KDA 2.1-100-3-LPI-W1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 2.1-100-3-LPI-W1 is a spindle drive from the KDA Spindle Drives series. It features a rated current of 100 Amps and utilizes forced cooling with a mounted heatsink blower, operating with a 220V AC source for the blower. The spindle drive supports SERCOS interface speed command values and includes an additional incremental encoder output and a second encoder input for spindle or motor feedback.
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Product Description:
The KDA 2.1-100-3-LPI-W1 is a spindle drive produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. It forms part of a closed-loop axis group in CNC machining centers, supplying regulated armature current to a main spindle motor while accepting digital velocity commands from the motion controller. Its role is to keep cutting speed stable during drilling, milling, or grinding so that surface finish and tool life meet process requirements. In this role, the drive regulates motor response to load changes that occur as cutting forces vary through the machining cycle. This makes it suitable for machine tools that require stable spindle behavior during changing feed rates and material engagement.
The power stage is energized from a regulated DC bus of 300 VDC and can deliver up to 100 A of continuous armature current to the spindle windings. A dedicated rear-mounted heat sink blower runs from an auxiliary supply of 220 V at 50/60 Hz, and this arrangement is described as a mounted heat sink blower. Air moves across the aluminum fins through forced cooling to keep semiconductor temperatures within operating limits during sustained high-speed cutting. Rear-panel blower placement directs airflow over the heat sink instead of relying only on cabinet air circulation. For motion feedback, the unit provides a second encoder input that can be wired either to a spindle position encoder or to an auxiliary motor encoder when the axis is used in a tandem configuration.
The drive operates at ambient temperatures from 5 to 45 degrees Celsius without derating and can be installed up to 1000 m above sea level. For diagnostics and feed-forward tasks, the drive offers an incremental encoder output that mirrors spindle position to downstream measuring equipment. The mirrored signal can also be used by external devices that need position data separate from the main control loop. Speed reference data reach the control electronics through the SERCOS interface, enabling deterministic updates on the shared fiber-optic ring. This communication path supports accurate speed changes and coordinated spindle positioning during machine operation.
Frequently Asked Questions about KDA 2.1-100-3-LPI-W1:
Q: What is the rated current for the KDA 2.1-100-3-LPI-W1 spindle drive?
A: The KDA 2.1-100-3-LPI-W1 operates with a rated current of 100 A, supporting high-powered spindle applications.
Q: How is the KDA 2.1-100-3-LPI-W1 spindle drive cooled?
A: This model uses a mounted heatsink blower with forced cooling to maintain optimal operating temperatures.
Q: What type of additional interface is available on the KDA 2.1-100-3-LPI-W1?
A: The KDA 2.1-100-3-LPI-W1 features an additional interface for incremental encoder output.
Q: What DC supply voltage is required for the KDA 2.1-100-3-LPI-W1?
A: A DC supply voltage of 300 VDC is required for the operation of this spindle drive.
Q: How is the speed command value provided to the KDA 2.1-100-3-LPI-W1?
A: The KDA 2.1-100-3-LPI-W1 supports speed command input via the SERCOS Interface.
