Product Description:

The KDA 2.1-050-3-APS-W1 is a spindle drive produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. Designed as the axis power stage for numerically controlled machine tools, this unit converts the regulated DC bus energy from an Indramat supply module into three-phase output for high-speed spindle motors. By integrating current, velocity, and position control loops, the drive enables precise cutting, drilling, or grinding operations that require repeatable rotary motion in industrial automation. It forms part of a modular drive package and interfaces directly with Indramat CNC controllers.

Internally, the DC link of 300 VDC powers the output stage, and the unit can deliver a continuous phase current of 50 A to the spindle windings, supporting rapid acceleration and constant torque under load. Speed reference data arrive through an analog command channel, while parameter access and diagnostic messaging are handled by a serial interface (RS 232 C). Thermal energy is removed through a heat sink that operates in forced cooling mode, allowing rated current to be maintained during prolonged machining cycles. A secondary encoder socket is provided so the controller can process spindle feedback or an additional motor feedback stream for synchronized motion.

The heat sink blower is supplied from an auxiliary line of 220 V/50-60 Hz, isolating fan load from the DC bus and protecting the power electronics. Because the cooling assembly is a mounted heat sink blower, installation requires only cabinet wall clearance and no external ducting. The drive is specified for ambient conditions between 5 to 45 degrees Celsius and for siting up to 1000 m above sea level, so typical factory floors and low-elevation plants fall within its operating range. Hardware revision 2 supports stable regulation when the unit controls a spindle or auxiliary motor through the second encoder port.