Product Description:

The KDA 2.1-050-3-LYS-U1 belongs to the KDA Spindle Drives series produced by Bosch Rexroth Indramat. It is a dedicated spindle drive that converts regulated DC bus power into controlled three-phase output for high-speed machining spindles, allowing precise velocity and torque regulation in CNC and other automated production equipment. By integrating with digital motion controllers, the unit closes the speed loop directly at the motor and reduces low-level regulation demands on the machine control. That control structure is useful where spindle speed must remain stable as cutting load changes. It also supports responsive torque correction during acceleration and deceleration.

The drive is rated for a continuous output current of 50 A, so the connected spindle motor can draw significant current during heavy material removal. Its internal power stage is referenced to a DC bus of 300 VDC, matching the supply levels used by compatible Indramat supply modules. An auxiliary blower receives 115 V at 50/60 Hz, allowing the heatsink fan to operate independently of the DC bus. Cooling is provided by a mounted heatsink blower, which supports steady heat transfer in enclosed cabinets. Independent fan power helps maintain airflow during low-speed spindle operation, when motor-mounted airflow may be limited. Speed reference data are exchanged over the SERCOS interface, giving deterministic fiber-optic communication between the drive and the master controller.

Ambient operation is permitted from 5 to 45 °C, which suits typical shop-floor conditions without special climate control. The unit can be used up to 1000 m above sea level before additional derating is required. Parameter setup and diagnostics are handled through the serial interface (RS-232C), which allows a direct computer connection. The drive also provides a second encoder input and a synchronous input for spindle-mounted position sensors or phase-locking signals. The extra feedback path can also support synchronized threading or tapping cycles when the machine requires a defined angular relationship.