Product Description:

The KDA 2.1-100-3-A0S-W1 is a spindle drive module manufactured by Bosch Rexroth Indramat for the KDA Spindle Drives series. Installed in the power section of a CNC cabinet, it modulates motor current and voltage so that high-speed spindles follow commanded velocity profiles during metal-cutting or woodworking cycles. The drive links to a shared DC bus, exchanges status with the machine controller, and contributes dynamic braking energy back to the supply section to support coordinated multi-axis machining.

This module draws its operating power from a regulated bus of 300 VDC and can deliver up to 100 A of continuous output current to the spindle motor, a level suited for large-frame induction or synchronous designs. Thermal energy is extracted through a mounted heat sink blower that receives its own AC feed of 220 V at 50/60 Hz, and the dedicated blower maintains airflow across the fins even when cabinet air is stagnant. The cooling arrangement uses forced cooling, so internal semiconductor temperatures remain within range at full current. Speed information is returned from the primary encoder, but a second encoder port is not fitted, which reduces wiring when dual feedback is unnecessary.

Operating conditions allow cabinet air between 5 to 45 °C, and the unit can be mounted at elevations up to 1000 m above sea level without derating, which matches the conditions of most production halls. Commanded velocity arrives as an analog reference, enabling straightforward connection to older PLC analog output cards or modern motion controllers that still provide ±10 V channels. For diagnostics and parameter adjustment, a service PC can be connected through the built-in serial interface (RS-232-C). This connection allows access to actual current, error codes, and status data without removing the drive from service.