Product Description:

The KDA 2.1-150-3-LPD-W1 belongs to the KDA Spindle Drives series manufactured by Bosch Rexroth Indramat. It is a spindle drive designed to regulate high-speed machine-tool spindles by converting DC-link power into controlled three-phase output while exchanging speed commands with the CNC controller during machining cycles. Within an automation cell, it supplies torque and velocity control together with feedback processing so the spindle can cut, grind, or bore to programmed tolerances. This makes the unit suitable for applications that require stable spindle behavior during changing loads and repeated speed transitions.

The internal power stage is energized from a bus of 300 VDC, and it can deliver a continuous phase current of 150 A to the spindle motor. Velocity reference data reach the drive through the SERCOS interface, keeping communication synchronized with the motion bus for coordinated axis operation. A separate AC tap rated at 220 V/50-60 Hz feeds the heat sink blower, separating the cooling supply from the DC link. Heat is removed by forced cooling, allowing the controller to sustain rated output during continuous operation. The control panel also includes a second encoder socket so the axis card can accept additional spindle or auxiliary motor feedback when multi-channel machining is required.

Operation is permitted in ambient air from 5 to 45 °C, and full performance is maintained up to 1000 m above sea level without derating. A mounted heat sink blower fixed to the rear plate pushes air across the fin pack and helps prevent localized hot spots when cabinet airflow is limited. In addition to the speed loop, a separate channel for digital position command values allows the controller to accept precise indexing or step-over commands for tapping and C-axis positioning. This supports machine functions that require controlled angular movement instead of free-running spindle rotation.