Product Description:

Bosch Rexroth Indramat supplies the KDA 2.1-100-3-L0S-W1 as part of the KDA Spindle Drives series. The unit is a cabinet-mounted drive module that powers and controls machine-tool spindles in automated production lines. By converting the shared 300 V DC link into a regulated three-phase output, it enables precise adjustment of spindle speed and torque under CNC supervision. Version 2 hardware fits into Indramat multi-axis cabinets and works with an external heatsink blower for high-duty metal-cutting applications. This arrangement supports spindle operation in systems that use a common DC power architecture across multiple axes.

Electrical capability centers on a continuous output of 100 A, allowing the drive to start and accelerate large-frame spindle motors without stalling. The internal power stage is energized from a DC bus of 300 VDC, which simplifies cabinet wiring because a single rectifier can supply several axes. A dedicated blower draws from an AC source rated at 220 V, 50/60 Hz, so airflow remains constant even when the spindle is idle. Velocity commands arrive through a SERCOS interface, which provides deterministic fiber-optic communication with the CNC. A front-panel port also provides an RS-232-C serial interface for diagnostics and parameter adjustment with a laptop.

Thermal behavior is managed through forced cooling delivered by the external mounted heatsink blower, which removes transistor heat at the rear panel and helps keep neighboring modules within their temperature limits. Reliable operation is specified for ambient temperatures from 5 to 45 °C, so the cabinet does not require special conditioning in most shop environments. Installations can be placed up to 1000 m above sea level without derating, which suits plants at moderate altitude. Because the controller does not include a second encoder input, spindle-orientation feedback is handled through the primary encoder loop selected by the machine designer. The cooling layout keeps heat extraction separate from the control section, which supports stable operation during long machining cycles.