Product Description:

The KDA 2.1-100-3-AQS-W1 is a spindle drive module from Bosch Rexroth Indramat that belongs to the KDA Spindle Drives series. It regulates high-speed machining spindles by converting regulated DC bus energy into controlled three-phase output for induction or synchronous motors used in CNC equipment. Positioned as a second-generation drive within the line, the unit interfaces with master NC controllers to provide precise speed regulation, torque limiting, and fault monitoring required for automated milling, drilling, and grinding centers.

The drive is sized for a continuous output of 100 A, which is the maximum motor phase current it can supply without thermal derating. Its internal DC link is energized from an external bus at 300 VDC, so the connected power supply must maintain this voltage to preserve dynamic response. Speed commands arrive as an analog reference, allowing ±10 V velocity setpoints to be issued by conventional CNC controllers. Parameter uploading and service diagnostics are available through an RS 232 C serial interface, removing the need for proprietary handheld units. To operate the heat sink blower, the module brings in an auxiliary feed of 220 V/50–60 Hz, separating cooling power from the main DC bus and preventing voltage sag during high spindle load.

Thermal management is carried out with a mounted heat sink blower that draws air directly across the power semiconductors, and this hardware uses forced cooling to keep junction temperatures within limits during rapid acceleration. The ambient operating envelope extends from 5 to 45 °C, so cabinet ventilation must be planned if surrounding temperatures rise above that span. Installations are permitted up to 1000 m above sea level without current reduction, which covers most plant elevations. The generation-2 control core supports stable spindle speed regulation during changes in load and ambient conditions.