Product Description:

The KDA 3.1-150-3-D0D-U1 is a spindle drive built by Bosch Rexroth Indramat for the KDA Spindle Drives series. In a machining center or grinding line, it delivers regulated three-phase output to a motorized spindle so the drive can maintain closed-loop speed control during cutting, drilling, or finishing operations. By combining a DC-link converter stage with onboard cooling hardware, the unit supplies torque quickly while helping protect the power electronics from thermal overload during demanding duty cycles. It is intended for machine tools that require stable spindle behavior across repeated acceleration and load changes.

The heat sink blower uses an auxiliary supply rated at 115 V/50–60 Hz, so cooling can operate without loading the DC bus. A rectified link of 300 VDC feeds the output stage and supports a continuous phase current of 150 A for high-inertia spindle applications. Internal air moves across the fins under forced cooling, and this airflow helps stabilize device temperature when ambient conditions remain between 5 to 45 °C. Mechanical installation is permitted up to 1000 m altitude; above that level, thinner air reduces heat dissipation and the drive may require derating.

The velocity loop uses a speed interface described as Digital (16-bit parallel), which transfers command data through a parallel word channel for precise spindle control. This arrangement lets the controller update spindle speed commands quickly during changing process conditions. Coarse positioning moves can also be initiated through the dedicated digital position command input, which supports functions such as spindle orient and indexed positioning. The unit does not include a second-encoder socket, so redundant feedback must be handled by the machine controller rather than by the drive itself. The product is a Series 3 variant.