Product Description:

The KDA 2.1-100-3-AP0-U1 spindle drive is produced by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. Classified as a spindle drive, it regulates high-speed machining spindles by converting DC bus power into three-phase motor current while exchanging control signals with the numerical controller. Within a multi-axis machining center, it functions as the dedicated converter that drives the tool spindle and processes position feedback for closed-loop automation.

This unit is built in hardware series 2 and operates from a DC bus of 300 VDC, which energizes its inverter stage. A continuous output capability of 100 A allows the drive to supply medium-frame induction or synchronous spindles without derating. Thermal energy from the switching devices is removed through a heat sink-mounted blower; the arrangement is designated as forced cooling, which keeps semiconductor junctions within limits during extended cutting cycles. Speed reference is accepted as an analog command, so ±10 V velocity signals from most CNC controllers connect directly. The configuration includes no additional interface option, reducing cabinet complexity when only standard spindle functions are required.

The blower itself runs from a separate supply of 115 V/50-60 Hz, so the fan circuit requires a protected single-phase feed. Correct operation is specified between 5 to 45 °C; within this range the cooling system maintains stable device temperatures. The drive can be mounted up to 1000 m above sea level without derating because air density remains adequate for heat removal. A second encoder input is available, enabling either high-resolution spindle feedback or an additional motor feedback channel to support dual-loop positioning. Because no auxiliary interface slots are present, any further system expansion must be handled at the controller level.