Product Description:

The KDA 3.1-050-3-DP0-W1 spindle drive is built by Bosch Rexroth Indramat for the KDA Spindle Drives series. The module serves as the main power converter between a constant DC bus and the three-phase windings of a machine-tool spindle, issuing torque commands while monitoring encoder feedback to keep rotational error low. By integrating speed regulation with internal thermal supervision, the unit supports precision milling, drilling, and grinding tasks that require reliable closed-loop control, repeatable speed holding, and steady torque delivery within a moderate power envelope. The control structure is suited to spindle applications that need stable speed during cutting passes.

The power section operates from a nominal 300 VDC link and is rated for a continuous output of 50 A, so the DC bus and protective devices must support sustained spindle demand. A dedicated heatsink blower is supplied from an auxiliary line of 220 V/50-60 Hz, which keeps the cooling circuit separate from the control bus and allows airflow to continue independently of the DC link. The drive is specified to function in ambient temperatures from 5 to 45 °C, and installation is permitted up to 1000 m above sea level. Within that range, cabinet airflow and spacing must still support stable heat removal during continuous operation.

The thermal design relies on forced cooling through a mounted heat sink blower, so the internal IGBTs stay below junction limits during rapid spindle acceleration and deceleration. Speed commands are handled through a 16-bit digital parallel interface, which provides direct command transfer to the control stage without a fieldbus layer. A second encoder socket is available for spindle feedback or additional motor feedback, so the control loop can receive position data without external splitters. The electronics shelf is produced as Series 3 hardware and has no additional interface option, so only fieldbus-independent digital inputs are present.