Product Description:

The KDA 2.1-150-3-DYS-W1 drive is a spindle controller produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. It converts a fixed DC bus into variable three-phase power so that high-speed machine tool spindles can accelerate, decelerate, and hold constant velocity under load. By combining integrated power electronics with closed-loop feedback inputs, the product allows precise speed regulation in automated milling, drilling, and grinding cells where surface finish and cycle time depend on exact spindle motion.

Its power section accepts a DC bus of 300 VDC, enabling the inverter stage to deliver up to 150 A of continuous output current to the spindle motor. Speed references arrive as digital 16-bit parallel words, allowing the numerical control to assign exact target values without analog drift. Internally, the control card is version 2 and can evaluate both primary and secondary encoder signals, while the additional channel supports phase alignment through a second encoder input and a synchronous timing line. Thermal management uses forced cooling provided by a heat sink blower whose fan motor is powered by 220 V, 50/60 Hz mains, so airflow remains constant regardless of spindle duty.

Operation is permitted between 5 to 45 °C, a range that matches typical shop floor conditions without requiring cabinet chillers. Reliable performance is maintained up to 1000 m above sea level, where reduced air density is still adequate for the unit’s mounted heat sink blower to carry waste heat away from the IGBT stack. Parameter access and diagnostic messages can be streamed over the integrated serial RS-232-C interface, simplifying connection to legacy controllers or service laptops, while the synchronous input keeps positional data from the secondary encoder time-aligned with the drive’s velocity loop.