Product Description:

The KDA 3.2-050-3-L0I-U1 is a spindle drive module manufactured by Bosch Rexroth Indramat for the KDA Spindle Drives series. It is designed to regulate the torque and speed of motorized spindles in CNC machines and machining centers, translating command data into controlled three-phase output for the connected motor. Command data is received through a fiber-optic control link rather than an analog reference, which supports coordinated spindle behavior within multi-axis automation systems. This type of drive is commonly used where stable spindle response is needed during cutting, drilling, and milling cycles.

Its power section is fed from a DC bus rated at 300 VDC, and at this link voltage the drive can supply up to 50 A of continuous output current to the spindle windings. The heat sink blower operates from a single-phase supply of 115 V/50–60 Hz, so the cooling assembly can run whenever cabinet power is available. Heat removal is handled through forced cooling, which moves air across the heat sink to control semiconductor temperature during sustained spindle load. For feedback forwarding, the additional interface provides an incremental encoder output so a downstream controller can receive actual spindle position data. This arrangement supports monitoring by external control hardware without requiring a separate position conversion stage inside the cabinet.

The permissible ambient range is 5–45 °C, and installation height is limited to 1000 m above sea level to preserve adequate air density for cooling. Speed commands are transmitted over the SERCOS interface, allowing synchronized control and digital communication without analog speed wiring. Thermal energy is removed by a mounted heat sink blower attached directly to the aluminum cooling fins, which helps the drive maintain stable operation in enclosed cabinets. No second encoder input is provided, so the connector area remains compact and the feedback path is limited to a single channel.