Product Description:

The KDA 3.1-100-3-DP0-U1 is a spindle drive produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. Designed for series 3 hardware, the unit converts fixed-voltage DC power into controlled three-phase output for high-speed machine tool spindles and other position-controlled axes. It uses a microprocessor-based regulator with real-time diagnostics to support accurate torque and speed control inside CNC cabinets. It can serve as the power stage for machining centers that require quick speed correction during tool engagement and deceleration.

The drive is supplied from a DC bus of 300 VDC and can deliver a continuous motor phase current of 100 A. To keep semiconductor temperatures stable, a dedicated heatsink blower operates from an auxiliary source rated at 115 V/50–60 Hz. The aluminum heatsink uses a mounted heatsink blower that moves air directly across the fins, and the internal airflow follows a forced cooling path to expel heat from the enclosure. This cooling arrangement helps maintain thermal stability during long spindle runs and repeated acceleration cycles. The speed command is handled through a parallel control word, and no additional fieldbus expansion interface is listed.

Operation is permitted at ambient temperatures from 5 to 45 °C and at elevations up to 1000 m above sea level without current derating. The controller interprets motion requests through a digital 16-bit parallel speed reference, which allows direct command transfer from compatible control hardware. A second encoder input is available so the drive can process spindle feedback or an auxiliary motor encoder for tighter loop response. That option supports systems that compare commanded and actual spindle behavior without adding a separate feedback module. Stable feedback processing is useful in applications where spindle speed must remain consistent during varying process conditions.