Product Description:

The KDA 2.1-100-3-DQ0-U1 is an electronic drive unit from Bosch Rexroth Indramat that belongs to the KDA Spindle Drives series. Designed for CNC machine tools and machining centers, it converts a fixed DC bus into variable three-phase output for high-speed spindle motors, allowing precise velocity and torque regulation in metal-cutting applications. This arrangement lets the spindle follow programmed speed changes during drilling, milling, and contouring operations where stable rotation affects surface finish and tool life. The drive supports digital velocity commands and uses an integrated blower to extract heat from its power electronics, keeping the heat sink temperature within permissible limits during continuous duty.

It operates from a DC bus of 300 VDC and can deliver up to 100 A of line current to the spindle motor, so the connected machine can sustain high cutting loads without stall during demanding cycles. Thermal management uses forced cooling, and the power section is paired with a heat sink-mounted blower that directs airflow across the fins. That fan receives its own supply of 115 V/50–60 Hz, allowing the cooling circuit to remain active even when the main DC link is momentarily disabled. Command data reaches the drive over a parallel bus, and no additional interface option is fitted, which keeps the control layout straightforward.

The unit is intended for ambient temperatures from 5 to 45 °C and for installation up to 1000 m above sea level, allowing use in typical factory environments without extra climate control. The digital control channel accepts a digital 16-bit parallel input speed word, so velocity changes pass through the current regulators with minimal quantization error and consistent spindle response. This command structure suits machine controls that provide deterministic parallel speed data to the spindle axis. The drive is Series 2 within the KDA platform.