Product Description:

The KDA 2.1-100-3-L00-W1 spindle drive is produced by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. Intended for machine tool and production cell spindles, the unit converts a fixed DC bus into controlled three-phase output so that high-speed induction or synchronous motors can track rapid speed commands from CNC controllers. By coordinating acceleration, braking, and steady-state torque, the drive supports precise machining cycles during drilling, milling, and similar continuous-duty processes where stable spindle speed is important. That control behavior helps the spindle hold commanded speed through load changes that occur as cutting forces rise and fall.

Internally, the drive draws power from a rectified bus at 300 VDC, and its power stage is rated for a continuous output of 100 A, giving it the current capacity needed for large spindle motors. Thermal energy is removed by a mounted heat sink blower that provides forced cooling. This blower is supplied from a dedicated 220 V/50/60 Hz line, so airflow remains independent of the DC bus and helps maintain cooling even during low-speed operation. The available current and independent cooling arrangement also reduce the chance of thermal overload during repeated accelerations.

A speed reference is received over the SERCOS interface, which removes the need for analog command wiring. There is no additional interface option, and the design also omits a second encoder input, so feedback is limited to the primary spindle encoder path. The specified operating range is 5 to 45 °C ambient and up to 1000 m above sea level, and within that range the blower keeps component temperatures within normal limits. This layout suits enclosed machine cabinets where communication simplicity and predictable thermal performance are required.