Product Description:

The KDA 2.1-150-3-A0S-W1 belongs to the KDA Spindle Drives series from Bosch Rexroth Indramat. As a spindle drive, it converts regulated DC bus power into three-phase output for high-speed machine tool spindles. This lets CNC controllers impose precise velocity and torque commands during metal-cutting or grinding operations. The platform is intended for machine tool applications that require stable speed regulation and quick response to changing load conditions.

This unit draws its DC link energy from a bus of 300 VDC. A continuous output of 150 A lets the drive energize large-frame asynchronous or synchronous spindle motors without current derating. That current capacity supports sustained spindle loading during machining cycles where torque demand remains high for extended periods. The integral heat sink blower is powered by an auxiliary source rated at 220 V/50-60 Hz, so the fan circuit requires a single-phase feed. For controller integration, a dedicated serial channel using RS-232-C signaling supports parameter transfer, status polling, and basic diagnostics over standard PLC or PC ports.

Thermal management relies on a mounted heat sink blower that pushes air through the fin stack. This active path combines with forced cooling to maintain junction temperatures during long duty cycles. Reliable operation is specified for ambient conditions between 5 to 45 °C, allowing installation in ventilated work areas that are not necessarily climate-controlled. Altitude is limited to 1000 m above sea level because thinner air reduces fan effectiveness. Because speed reference signals are accepted as an analog voltage, retrofit projects can keep existing ±10 V motion cards without adding fieldbus interfaces. The absence of a second-encoder socket simplifies wiring for spindle motors that already use the primary resolver channel for feedback.