Product Description:

The KDA 3.1-150-3-LPS-W1 spindle drive is produced by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. The unit functions as the power converter between a central DC bus and a high-speed spindle, allowing precision speed control during drilling, milling, and grinding. Within an automation cell, it accepts digital speed references from the host controller and manages real-time current, voltage, and position feedback so the spindle follows programmed profiles.

The drive’s thermal management relies on a mounted heat sink blower that draws ambient air across the cooling fins. The fan is powered from an auxiliary supply of 220 V/50–60 Hz, so the blower runs independently of the main DC link. Airflow is directed through channels built into the heat sink, supporting forced cooling to keep internal semiconductors below their junction limits during continuous operation and repeated load changes. The converter is fed from a stabilized intermediate bus of 300 VDC, which it chops into a three-phase output sized for up to 150 A of motor current. A fiber-optic SERCOS interface carries the speed command value, ensuring jitter-free transmission and synchronous motion when multiple axes share the same real-time ring.

In addition to the main control bus, a serial interface (RS-232C) is provided for service access and parameter backup without interrupting fieldbus traffic. Operation is limited to an ambient range of 5 °C to 45 °C, so cabinet ventilation must be planned when the machine room approaches the upper limit. Installation is approved up to 1000 m above sea level; beyond that height, reduced air density can lower cooling performance and require derating. A secondary encoder socket allows spindle feedback or additional motor feedback channels, enabling precise positioning functions such as orientation locking or rigid tapping during controlled spindle operation.