Product Description:

The KDA 3.1-100-3-LPD-U1 is a spindle drive module manufactured by Bosch Rexroth Indramat within the KDA Spindle Drives series. Operating as part of a multi-axis motion package, it receives regulated DC bus energy from a supply unit and generates controlled three-phase output to a motor-integrated spindle. The drive handles command telegrams from CNC or PLC controllers and returns diagnostic data, allowing accurate torque and velocity regulation for metal-cutting, woodworking, and general automation centers.

The drive is supplied from a DC link of 300 VDC, a voltage level common to Indramat supply modules and sufficient to energize medium-power spindle motors. Continuous motor current can reach 100 A, so matching power cabling and protective devices must account for this load. Thermal management is handled by a blower mounted on the heat sink; the fan is powered from an auxiliary line of 115 V at 50/60 Hz and delivers airflow in a closed housing. This arrangement uses forced cooling, keeping device temperatures within limits during high-duty cycles. Speed setpoints are accepted through the SERCOS interface, allowing deterministic communication with motion controllers and synchronous updating of multiple axes.

The permissible ambient temperature range is 5 to 45 °C, so cabinet air conditioning is required only when local temperatures exceed this window. Installation is allowed up to 1000 m above sea level without derating, which suits most factory locations. For position loops, the controller provides a separate channel for a digital position command value, adding coarse motion coordination beyond the primary speed channel. A second encoder input can be wired for spindle feedback or supplementary motor feedback, enabling high-resolution monitoring during tapping, orientation, or tool-change routines.