Product Description:

The KDA 2.1-100-3-DYD-U1 is a spindle drive produced by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. It is part of series 2, which indicates the product generation used within this drive line. The module works as the power and control interface between the machine controller and a motorized spindle, executing speed or position commands in automated milling, grinding, or drilling equipment where high repeatability is required. In machine tool operation, it converts control commands into regulated motor current so the spindle can maintain stable speed during cutting and accurate positioning during indexing.

This unit operates from a DC bus of 300 VDC and can deliver a continuous phase current of 100 A, allowing direct connection to large spindle motors without an external transformer. Its internal heat sink blower uses an auxiliary supply rated at 115 V/50-60 Hz, and the mounted heat sink blower provides forced convection so internal semiconductors remain within temperature limits during acceleration and sustained spindle loading. Speed references arrive through a 16-bit parallel digital interface, which gives the controller fine command resolution while avoiding the noise sensitivity associated with analog reference signals. This cooling arrangement supports full rated output when the housing is installed inside a sealed electrical cabinet.

The drive is designed for ambient temperatures from 5 to 45 °C and installation heights up to 1000 m above sea level before derating is required, making it suitable for typical factory environments. For machines that require synchronized positioning, the unit includes a digital position command interface. A second encoder input and synchronous input allows the control system to verify spindle angle or support synchronized operation with another axis. Reliable operation also depends on unobstructed airflow around the blower intake and exhaust, so the surrounding cabinet layout must leave clear air paths for cooling.