Product Description:

The KDA 2.1-150-3-LY0-W1 is a spindle drive manufactured by Bosch Rexroth Indramat for the KDA Spindle Drives series. Installed in CNC machining centers, it converts a regulated DC bus into three-phase spindle power so that cutting tools can accelerate, decelerate, or hold speed precisely under numerical control. By linking the motion controller to the motor field power stage, it supports the velocity and torque consistency required for accurate milling, turning, and grinding operations. This arrangement is useful in spindle applications that demand stable speed during heavy cuts and repeatable orientation during tool changes.

Several operating limits govern cabinet layout and field wiring. An auxiliary line of 220 V/50–60 Hz powers the heat sink blower that removes switching heat from the IGBTs. The power section is tied to a bus of 300 VDC, and within this range the amplifier can supply up to 150 A of continuous phase current to the spindle windings. Operation is permitted at ambient temperatures from 5 to 45 °C and at elevations up to 1000 m above sea level, provided cabinet clearances and airflow are maintained. These limits keep semiconductor and insulation temperatures within the intended operating range during prolonged duty cycles.

Command data is delivered over the SERCOS interface, providing a deterministic fiber-optic channel for velocity setpoints and status words. Heat rejection relies on a self-contained mounted heat sink blower that uses forced cooling, so the unit requires a routed mains stub and a clear exhaust path. For spindle orientation tasks, the drive includes a second encoder input and synchronous input, which let it process an additional feedback stream for electronic gearing or tool-change alignment without external relay logic. No additional interface option is present, which keeps the wiring scheme concise.