Product Description:

Bosch Rexroth Indramat builds the KDA 2.1-100-3-A00-W1-220 spindle drive for machine-tool and automation axes that require high-current inverter control. The unit belongs to the KDA Spindle Drives series, is hardware version 2, and converts a regulated DC bus into three-phase power for induction or synchronous spindles. Within an automation cabinet, it acts as the drive stage, accepting analog speed commands from the CNC controller and modulating motor torque so it serves as the electrical interface between the power source and high-speed cutting or positioning loads.

The power section is energized from a DC link of 300 V DC, and this voltage is the reference for its IGBT bridge and maximum output frequency range. Under continuous duty, the inverter can deliver a rated phase current of 100 A, allowing it to drive large spindle motors without thermal derating. Heat generated in the semiconductors is extracted by a mounted heat sink blower that is installed on the drive’s rear panel. This active device operates in a forced cooling mode, drawing cabinet air across the fins to maintain component temperature. Safe operation is specified for ambient conditions between 5 to 45 degrees Celsius, so additional cabinet ventilation is only necessary when process heat pushes temperatures beyond that range.

The blower itself draws power from an auxiliary supply of 220 V at 50/60 Hz, ensuring stable airflow even when the spindle is stationary. Speed reference data enter the controller as a single-channel analog signal, and no digital fieldbus is provided because the option list states no additional interface option. The module can be mounted up to 1000 m above sea level without output derating; above that elevation, the cooling profile should be reevaluated. A second encoder input is not available, so position feedback remains limited to the primary spindle sensor supplied with the machine tool.