Product Description:

The KDA 2.1-150-3-DQI-U1 spindle drive is built by Bosch Rexroth Indramat for the KDA Spindle Drives series. It regulates high-speed spindle motors by converting DC-link power into controlled three-phase output while monitoring motor feedback. The unit is Series 2 in this drive line. In an automation cell, the drive connects the spindle motor with the motion controller and manages speed changes, acceleration ramps, and braking during precision metal-cutting. This arrangement lets the control system respond quickly to changing machining demands without interrupting spindle regulation.

Its power stage is rated for a continuous output of 150 A, supporting demanding spindle operation over extended run times. The intermediate circuit runs from a 300 VDC supply, so the cabinet must include a compatible power supply and DC bus. A blower energized from a 115 V AC, 50–60 Hz auxiliary source removes heat without loading the DC link. Using a separate auxiliary source for the blower keeps cooling available without adding load to the main power section. Speed commands arrive as a digital 16-bit parallel word, which gives fine resolution for commanded spindle speed. The drive uses forced cooling to maintain a stable operating temperature during continuous duty.

The cooling hardware is a mounted heat sink blower that attaches to the cabinet wall and pushes air across the fins. Reliable operation is permitted at ambient temperatures of 5 to 45 °C, so the drive can run within normal industrial enclosure conditions without derating in that range. Installation is permitted up to 1000 m above sea level before additional cooling is needed. For signal distribution, the unit provides an incremental encoder output that passes spindle position data to external equipment. That output can support spindle monitoring, orientation functions, and coordination with surrounding machine axes.