Product Description:

The KDA 3.1-050-3-L0I-U1 spindle drive is manufactured by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. Designed as a regenerative power module for high-speed machining spindles, it channels energy from a common DC bus into controlled three-phase output for induction or synchronous motors on CNC equipment. By combining current and velocity regulation with an integrated heat sink blower, the unit serves as the primary actuator where precise spindle speed and consistent torque are required in automated production lines.

Its electrical platform centers on a DC bus rated at 300 VDC, from which the inverter can deliver a continuous phase current of 50 A. Thermal stress is limited by a mounted heat sink blower that draws ambient air across the fin stack, and the blower is energized from an auxiliary supply of 115 V at 50/60 Hz. Because airflow is actively directed, the drive uses forced cooling, allowing full-load operation at cabinet temperatures that would derate passively cooled devices. This arrangement helps maintain stable junction temperatures when the spindle accelerates or decelerates under cyclic cutting loads and reduces the risk of thermal shutdowns during continuous machining shifts.

The drive processes speed references over the SERCOS interface, enabling deterministic motion control alongside axis drives on the same fiber-optic ring. For controllers that require tachometer feedback, an incremental encoder output is provided, while a second encoder input is omitted to simplify wiring. Continuous duty is supported between 5 to 45 degrees Celsius and up to 1000 m above sea level. Within this operating range, the supervisory logic modulates blower duty to match heat generation. These operating limits help the drive maintain stable spindle control during normal temperature changes.