Product Description:

The KDA 3.1-050-3-DQS-W1 spindle drive is produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. It functions as the power interface between the CNC controller and a high-speed spindle motor, supplying regulated three-phase output and monitoring feedback to maintain commanded speed during cutting, milling, or grinding operations. By integrating its own heat sink blower and digital logic, the drive supports rapid spindle acceleration while keeping internal temperatures within safe limits for continuous industrial service.

The power section is dimensioned for a continuous output of 50 A, allowing the connected motor to reach high torque values without overloading the drive transistors. A dedicated DC link rated at 300 VDC supplies the intermediate circuit, and this voltage must be present from the machine’s shared supply module before the unit can release its ready signal. Thermal management relies on a separate 220 V AC, 50–60 Hz blower supply, so cooling can continue even when the DC bus is de-energized. The unit uses forced cooling, which keeps semiconductor junction temperatures below their maximum operating limit during sustained high load. Speed references arrive through a 16-bit digital parallel interface, giving the controller fine resolution when programming spindle surface speeds and thread pitches.

The drive can be installed at ambient temperatures between 5 °C and 45 °C without derating, and it is suitable for sites up to 1000 m above sea level where reduced air density still permits adequate fan cooling. For data exchange beyond the main command bus, a serial interface (RS-232 C) is available for parameter uploads and diagnostics. A mounted heat sink blower on the rear panel provides the required airflow and helps simplify cabinet layout. The unit is part of series 3.