Product Description:

The KDA 2.1-100-3-LQ0-W1 is a closed-loop spindle drive manufactured by Bosch Rexroth Indramat and delivered as part of the KDA Spindle Drives series. Designed to regulate the torque and speed of motorized spindles in machine-tool or transfer-line applications, the unit converts a common DC link voltage into three-phase output while coordinating motion through the embedded command channel. By pairing with Indramat supply modules, the drive forms the axis-specific power stage that maintains constant spindle velocity during cutting, drilling, or grinding cycles. This control approach helps the spindle maintain stable speed when cutting load changes during machining.

Electrical performance is based on a DC bus of 300 VDC, and this voltage is supplied by a separate power module. Continuous phase current reaches 100 A, allowing the controller to energize high-power spindles without saturation. Thermal energy is removed by a mounted heat sink blower that provides forced cooling; the blower itself is powered from an auxiliary line of 220 V, 50–60 Hz, so spindle duty is not dependent on passive cabinet airflow. Velocity setpoints are transmitted digitally through the SERCOS interface, which carries precise reference values along with error and status words for coordinated multi-axis machining.

The drive maintains rated data between 5 to 45 °C and up to 1000 m above sea level, so it can operate in most factory environments without derating. The unit is Series 2, and its parameter memory card and mounting dimensions follow that product generation. The drive has no additional interface option, which reduces internal wiring and grounding paths. The integral heat sink blower is built into the enclosure, leaving only the DC bus, command fiber, and motor leads for system wiring.