Product Description:

The KDA 3.1-100-3-D0D-U1 belongs to the KDA Spindle Drives series produced by Bosch Rexroth Indramat. As a spindle drive, it supplies regulated three-phase power to high-speed motorized spindles while monitoring current and velocity loops in real time. Revision 3 hardware incorporates an integrated heatsink blower and multiple digital reference channels so the unit can be placed inside a control cabinet and linked directly to CNC or PLC motion controllers.

This drive is powered from a DC bus of 300 VDC and can deliver a continuous output of 100 A to the spindle windings. A separate heatsink fan is fed by an auxiliary line of 115 V/50-60 Hz; separating the blower supply from the DC link prevents load fluctuations from disturbing the power stage. The heatsink sits on the top edge of the housing and operates with forced cooling, pulling air through the fins to maintain semiconductor junction temperatures during high duty cycles. Reliable operation is specified for ambient temperatures from 5 to 45 °C, so the cabinet must stay inside this range to avoid thermal derating of the current regulator.

The installation altitude is limited to 1000 m above sea level, ensuring the fan’s airflow remains sufficient at reduced air density. Axis commands enter through a dedicated interface that carries the digital position command value, allowing coordinated motion with other axes on the machine. Speed regulation uses a 16-bit parallel digital word, which provides fine resolution for spindle orientation tasks. Because there is no second encoder input, position feedback must be supplied solely by the primary spindle encoder routed to the controller rack, simplifying wiring but requiring careful noise shielding of that single feedback channel.