Product Description:

The KDA 3.1-050-3-AP0-W1 spindle drive is produced by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. This unit converts a DC bus supply into controlled three-phase power for high-speed machine tool spindles, allowing precise torque and speed regulation during milling, drilling, or grinding operations. In automated machining centers the drive acts as the intermediary between the CNC system and the spindle motor, interpreting analogue speed commands and delivering regulated current while managing thermal loads through its integrated blower.

Electrically, the drive draws power from a regulated DC link rated at 300 VDC and can deliver a continuous output of 50 A to the spindle motor. An internal cooling circuit is supported by a dedicated blower that plugs into a 220 V/50-60 Hz auxiliary line. The blower sits on a mounted heatsink blower assembly, and the airflow is configured for forced cooling, so heat from the IGBT stack is removed even at low spindle speeds. With an analogue speed command the unit follows the voltage reference directly, allowing smooth vector control across the operating range.

Environmental limits are moderate; the drive maintains full output in ambient temperatures from 5 to 45 °C and at sites up to 1000 m above sea level without derating. Cabinet design should reserve space for unobstructed blower intake and exhaust under those conditions. A second encoder input is available, enabling phase-locked spindle feedback or auxiliary motor position signals when the application requires synchronous tool orientation. The control card installed in version three hardware supports this feature while still accepting the analogue reference. Bosch Rexroth Indramat specifies that no additional fieldbus interface is fitted, so integration relies on hard-wired command lines and encoder connections only.