Product Description:

The KDA 3.1-050-3-LQI-W1 is a spindle drive module manufactured by Bosch Rexroth Indramat and assigned to the KDA Spindle Drives series. It functions as the power and control stage between a shared DC bus and a machine-tool spindle motor. In automated machining centers, it supplies the commanded torque and speed needed for drilling, milling, or grinding operations. Its role is to convert DC-bus energy into regulated motor output so the spindle can accelerate, hold speed, and respond to command changes during cutting.

This drive draws energy from a regulated 300 VDC intermediate circuit and can deliver a continuous phase current of 50 A to the motor windings. Velocity setpoints arrive through the digital SERCOS Interface, allowing synchronous communication with CNC controllers and coordinated speed commands during machining cycles. Thermal management is handled by a dedicated heatsink blower that uses an external supply of 220 V / 50–60 Hz. The fan forces air across the aluminum fins, matching the unit’s Forced Cooling design so full output can be maintained during sustained duty cycles and repeated spindle loading. Because the airflow is directed through the heatsink, the module is suitable for cabinets with concentrated power density.

An additional diagnostics channel is provided through an incremental encoder output, enabling feedback forwarding to supervisory hardware without extra transducers. The forwarded encoder signal can be used for monitoring or downstream control functions where a duplicate motion signal is required. The drive operates in ambient conditions from 5 to 45 °C and at installation sites up to 1000 m above sea level, with rated current available across that range. Cooling hardware is integrated as a mounted heatsink blower, which keeps airflow focused on the power section instead of relying only on cabinet air. This arrangement supports stable thermal behavior during extended operation in enclosed machine cabinets.