KDA 2.1-050-3-L0S-W1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 2.1-050-3-L0S-W1 spindle drive is part of the KDA Spindle Drives series. It operates at a rated current of 50 Amps with a DC supply voltage of 300 VDC and uses forced cooling with a mounted heatsink blower. The drive features an RS 232 C serial interface and accepts speed command values through a SERCOS interface.
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Product Description:
Bosch Rexroth Indramat manufactures the KDA 2.1-050-3-L0S-W1 spindle drive as part of the KDA Spindle Drives series. The unit is intended for closed-loop speed and torque regulation of main spindle motors in machining centers, grinders, and similar equipment. By converting shared DC bus energy into a controllable three-phase output, it lets the machine control unit vary spindle speed in real time while maintaining stable torque and accuracy under changing loads. This helps the spindle respond consistently during acceleration, cutting, and changing process conditions.
The drive operates from a DC bus of 300 VDC, and its power stage can supply up to 50 A of continuous current to the spindle motor. Cooling air for the heat sink blower is powered by a separate 220 V/50–60 Hz source, which helps keep semiconductor junction temperatures within a safe operating range during sustained high-speed runs. Internal logic receives the speed command through the digital SERCOS interface, allowing deterministic data exchange with modern CNC controllers. Heat removal is supported by forced cooling, so rated current can be delivered during extended duty cycles without unnecessary thermal reduction.
A mounted heat sink blower is attached directly to the rear plate, simplifying cabinet airflow planning while directing air across the power module fins. This arrangement keeps airflow focused on the power section instead of relying only on general cabinet circulation. The permitted ambient range is 5 to 45 °C, and the installation altitude is limited to 1000 m above sea level. For setup and diagnostics, the auxiliary serial interface (RS-232 C) provides parameter access when a fieldbus connection is not yet available. The hardware does not include a second-encoder input, so feedback redundancy must be handled by the machine controller if needed.
Frequently Asked Questions about KDA 2.1-050-3-L0S-W1:
Q: What is the rated current for the KDA 2.1-050-3-L0S-W1 spindle drive?
A: This drive operates with a rated current of 50 A.
Q: What cooling method does the KDA 2.1-050-3-L0S-W1 spindle drive use?
A: It is equipped with a mounted heatsink blower for forced cooling.
Q: Which interface is used for speed command input on the KDA 2.1-050-3-L0S-W1?
A: The drive supports speed command input through the SERCOS interface.
Q: What is the required DC supply voltage for the KDA 2.1-050-3-L0S-W1 spindle drive?
A: The DC supply voltage for this drive is 300 VDC.
Q: Does the KDA 2.1-050-3-L0S-W1 spindle drive support a second encoder input?
A: This model does not feature a second encoder input.
