Product Description:

The KDA 3.2-100-3-API-W1 is a spindle drive manufactured by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. Designed to power high-speed machine-tool spindles, the unit converts a regulated DC link into three-phase motor output for milling, turning, and grinding centers. Integrated logic channels let the drive exchange position and velocity data with CNC controllers, allowing it to act as the main interface between the control system and a synchronous or induction spindle motor. This arrangement supports stable speed regulation during cutting cycles where spindle load can change rapidly.

The drive draws its intermediate circuit energy from a 300 VDC supply, and this voltage sets the amplitude of the synthesized three-phase output delivered to the spindle motor. Under continuous duty, the current path is rated at 100 A, so peak demand must stay within this limit to avoid overcurrent diagnostics. Thermal regulation is handled by a mounted heat sink blower that forces air through the aluminum fins attached to the power module. Because the fan uses forced cooling, it can maintain steady airflow regardless of cabinet temperature. The blower is powered from a dedicated 220 V/50-60 Hz socket, which keeps blower transients separate from the control electronics.

For proper operation, the drive must be installed where the ambient air stays between 5 °C and 45 °C, allowing internal thermal management to keep the power bridge within safe limits without derating. Elevation should not exceed 1000 m above sea level because thinner air reduces cooling performance. A second encoder input accepts spindle-mounted feedback, and the front panel provides an incremental encoder output that passes position data to the CNC. That signal can be used by the CNC for coordinated motion functions that depend on spindle position information. Speed references are accepted as analog signals, allowing straightforward integration with voltage-commanded control loops.