Product Description:

The KDA 3.1-100-3-D0D-W1 is a spindle drive produced by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. As a spindle drive, it supplies controlled three-phase power to high-speed machining or grinding spindles and accepts digital motion references from the CNC. The unit forms the power stage in closed-loop axis packages where the CNC, feedback encoder, and this drive work together to regulate rotational velocity and torque during industrial automation tasks such as metal cutting.

In normal operation, the internal power electronics are supplied from a constant DC bus of 300 VDC; this voltage comes from an external supply module shared by multiple axes. The drive can deliver up to 100 A of continuous output current, a level suited to medium-to-large spindle motors that demand high acceleration torque. Speed reference data reach the control board through a digital 16-bit parallel channel, allowing 65,536 discrete velocity commands without D/A conversion noise. Separate contouring commands can be provided through an additional interface that carries a digital position command value, supporting synchronized spindle positioning for tapping cycles. Thermal energy generated by the output devices is removed through a forced cooling arrangement that keeps junction temperatures within limits during sustained load.

Environmental and auxiliary supply limits set the installation range. The heat sink fan operates from an independent supply of 220 V 50–60 Hz, so the drive requires a separate single-phase feed for the blower. The cooling hardware uses a heat sink-mounted blower fitted directly to the rear of the unit, ensuring airflow even in compact cabinets. Continuous duty is permitted when ambient air remains between 5 to 45 °C, and no derating is specified for sites up to 1000 m above sea level. The electronics do not include a second encoder input, so external devices must handle feedback multiplexing if two feedback sources are required.