Product Description:

The KDA 3.1-050-3-L0I-W1 belongs to the KDA Spindle Drives series manufactured by Bosch Rexroth Indramat. It is a spindle drive module that supplies regulated three-phase power and speed commands to motorized machine-tool spindles. In machine tools, it serves as the electrical interface between the control system and the spindle motor. This allows precise cutting, drilling, or grinding cycles in automated production cells. It also helps the spindle maintain commanded speed as cutting loads change during operation.

This drive is energized from a DC bus of 300 V DC, so the upstream supply or power supply module must maintain that bus level for correct operation. When loaded continuously, the unit can deliver a rated current of 50 A, which indicates its continuous output capability for the connected spindle motor. An internal single-phase auxiliary feed of 220 V at 50/60 Hz powers the blower, allowing cooling air to continue moving during coast-down after the main DC link is switched off. Thermal management is handled by a mounted heat sink blower that forces air across the power semiconductors, and the overall cooling method is forced cooling. Stable blower operation reduces thermal stress on the power stage and supports consistent performance during long machining cycles.

The drive operates in ambient temperatures from 5 to 45 °C and at installation elevations up to 1000 m above sea level. Feedback to the control system is available through an incremental encoder output, while velocity commands reach the device over the SERCOS interface for fiber-optic communication with synchronous cycle times. The encoder output can be used for speed-related monitoring signals, while the communication link carries command data from the higher-level control. A second encoder channel is not provided, so applications that require dual feedback loops need an external module. The drive is built in Series 3 and should be installed in an enclosure that keeps the forced-air path clear.