Product Description:

The KDA 3.1-100-3-AQS-W1 spindle drive is manufactured by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. In an industrial automation cell, the unit sits between a regulated DC bus supply and a motor spindle, converting constant bus energy into variable three-phase power so CNC controllers can command rapid acceleration, deceleration, and steady-state cutting speeds for metalworking or woodworking machinery. This arrangement allows the drive to maintain responsive spindle control during changing process loads and varying speed demands.

The drive is dimensioned for a continuous output of 100 A, giving it the current headroom needed for large-frame or high-inertia spindles. Its power stage is supplied from a common bus of 300 VDC, which simplifies cabinet wiring because multiple axes can share one supply module. Internal control electronics accept an analog speed reference, and the front end interprets that command as an analog signal for precise PWM gating of the inverter bridge. A dedicated auxiliary input of 220 V at 50–60 Hz energizes the heat sink blower so thermal performance remains constant regardless of spindle load. A serial data channel is present for parameter backup and diagnostics through a standard RS-232 port.

Thermal management relies on a mounted heat sink blower positioned directly on the rear plate, and this arrangement works with forced cooling to expel heat without enlarging the cabinet footprint. Reliable operation is specified across an ambient range of 5 to 45 °C, matching typical shop-floor climates, and the electronics are rated for installation heights up to 1000 m above sea level without derating. Communication and service tasks use the built-in RS-232-C interface, which provides a low-level link for diagnostics, trace functions, and spindle parameter adjustment while the analog channel handles the real-time velocity loop.