Product Description:

The KDA 2.1-100-3-LYI-W1 spindle drive is manufactured by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. As a dedicated spindle power module, it converts a fixed DC bus into a controlled three-phase output so that machine-tool spindles can maintain commanded speed under changing loads. When used with velocity feedback devices, the drive supports closed-loop regulation for milling, drilling, and grinding equipment. It is suited to applications where spindle speed must remain consistent during changing mechanical demand.

Electrically, the unit draws its main energy from a DC link of 300 VDC and can deliver a continuous phase current of 100 A to the connected motor. Thermal control is handled by a mounted heat sink blower supplied from a separate 220 V/50-60 Hz AC source. This provides forced cooling and helps prevent semiconductor overheating during long duty cycles. Separate blower power allows cooling to remain available independently of the drive output stage. The drive is part of series 2, and its current loop is tuned for spindle applications that need rapid torque rise. When higher positional accuracy is required, an incremental encoder signal can be sent to downstream numerical controllers through a dedicated output.

The drive can operate in ambient temperatures from 5 to 45 °C, and installation is permitted at elevations up to 1000 m above sea level without derating. Speed commands are transmitted through the SERCOS interface, allowing synchronized coordination with other machine axes over the control network. Feedback flexibility is expanded by a second encoder input that can accept a parallel position channel or a synchronous probe trigger. This supports accurate spindle orientation during tool changes. It also supports machine sequences that require a controlled spindle stop before clamping or release.