KDA 2.1-050-3-LQS-W1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 2.1-050-3-LQS-W1 is part of the KDA Spindle Drives series and is rated for a current of 50 Amps with a DC supply voltage of 300 VDC. This spindle drive uses a mounted heatsink blower for forced cooling and operates within an ambient temperature range of 5 to 45 degrees Celsius. It features a SERCOS interface for speed command and a serial interface RS 232 C for additional connectivity.
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Product Description:
The KDA 2.1-050-3-LQS-W1 spindle drive is produced by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. Within a multi-axis machining center, this drive converts a regulated DC bus into variable three-phase output for high-speed spindle motors, allowing CNC controllers to adjust torque and speed during cutting cycles. Its integrated power electronics and dedicated heat sink blower simplify cabinet layout while supporting closed-loop velocity control through the SERCOS channel. The closed-loop arrangement helps the spindle maintain stable speed when cutting forces change during drilling, milling, and contouring operations.
At the power stage, the drive is supplied from a DC bus of 300 VDC, and its semiconductors can deliver a continuous output of 50 A, allowing connection to medium-frame asynchronous or synchronous spindle motors. The heat sink blower that removes switching losses runs from an auxiliary supply of 220 V at 50–60 Hz. Air is pulled across the fins by a mounted heat sink blower, and the unit uses forced cooling to keep thermal loading under control during sustained machining duty. Separate blower power keeps cooling active without depending on the main spindle output stage. As a member of Series 2, the module uses the mechanical dimensions and connector pinouts associated with that KDA generation.
For service and diagnostics, the front panel carries an RS-232C serial interface, allowing local access without occupying the real-time motion bus. The electronics are intended for ambient conditions from 5 °C to 45 °C, and operation is permitted up to 1000 m above sea level. During runtime, the controller receives the velocity command through the SERCOS interface, which supports deterministic spindle synchronization with tool changers and linear axes. This all-digital command path helps prevent analog drift during speed-regulated operation. Local access through the front connection also keeps the motion network available for control traffic while diagnostic work is performed.
Frequently Asked Questions about KDA 2.1-050-3-LQS-W1:
Q: What type of cooling system does the KDA 2.1-050-3-LQS-W1 spindle drive feature?
A: The KDA 2.1-050-3-LQS-W1 spindle drive uses a mounted heatsink blower for cooling, supporting forced air operation.
Q: What is the recommended ambient temperature range for the KDA 2.1-050-3-LQS-W1?
A: This spindle drive is designed to operate in ambient temperatures from 5 to 45 degrees Celsius.
Q: What is the rated current capacity of the KDA 2.1-050-3-LQS-W1 spindle drive?
A: The KDA 2.1-050-3-LQS-W1 offers a rated current specification of 50 A.
Q: Which additional communication interface is available on the KDA 2.1-050-3-LQS-W1?
A: It is equipped with a serial RS 232 C interface for additional communications.
Q: What is the required DC supply voltage for the KDA 2.1-050-3-LQS-W1 spindle drive?
A: The drive accepts a DC supply voltage of 300 VDC for its operation.
