Product Description:

The KDA 3.1-100-3-LQS-U1 is a drive module manufactured by Bosch Rexroth Indramat for the KDA Spindle Drives series. It fits into a common DC bus system and supplies controlled three-phase power to machine-tool spindles, allowing coordinated speed and torque control during milling, drilling, or grinding cycles. By managing motor energy and heat through an integrated blower, the unit supports continuous duty in automated production lines where spindle acceleration and deceleration must match programmed feed motions. This arrangement helps the spindle respond consistently during changing cutting loads. It is intended for installations where the spindle drive must operate as part of a coordinated motion system rather than as a standalone power stage.

An external source rated at 115 V at 50/60 Hz powers the heatsink fan, so the cooling circuit remains active even when the DC bus is de-energized. The fan is fixed directly to a mounted heatsink blower, and the air path uses forced cooling to keep semiconductor temperatures within safe limits under full electrical load. The internal converter expects a bus of 300 VDC and can deliver a continuous spindle phase current of 100 A, making it suitable for high-power cutting heads. Speed commands arrive over the digital SERCOS interface, which transmits setpoints and diagnostic data in real time to synchronize spindle behavior with axis drives and related machine functions.

The drive maintains rated performance between 5 to 45 °C and may be mounted at locations up to 1000 m above sea level without derating. A serial interface (RS-232-C) is available beside the fieldbus connector for local parameter access and diagnostics when direct communication is needed. This separate port allows status checks and parameter entry without relying on the real-time motion network. The stated operating limits suit enclosed electrical cabinets where stable airflow and predictable ambient conditions are maintained.