Product Description:

The KDA 2.1-050-3-D00-U1 is a spindle drive module manufactured by Bosch Rexroth Indramat for the KDA Spindle Drives series. The unit converts regulated DC bus power into variable-frequency output for high-speed spindle motors used in machine tools and similar automated equipment. By integrating drive control with a dedicated heat sink blower, it provides a self-contained solution for continuous speed regulation in production cells and machining centers.

Operating power is drawn from a regulated DC bus at 300 VDC, and from this supply the drive can deliver a continuous phase current of 50 A to the connected spindle motor. Internal electronics obtain auxiliary cooling power from an AC source rated at 115 V, 50/60 Hz, which feeds the drive’s mounted blower. That blower provides forced cooling through a dedicated channel, and the air mover is a mounted heat sink blower fixed directly to the rear panel so heat generated by the IGBT stage is removed before it reaches a critical junction temperature. This cooling arrangement supports continuous spindle operation and helps keep the power stage within its intended thermal range.

The controller operates in ambient air between 5 to 45 degrees Celsius and maintains full ratings when the cabinet is installed no higher than 1000 m above sea level. Command data is accepted on a parallel bus with 16-bit parallel digital resolution, enabling quick load-to-speed transitions that are important during tool change cycles and rapid spindle response. The hardware belongs to series revision 2, which identifies the product generation within this drive line. The design omits a secondary encoder and optional interface cards, so wiring remains straightforward and panel space requirements stay lower in cabinets built around standardized spindle drive modules.