Product Description:

The KDA 3.1-100-3-LY0-U1 is a spindle-drive module manufactured by Bosch Rexroth Indramat within the KDA Spindle Drives series. It is classified as release 3 hardware and forms the power section that governs torque and velocity for CNC machining spindles, converting the shared DC bus into a controlled three-phase output for the motor. By tracking motor feedback and forwarding that data to the numerical controller in real time, the drive supports accurate cut depth, stable spindle speed, and consistent surface finish without relying on mechanical speed gearboxes inside the control cabinet.

This module runs from a DC link of 300 VDC and can deliver a continuous phase current of 100 A to the connected motor. Thermal energy is removed by a factory-mounted mounted heat sink blower, and that blower uses an auxiliary supply of 115 V at 50/60 Hz. Airflow passes across the heat sink fins through forced cooling, which helps keep semiconductor temperatures within their operating range during high-duty cycles. Because the housing already contains the fan package, no additional cooling interface is fitted, and current derating, motor overtemperature, and bus-voltage faults are monitored internally. This arrangement reduces the number of external protective functions required from the higher-level controller.

The unit operates in ambient temperatures from 5 to 45 °C and can be installed up to 1000 m above sea level without output reduction. Speed reference data is exchanged over the real-time SERCOS interface, allowing deterministic setpoint updates that match multi-axis interpolation demands in CNC systems. Position verification is supported by a dedicated second encoder input and synchronous input, which allows a spindle-mounted encoder to work alongside the primary feedback channel for rigid tapping and orientation tasks. This arrangement supports spindle angle synchronization with feed motion during tapping cycles.