Product Description:

The Bosch Rexroth Indramat KDA 3.2-100-3-LYS-U1 is a spindle drive in the KDA Spindle Drives series. It converts regulated DC bus energy into controlled three-phase output for high-speed machining spindles, allowing a CNC controller to regulate torque and speed in real time. In machine tools, the unit serves as the dedicated power stage for the spindle axis, so acceleration, braking, and steady running can follow the programmed cutting process. Closed-loop control helps the spindle hold commanded speed when cutting load changes during drilling, milling, or turning. This allows the CNC to match spindle behavior to commanded feed motion during threaded operations and spindle positioning routines. Encoder feedback is returned to the control so the spindle can support synchronized motion functions such as orientation and rigid tapping.

The power section operates from 300 VDC, and the output can reach 100 A under rated spindle load. That current capability supports demanding spindle acceleration and sustained cutting duty without immediate derating. Its heat sink blower uses an auxiliary supply of 115 V/50-60 Hz to support thermal management during continuous operation. A mounted heat sink blower together with forced cooling moves heat away from the power devices and toward the cabinet exterior, which helps the drive maintain stable operation even when spindle speed is low. Heat is expelled directly rather than being left to build up around the heat sink surfaces. This cooling method also reduces dependence on passive airflow inside the cabinet.

Permissible ambient temperature is 5 to 45 °C, and installation altitude must not exceed 1000 m above sea level. Motion commands enter through the fiber-optic SERCOS interface, while the serial interface (RS 232 C) provides a separate connection for diagnostics and local access. The service port can be used without replacing the real-time motion interface used during normal machine operation. The second encoder and synchronous inputs are located on the front panel, allowing direct connection of resolver or incremental feedback from the spindle. Front-access connections also simplify cable routing in machine cabinets where spindle hardware is installed near other motion modules. The unit is Series 3 and Version 2.