Product Description:

The KDA 2.1-050-3-LQD-U1 spindle drive is produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. This unit converts regulated DC bus energy into three-phase output for high-speed machine tool spindles, while its design supports closed-loop torque and speed control required in industrial automation. The module fits beside Indramat supply units in multi-axis machining centers and other production cells where precise spindle positioning and repeatable surface speeds are critical to part quality. In spindle service, rapid response to changing load helps maintain commanded speed when the tool enters or leaves the material.

The power section operates from a DC bus of 300 VDC, and its output stage is rated for a continuous current of 50 A, allowing it to energize mid-frame asynchronous or synchronous spindle motors without derating. Thermal management relies on a mounted heatsink blower that is energized from a dedicated 115 V/50–60 Hz auxiliary line. This arrangement removes internal heat regardless of cabinet airflow and supports stable operation during long machining cycles. Because the cooling circuit uses forced cooling, the drive can handle sustained spindle demand without depending on passive heat dissipation alone. An independent blower supply also keeps cooling available when enclosure air movement is limited.

The drive can be positioned in ambient temperatures from 5 to 45 °C, maintaining component reliability without additional conditioning. Altitude is limited to 1000 m above sea level so dielectric gaps and heat sink capacity stay within design margins. Command data enter through the fiber-optic SERCOS interface, and fine position trimming is accepted on the separate digital position command value channel. This control arrangement supports accurate speed regulation and quick response to changing spindle commands. It also allows the higher-level control to issue repeatable setpoints for speed changes, orientation moves, and fine positioning tasks.