Product Description:

The KDA 3.2-150-3-APD-W1 spindle drive is produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. As a dedicated power module for high-speed machine-tool spindles, the unit converts a fixed DC bus into controlled three-phase output and supplies position and speed data to the CNC. Version 3.2 of the unit matches Indramat’s modular drive racks, allowing it to operate with main converters and diagnostic interfaces in automated machining centers. This arrangement supports coordinated spindle control in systems that require repeatable speed changes and accurate response during machining cycles.

The power stage is fed by a DC link of 300 VDC, and this fixed voltage lets the controller regulate spindle acceleration without line-frequency ripple. At continuous load, the current draw reaches 150 A, so the supply conductors and protective devices must handle substantial spindle demand. Thermal management depends on an auxiliary blower that receives 220 V at 50/60 Hz single-phase power, and the airflow moves across the rear heat sink to keep semiconductor temperatures under control. Speed demands arrive as an analog command, while fine motion blocks can be applied through a digital position command value interface. The unit also supports a second encoder socket for direct spindle or auxiliary motor feedback, which helps the control system maintain closed-loop accuracy during tapping cycles.

Cooling efficiency is improved by the drive’s mounted heat sink blower, because the integrated assembly directs air where dissipation is needed most. The unit uses forced cooling for the KDA platform, allowing full output in production rooms with ambient temperatures from 5 to 45 °C. Installation is intended for sites up to 1000 m above sea level, since lower air density at higher elevations reduces convective heat removal. Because the blower is built into the drive, the cabinet does not need a separate cooling device for this module.