Product Description:

The KDA 1.1-050-300-W1-220 is a DC-fed spindle drive module produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. It interfaces with CNC controllers to convert a stabilized DC bus into three-phase output that governs speed and torque on high-speed machine-tool spindles. This arrangement lets the controller command acceleration, steady running, and deceleration without a separate external regulator for each loop. By handling closed-loop current regulation and fault monitoring inside a compact rack assembly, the drive reduces panel wiring while helping the connected motor follow programmed profiles during drilling, milling, or grinding cycles. Because spindle applications often require rapid speed changes, the control section reacts quickly to command changes and operating faults.

The power stage is rated for continuous output of 50 A, allowing it to energize medium-power spindle motors during normal duty cycles. It operates from a regulated bus of 300 VDC, so it is typically paired with a supply or regeneration unit that maintains this link voltage. Thermal management relies on forced cooling, and a separate blower pushes air across the heat sink to prevent semiconductor derating under sustained load. The permitted ambient temperature range is 5 to 45 °C, which suits enclosed machine cabinets with controlled airflow. Installation is permitted up to 1000 m above sea level, where the cooling path can still move enough air through the ducted channel.

The unit is classified as a Spindle Drive and is Series 1 with Series Version 1. Internally, the reinforced DC link capacitors smooth bus ripple so the current loops remain stable during rapid speed changes and regenerative braking. Smoother bus voltage helps reduce torque variation at the motor during changing spindle loads. The series and version codes identify the early KDA generation used for this drive. This information helps match the module to compatible control racks and existing parameter sets in the same system generation.