Product Description:

The KDA 2.1-050-3-A00-W1 spindle drive is built by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. This unit forms the link between the DC bus and a high-speed spindle motor, supplying regulated three-phase power while monitoring thermal and electrical limits. Within automated machining cells and transfer lines, the drive controls spindle speed and torque so cutting, drilling, or grinding operations follow programmed CNC profiles with repeatable accuracy. Its control loop is intended for spindle service where accurate speed regulation affects surface finish, tool life, and process consistency.

The drive’s thermal management relies on an auxiliary blower that runs from 220 V/50–60 Hz, so blower operation stays independent of DC bus variation. Internally, a bus link of 300 VDC feeds the inverter stage that generates the motor voltage. The power stage is rated for 50 A continuous output, which supports sustained spindle loading without immediate current derating. Heat produced by switching losses is extracted through a mounted heat sink blower, and the airflow method uses forced cooling because cabinet convection alone is not sufficient. This arrangement helps stabilize the temperature of the power semiconductors during long operating periods, especially when spindle demand stays high for extended machining cycles.

The permitted ambient range of 5–45 °C allows installation on shop floors that are conditioned but not fully climate-controlled. Operation above 1000 m above sea level is not supported because thinner air reduces cooling effectiveness. Speed references are accepted as an analog voltage signal, which supports connection to CNC controls that use simple command wiring rather than digital fieldbus control. This control format suits established machine platforms that already provide spindle commands through standard analog outputs. The unit has no additional interface option and no second encoder socket, so expansion slots remain unused and the connection layout stays straightforward.