Product Description:

The KDA 3.3-150-3-AP0-W1 is a spindle drive manufactured by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. Intended for machine-tool and machining-center spindles, the unit converts regulated DC bus energy into three-phase power while monitoring velocity and position through encoder feedback. By integrating drive amplification and dedicated cooling hardware, it forms the central actuator that delivers the rapid speed changes and torque levels required in automated metal-cutting and forming processes.

Electrical capacity includes a continuous output of 150 A, allowing the drive to energize high-inertia spindle motors without derating. Its DC bus connection of 300 VDC matches the standard power supply rail used in Indramat multi-axis cabinets, simplifying shared-bus installations. Thermal regulation relies on a heat sink-mounted blower that pushes air directly across the power stage, and the drive uses forced cooling to maintain semiconductor junction temperatures during sustained peak current. Speed reference comes from an analog command input, so velocity is set by a proportional ±10 V voltage. Series 3 omits optional expansion cards, leaving no additional interfaces for fieldbus or I/O extension.

The heat sink fan receives its own supply of 220 V at 50–60 Hz, isolating blower operation from the DC link and ensuring constant airflow even when the main bus is disabled. The drive can be installed in ambient conditions from 5 to 45 °C without output reduction, and altitude is limited to 1000 m above sea level to prevent dielectric stress on internal components. A second encoder input is provided so the controller can process spindle-mounted feedback or an auxiliary motor encoder, enabling synchronized orientation and high-precision position handoff within complex automation cells.