Product Description:

The KDA 3.2-150-3-A0I-U1 is a spindle drive produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. As a closed-loop power stage, it regulates three-phase motor torque and speed in machining centers that require high spindle currents and rapid setpoint response. The unit receives its DC link energy from an external supply module and removes its own heat with an integrated blower. This arrangement supports continuous cabinet installation in industrial automation systems that demand stable spindle control during changing load conditions. It is suited to spindle applications where cutting conditions can change quickly and the drive must correct speed without delay.

The drive’s power section is designed around a nominal link voltage of 300 VDC, and its output stage can supply up to 150 A of continuous current to an attached spindle motor. Thermal management is handled by a mounted heat sink blower, and that fan is fed from an auxiliary line rated at 115 V, 50–60 Hz. Because the cooling circuit relies on forced cooling, cabinet airflow does not need to remove the device’s internal heat load on its own. Current feedback, tacho, and resolver signals enter through the standard KDA interface block, and a reserved port accepts a diagnostic connector. This layout keeps the control and feedback connections organized for integration with compatible spindle systems.

The permissible ambient temperature spans 5 to 45 °C, allowing full-rated operation in normal industrial conditions. Installation altitude may reach 1000 m above sea level before additional cooling measures are needed. For position synchronization with downstream motion controllers, the unit provides an incremental encoder output that mirrors actual spindle speed. Commands are supplied as an analog speed command, which the internal controller uses to modulate the IGBT bridge. A second encoder input is not fitted, so dual-loop feedback must be implemented externally when needed.