ramps. Motion commands reach the drive over the SERCOS interface, enabling synchronized speed setpoints with other axes on the fiber-optic ring. Position feedback can be expanded through the integrated second encoder input, allowing simultaneous monitoring of the spindle and a load-side encoder. This added feedback path is useful when both motor-side and load-side motion must be monitored by the control system. The unit includes no additional interface option, so communication remains centered on the primary bus.