Product Description:

The KDA 3.2-100-3-LPS-U1 is a spindle drive manufactured by Bosch Rexroth Indramat within the KDA Spindle Drives series. In an automated machining cell, this unit closes the power loop between the control system and a high-speed spindle motor, converting regulated DC bus energy into three-phase drive current while monitoring position through its encoder channels. By coordinating speed commands with actual spindle feedback, it maintains constant surface feet per minute during cutting, drilling, or grinding operations and permits rapid acceleration for tool changes.

The drive delivers a continuous output of 100 A, a current level sized for medium-frame spindle motors that require substantial startup torque and fast runout. Its internal power section draws from a 300 VDC link supplied by the machine’s common bus, and the dedicated heatsink blower runs on an auxiliary line rated at 115 V/50–60 Hz; separating these supplies prevents blower load from disturbing the DC bus. The unit operates reliably between 5 to 45 °C, keeping thermal drift in the power semiconductors within calibration margins. Installation is approved up to 1000 m above sea level, so derating for reduced air density is unnecessary on most factory floors.

Heat removal is handled by forced cooling through a finned plate, and the fan and ducting are integrated as a single mounted heatsink blower, simplifying cabinet layouts. Command data flow is digital: velocity setpoints arrive over the real-time bus via the SERCOS interface, while diagnostic and parameter uploads can be executed through the auxiliary RS-232C port. A second encoder socket lets the user route spindle or auxiliary motor feedback directly to the drive, enabling electronic gearing or orientation functions without additional interface cards.