Product Description:

The KDA 3.1-050-3-LYS-U1 is a spindle drive manufactured by Bosch Rexroth Indramat and assigned to the KDA Spindle Drives series. In automated machining centers, this drive supplies controlled three-phase power to high-speed spindle motors, allowing accurate torque and velocity regulation during drilling, milling, or grinding operations. Its role is to translate digital speed commands from the motion controller into regulated motor current while removing waste heat through an integral blower so that continuous duty cycles remain within thermal limits.

The power section is energized from a 300 VDC common bus, and the inverter can deliver a continuous output of 50 A for steady-state spindle loading. The heat sink blower, powered from a dedicated 115 V/50–60 Hz auxiliary line, moves forced air across the fins to stabilize semiconductor temperatures. Drive parameters are adjusted or read through a RS-232-C service port, while velocity references during normal production are received over the SERCOS interface, keeping command latency low and synchronization tight across multiple axes. An integrated heat sink blower is fitted to this model, so no external cooling ducts are required.

The unit uses forced cooling, which allows it to sustain its ratings in ambient shop conditions from 5 to 45 °C. Operation is permitted up to 1000 m above sea level without derating, matching typical plant elevations. Feedback versatility is extended by the presence of a second encoder input and synchronous input, enabling dual-loop control or spindle orientation functions when a separate position transducer is mounted on the workpiece side. The serial and SERCOS links provide separate access paths for diagnostics and recipe changes without interrupting closed-loop speed control.