Product Description:

The KDA 3.1-100-3-DYS-W1 belongs to the KDA Spindle Drives series from Bosch Rexroth Indramat. As a spindle drive, it regulates high-speed motors used for machining, positioning, and other continuous-duty tasks that need precise torque control. Hardware release 3 includes integrated diagnostics, so the unit can link directly to Indramat motion controllers and maintain stable spindle operation in automated production lines.

This model draws its power from a DC bus rated at 300 VDC and can deliver a continuous phase output of 100 A, enabling it to run large spindles without current derating. Digital velocity references are accepted through a 16-bit parallel digital command word, which provides fine speed resolution for contouring or tapping cycles. Thermal operation is specified for ambient temperatures of 5 to 45 °C; within this range, the internal monitoring suppresses torque reduction. The heat sink blower is fed by an auxiliary AC tap of 220 V/50-60 Hz, isolating cooling airflow from the main DC circuit and maintaining consistent fan speed even as bus voltage fluctuates. Forced cooling channels that airflow through the mounted exchanger so semiconductor junctions remain below their design limits during rapid acceleration.

Installation guidelines limit placement to 1000 m above sea level, ensuring the forced-air path still removes heat at lower air densities. Interface flexibility is extended by an RS-232-C serial interface for parameter upload, trace functions, and alarm logging, while feedback redundancy is provided by a second encoder input and synchronous input that lets the drive compare spindle position against a secondary scale. The cooling assembly uses a mounted heat sink blower, which is pre-wired to the chassis so only the AC blower supply must be routed. This layout keeps the cooling assembly separate from the main DC circuit and supports consistent thermal performance.