Product Description:

The KDA 3.1-050-3-DP0-U1 is a drive module produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. It regulates the speed and torque of high-performance machining spindles, linking CNC controllers to induction or synchronous motors through pulse-width-modulated power stages and integrated position feedback channels. By converting a fixed DC bus into variable three-phase output, the unit enables closed-loop spindle acceleration, deceleration, and precise speed holding for metal-cutting and forming centers.

This model operates from a DC bus of 300 VDC and can deliver a continuous output of 50 A to the connected motor windings. An auxiliary input rated at 115 V at 50/60 Hz powers the heat sink blower, keeping semiconductor junction temperatures within safe limits during peak load. The cooling hardware is a mounted heat sink blower, which directs airflow across the fin stack to maintain thermal stability even when the cabinet is sealed. Speed reference data reaches the control section through a parallel 16-bit port, while a dedicated connector accepts an optional second encoder for spindle orientation or secondary motor feedback tasks, allowing lathe C-axis positioning or tandem-drive phase alignment.

Heat is extracted by forced cooling, so ambient air must circulate freely around the exhaust path to avoid derating. The 16-bit interface transmits the set value as a 16-bit parallel digital word, eliminating D-to-A errors seen with analog references. Correct operation is specified between 5 to 45 °C, and beyond that range the protection logic may reduce current to prevent overtemperature. Installation altitude is limited to 1000 m above sea level to keep cooling air density within design assumptions. Because the drive is delivered with no additional interface option, fieldbus or SERCOS links must be implemented through separate gateway modules if required.