Product Description:

The KDA 3.1-100-3-L00-U1 is a spindle drive module produced by Bosch Rexroth Indramat and assigned to the KDA Spindle Drives series. It is installed between the mains rectifier and the motor to regulate torque and speed for high-speed machining spindles in automated production cells. The unit belongs to the third design release of the family and provides closed-loop drive control, while the heat sink blower uses a separate AC supply for continuous thermal management. This arrangement helps the module respond to load changes during spindle acceleration, deceleration, and steady cutting operation.

Internally, the power section is energized from a DC bus of 300 VDC. Under continuous duty, the drive can deliver a rated phase current of 100 A, so the matching motor and cabling must be sized accordingly. Thermal losses are removed by a mounted heat sink blower, and the unit uses forced cooling to keep semiconductor junctions within their allowable temperature range during heavy acceleration cycles. The blower itself operates from an auxiliary source of 115 V/50-60 Hz, so the control cabinet needs a single-phase supply branch for that circuit. Because there is no additional interface option and no second encoder input, wiring is simpler but multi-feedback configurations are not available.

The drive operates at ambient temperatures from 5 to 45 °C without derating. Installation is permitted up to 1000 m above sea level, allowing use at standard plant elevations before reduced air density affects cooling. Speed reference data arrives digitally through the SERCOS interface, enabling synchronized motion commands with other axis controllers in networked machines. The unit is part of Series 3, and the absence of extra option cards reduces enclosure depth and helps airflow around the chassis. Digital command transmission also supports applications where spindle speed must follow coordinated machine sequences.