Product Description:

The KDA 3.1-150-3-LYI-U1 spindle drive is produced by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. It converts DC-link energy from a shared supply into controlled three-phase power while processing spindle feedback for closed-loop regulation. This arrangement supports spindle control in automated machining equipment where stable speed and coordinated response are required during changing load conditions. By combining the power section and control functions in one housing, the unit reduces the need for separate modules and helps keep cabinet layouts compact.

The drive’s power section is rated for a continuous output of 150 A, allowing it to supply large-frame motor windings without thermal derating during normal operation. A DC bus of 300 VDC feeds the output stage, and velocity commands are transmitted through the SERCOS interface for deterministic communication between the drive and the higher-level control system. Thermal energy is removed by forced cooling, and the integrated heatsink blower moves air through the cooling fins to stabilize semiconductor temperature during sustained spindle demand. That blower is powered by an auxiliary supply of 115 V/50–60 Hz, so the airflow source remains separate from the main DC bus used by the power electronics.

Reliable operation is specified at ambient temperatures from 5 to 45 °C, and the installation altitude is limited to 1000 m above sea level so reduced air density does not interfere with cooling performance. For position-synchronized motion, the control board provides an incremental encoder output for downstream monitoring devices. It also includes a dedicated second encoder input for a spindle-mounted sensor and a phase-aligned synchronous signal. This feedback arrangement allows external monitoring hardware and synchronized machine functions to receive motion data without requiring separate signal splitters.