Product Description:

The KDA 3.3-050-3-LPS-U1 is a spindle drive module produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. As a dedicated spindle controller, it converts the regulated DC bus supplied by an Indramat power supply into the three-phase output needed to run high-speed machine-tool spindles, allowing coordinated speed regulation in CNC and other automation cells. This third-generation unit integrates command and feedback interfaces so the machine control can adjust rotational velocity in real time while monitoring position and load.

The drive’s power stage operates from a regulated link of 300 VDC and can deliver up to 50 A of continuous output current to the spindle motor. A built-in heat sink blower, energized by a separate 115 V/50-60 Hz source, removes switch-loss heat and helps maintain safe semiconductor temperature. Speed reference data reach the control board through the SERCOS interface, providing deterministic fiber-optic communication with the CNC. For auxiliary diagnosis or parameter loading, a serial interface (RS-232-C) is available on the front panel. The unit is assigned to series 3 of the KDA family, and its connector layout matches other Indramat 3.x spindle drives used in multi-axis cabinets.

The spindle drive operates in ambient air from 5 to 45 °C and maintains reliable performance up to 1000 m above sea level without derating. Thermal management relies on forced cooling, implemented by the attached blower and aluminum fin stack, so cabinet airflow requirements remain moderate. For motion control systems that need absolute position data, a second encoder input can accept either spindle feedback or an additional motor transducer, letting the same module supervise a tandem axis where orientation and speed must be correlated.