Product Description:

Bosch Rexroth Indramat manufactures the KDA 2.1-100-3-LPS-U1 as part of the KDA Spindle Drives series. This unit is a spindle drive that supplies controlled three-phase power to high-speed machine tool spindles, allowing closed-loop speed and position regulation in automated production cells. Version 2 electronics inside the drive connect it directly to Indramat motion controllers, forming a self-contained module that converts a fixed DC bus into regulated AC output for dynamic spindle acceleration and braking.

For power conversion, the drive receives a bus of 300 VDC and can deliver a continuous motor phase current of 100 A, so inverter components and cable sizing must support that load. Thermal management is handled by a mounted heat sink blower; the impeller operates on 115 V/50-60 Hz from an auxiliary mains tap, and the airflow provides forced cooling to keep semiconductor junction temperatures within limits during rapid spindle duty cycles. A dedicated diagnostic connector provides an RS-232-C serial link, enabling parameter adjustment and fault logging from a host PC without interfering with real-time motion commands.

System designers can install the drive in workshops ranging from 5 to 45 °C ambient, and performance remains stable up to 1000 m above sea level without derating. Speed references enter through a fiber-optic SERCOS interface, giving deterministic update rates that match Indramat multi-axis controllers. For applications that require exact spindle orientation or an additional position loop, the front panel includes a second encoder input that can accept resolver, TTL, or inductive feedback signals. The drive is suitable for machining centers, grinders, and turning stations that require precise spindle control across varied mounting conditions.