Product Description:

Bosch Rexroth Indramat's KDA 2.1-150-3-LYS-U1 belongs to the KDA Spindle Drives series and is part of generation 2. The module functions as a spindle drive controller that supplies regulated power and feedback processing for high-speed machine-tool spindles. This supports coordinated acceleration, braking, and stable speed holding during metal-cutting and grinding cycles in CNC automation. Its role is to translate control commands into the electrical output needed for accurate spindle behavior during changing machining loads.

The power stage is energized from a DC bus of 300 VDC, and its output channel can deliver a continuous motor phase current of 150 A. This current rating indicates the maximum electromagnetic torque the connected spindle can sustain without thermal overload. Internal electronics, fans, and alarms draw from a heat sink blower supply of 115 V/50–60 Hz, so the system requires a low-voltage single-phase source. Velocity commands are accepted through the digital SERCOS interface, which transfers setpoints and status words in real time for coordinated spindle control. For legacy host controls or service terminals, an RS-232C serial port is also present for parameter transfer and diagnostics.

Thermal management relies on a mounted heat sink blower that expels waste heat through fin channels, and the air path uses forced cooling. For proper operation, airflow around the cooling path must remain unobstructed. The unit can be installed where ambient temperatures stay between 5 to 45 °C, and performance data remain valid up to 1000 m above sea level before derating is required. Position feedback options include a second encoder input and a synchronous probe input for precise spindle orientation during tool changes. These additional inputs support positioning tasks that require accurate angular alignment.