Product Description:

The KDA 3.2-150-3-D0I-W1 is a spindle drive produced by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. It is in release series 3 version 2. It converts the machine controller’s speed reference into regulated three-phase power for high-speed spindles, enabling precise cutting or grinding cycles in automated machining centers and other precision machine tools.

This drive operates from a DC intermediate circuit rated at 300 VDC and can deliver a continuous output of 150 A to the spindle motor, so the inverter section must handle substantial armature current without saturation. A heatsink blower powered by an AC tap of 220 V / 50–60 Hz provides the airflow required by the unit’s forced cooling mode; without this airflow, the internal semiconductor temperature would exceed safe limits. Environmental limits allow operation between 5 to 45 °C, which is the ambient range where the thermal model maintains component reliability during normal use. Installation is permitted up to 1000 m above sea level because cooling air density and corona effects remain within the allowable range at that altitude. The speed loop accepts a digital 16-bit parallel command word, giving the CNC control fine resolution when adjusting spindle velocity. A second encoder port is not present, but an incremental encoder output mirrors the feedback so upstream controls can monitor actual speed without additional wiring.

The drive’s mounted heatsink blower places the fan directly on the aluminum extrusion, reducing ducting losses and maintaining the intended thermal resistance across the power section. Because airflow is fixed by the blower arrangement, low filter impedance helps maintain the stated cooling performance through the intake path. The digital command path pairs with the mirrored encoder stream to support external velocity-loop control, while the lack of a secondary encoder input means the system relies only on the primary feedback channel.