Product Description:

The KDA 3.3-100-3-APD-U1 spindle drive is manufactured by Bosch Rexroth Indramat for the KDA Spindle Drives series. It is designed to translate controller commands into three-phase power that regulates high-speed machine-tool spindles, allowing precise velocity and torque control in automated milling, drilling, and grinding cells. Model designator “3” identifies the third release within the series, and its internal circuitry is optimized for operation from a common DC bus in multi-axis systems.

The power section accepts a bus voltage of 300 VDC and can deliver a continuous output of 100 A to the connected spindle motor. Thermal stability is maintained through Forced Cooling; this mode drives air across the heat sink so full current is available without derating. The integral blower is supplied from an auxiliary source rated at 115V/50-60Hz, isolating fan load from the main DC path. Speed reference enters the drive as an Analogue command, enabling proportional control from CNC hardware or external regulators while the internal current controllers close the torque loop.

A separate interface accepts a Position command value, digital, allowing higher-level systems to synchronize spindle orientation during tool change or tapping cycles. The unit is specified for ambient conditions between 5 to 45 Degrees Celsius and installation up to 1000M above sea level without additional cooling provisions. A Mounted Heatsink Blower directs airflow rearward, simplifying cabinet layout and ensuring the aluminum fin stack remains below critical temperature. For applications that demand closed-loop speed and positioning, a second encoder input is available so the drive can process spindle feedback or auxiliary motor feedback simultaneously with the primary resolver signal.