Product Description:

The KDA 2.1-150-300-AP0-U1/115 is a spindle drive produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. Positioned inside the electrical cabinet, the module interfaces with a shared DC bus and issues controlled three-phase outputs for high-speed machining spindles. In automated milling and drilling centers, it provides the closed-loop motor regulation needed to maintain constant surface speed during tool engagement. This operating role allows the spindle to respond to changing cutting load while keeping commanded speed behavior stable during acceleration, steady cutting, and deceleration.

Input energy is drawn from the common bus at 300 VDC, and the power stage can deliver a continuous 150 A to the connected motor without exceeding its thermal limit. Heat is removed by forced cooling, where an integral blower directs airflow across the power semiconductor heat sink to keep junction temperatures stable. Full current and speed capability are maintained up to 1000 m of installation altitude, and operation above that height requires derating. Component selection and conformal coating support reliable service across an ambient range of 5 to 45 °C. The front panel includes measurement points for checking current ripple and device temperature during service.

The drive is Series 2 and uses a higher-order current regulator that improves speed tracking during load transients. As a spindle drive, it synchronizes its gate signals with resolver or encoder feedback to support smooth acceleration and precise deceleration profiles. Within the KDA Spindle Drives series, the mechanical footprint, connector layout, and cooling path are standardized. This layout helps the unit fit cabinet arrangements that already use the same bus-bar spacing, control harness routing, and ventilation path.