Product Description:

The KDA 3.1-150-3-D0I-W1 is a spindle drive produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. It converts the fixed DC link voltage from the machine’s power supply into the variable three-phase output required to run high-speed motorized spindles used in machining centers and similar automation cells. By integrating the power stage, cooling hardware, and feedback interface in one housing, the unit simplifies cabinet wiring and supports series 3 control architecture on Indramat multi-axis platforms. This arrangement allows the spindle inverter to regulate motor operation from the cabinet without separate interface modules. It is intended for coordinated motion systems that combine spindle control with other servo axes.

The power section runs on a DC bus of 300 VDC, and it can deliver a continuous output of 150 A, giving enough headroom for rapid acceleration of large spindle rotors. Thermal energy produced at that current is removed by a mounted heat sink blower, and this blower is supplied from an auxiliary line rated at 220 V / 50–60 Hz. Because the airflow is driven independently of spindle speed, the drive uses forced cooling to keep internal semiconductor temperatures within safe limits even during low-speed cutting cycles. It also supports Indramat diagnostics through SERCOS or analog controllers.

The command interface accepts a digital 16-bit parallel speed word, allowing the CNC to set spindle speed with fine resolution, while an internal processor retransmits position data through an incremental encoder output for synchronized axis coordination. The enclosure operates in ambient temperatures from 5 to 45 °C and can be installed up to 1000 m above sea level before derating is necessary. A second encoder input is not provided, so redundant feedback must be handled elsewhere in the system. These operating limits apply to the blower, sensors, and control electronics during normal machine operation.