Product Description:

The KDA 3.3-150-3-DPS-W1 spindle drive is manufactured by Bosch Rexroth Indramat within the KDA Spindle Drives series. It is intended to energize and regulate synchronous or asynchronous spindle motors used in metal-cutting centers, grinders, and similar equipment. By processing digital speed references and motor feedback, the unit supplies controlled three-phase power while its dedicated heat sink blower expels waste heat. The result is stable spindle speed, repeatable torque delivery, and reliable positioning across the full production cycle.

Its intermediate circuit requires 300 VDC from the shared supply module, and the power stage can deliver up to 150 A of continuous output current to the connected spindle winding. Thermal management relies on a mounted heatsink blower fed by an auxiliary line of 220 V 50–60 Hz, and air is driven across the fins in a forced cooling configuration to hold semiconductor junctions below their limit. Operation is specified for ambient air between 5 to 45 °C, allowing installation on shop floors without additional cabinet conditioning. Mechanical derating is unnecessary at elevations up to 1000 m, so the drive keeps its nameplate current even in facilities located near mountain foothills.

Control integration is simplified by a digital 16-bit parallel speed command port. It lets the CNC send absolute velocity words without conversion delays. For parameter uploads, diagnostics, or remote service, the front panel offers a RS-232-C link, and an additional socket accepts a second encoder input so spindle orientation or a supplementary axis encoder can be monitored directly by the drive. This arrangement keeps command and feedback handling inside the unit, which helps maintain consistent response during orientation moves, tapping cycles, and rapid spindle speed changes. It also allows the CNC to exchange operating data without separate signal conversion hardware in the control path.