Product Description:

The KDA 3.1-100-3-LQS-W1 spindle drive module is manufactured by Bosch Rexroth Indramat for the KDA Spindle Drives series. Installed inside a machine-tool cabinet, the unit energizes three-phase spindle motors from a regulated DC link while accepting digital speed commands from higher-level motion controllers. By integrating power electronics, cooling hardware, and communication functions in one chassis, it forms the core of closed-loop spindle control stages used in milling, turning, and grinding equipment. This arrangement lets the spindle respond quickly to command changes and maintain stable torque during cutting cycles.

The converter operates from a nominal 300 VDC bus and can supply up to 100 A of continuous phase current, allowing high-torque acceleration without external boost modules. A dedicated blower is powered by a separate 220 V AC 50–60 Hz feed so thermal management remains active even when the main bus is discharged. The separate blower supply keeps airflow available during shutdown and restart conditions. Heat is removed through forced cooling, permitting full current at rated cabinet temperatures. The permissible ambient range is 5 to 45 °C, and no derating is required until the installation exceeds 1000 m above sea level. These limits set the allowable operating range for the drive and should be observed when the cabinet layout and power path are planned.

Control connectivity follows the drive’s hardware revision, identified as Series 3. For local setup and diagnostics, a computer connects through a serial interface (RS 232 C) that provides access to parameter lists and error histories. During production, the velocity loop is closed by a SERCOS interface, enabling synchronous spindle speed changes that track linear axis motion in multi-channel CNC cells. By separating local setup, diagnostics, and real-time channels, the drive maintains deterministic cycle times while still allowing diagnostic access during operation.