Product Description:

The KDA 2.1-100-3-D0D-W1 spindle axis drive is produced by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. It serves as the power and control interface between the CNC controller and a motorized spindle, converting DC bus energy into adjustable three-phase output so that cutting, grinding, or boring machines can match spindle speed to process requirements. The module mounts in the Indramat drive rack and shares the common DC link with adjacent axis converters inside the electrical cabinet. Its rack-mounted format suits machine tools that group spindle and feed axes on a shared power platform.

The drive operates from a stabilized link of 300 VDC and can furnish up to 100 A of motor current, supporting rapid spindle acceleration and braking. Velocity commands arrive through a 16-bit parallel speed channel, allowing the CNC to send precise reference values. An auxiliary circuit runs on 220 V/50–60 Hz, keeping the cooling devices independent of the main converter. The control board also accepts a digital position word, but it omits a second encoder socket, so feedback must be multiplexed externally. The unit is in Series 2. This control arrangement lets the spindle drive respond directly to command data from the control system without relying on an analog speed reference.

Thermal regulation is handled by a mounted heatsink blower, and the drive uses forced cooling to remove heat from the power section. Continuous operation is permitted in ambient temperatures from 5–45 °C, provided the intake filters remain clear. Installation heights up to 1000 m above sea level are permissible without derating. Proper cabinet ventilation helps maintain steady airflow through the cooling path during spindle operation. Clear intake and exhaust paths also help the blower move air effectively across the heat-generating components.