Product Description:

The KDA 2.1-100-3-LQI-U1 belongs to the KDA Spindle Drives series produced by Bosch Rexroth Indramat. As a spindle drive, it converts regulated DC bus energy into three-phase power that controls high-speed machine tool spindles, allowing precise acceleration, braking, and speed holding during cutting or grinding cycles. Its integration into CNC systems coordinates spindle operation with other machine axes through the digital drive topology used in the system.

The power section is energized from a DC link rated at 300 VDC, so the upstream supply or converter must maintain this level for stable torque production. Under continuous load, the drive can deliver a phase current of 100 A, which sets the thermal requirements for connected cabling and the maximum spindle horsepower the unit can support. The heat sink blower is supplied from an auxiliary line of 115 V/50-60 Hz, separating cooling power from the control electronics and maintaining airflow even when the main DC link is de-energized. Heat is removed by a heat sink-mounted blower on the rear plate, and the drive uses forced cooling to keep semiconductor temperatures within safe limits during rapid speed changes or long machining cycles.

The drive operates in ambient temperatures from 5 to 45 °C, so cabinet ventilation is necessary if surrounding temperatures regularly exceed that range. Installation is permitted up to 1000 m above sea level; above this altitude, reduced air density can lower blower performance and may require derating. An additional interface provides an incremental encoder output, allowing external controllers or monitoring devices to track spindle position without extra sensors. Speed commands are received through the SERCOS interface, enabling deterministic communication and synchronized motion with other compatible drives on the network.