Product Description:

The KDA 3.2-050-3-APD-W1 spindle drive is produced by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. Within this series, it is identified as hardware series 3 and version 2. The unit functions as a closed-loop power stage that regulates high-speed machine-tool spindles, converting intermediate DC-bus energy into a three-phase output that follows speed or position references from the CNC or motion controller. This arrangement supports spindle speed regulation and position-oriented spindle functions in automated machining systems. A mounted heat sink blower allows the drive to be installed directly in electrical cabinets used in production lines and machine centers.

The power section operates from a DC bus of 300 VDC, enabling the internal inverter to deliver a rated phase current of 50 A to the spindle motor. To remove the heat produced at this output level, the drive uses forced cooling, and its heat sink blower is supplied from an auxiliary line rated at 220 V/50–60 Hz. Continuous duty is permitted when the ambient temperature remains between 5 to 45 °C. The cabinet must maintain sufficient airflow so the cooling system can operate properly during sustained spindle demand. These electrical and cooling values set the operating range for the connected spindle system.

For motion commands, the drive interprets a digital position command and a separate speed reference carried as an analog voltage. Integration flexibility is broadened by a second encoder input, which allows simultaneous spindle feedback and auxiliary motor feedback through the same controller housing. Installation is limited to elevations up to 1000 m above sea level, because thinner air reduces cooling performance and current capacity at higher altitudes. When the unit is used with external CNC hardware, resolver modules, and cabinet ventilation equipment, these interface and installation limits must be observed.