KDA 2.1-050-3-A0S-U1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 2.1-050-3-A0S-U1 is part of the KDA Spindle Drives series and is rated for 50 Amps with a 300 VDC supply voltage. It uses a mounted heatsink blower for forced cooling and operates within an ambient temperature range of 5 to 45 degrees Celsius. The drive includes a serial interface (RS 232 C) and accepts analog speed command values.
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Product Description:
The KDA 2.1-050-3-A0S-U1 is a spindle drive produced by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. It serves as the power stage between a CNC controller and a synchronous or asynchronous spindle motor, regulating torque and speed during machining operations. Designed for industrial automation, the unit receives its control commands from higher-level controllers and converts them into precisely metered armature current for the connected spindle. This operating role lets the drive support cutting processes that depend on smooth acceleration, steady rotation, and repeatable spindle behavior as load changes through a cycle. In spindle applications, that helps the machine maintain commanded speed during tool engagement and other rapid load changes.
It draws its DC link energy from a regulated bus at 300 VDC, and the power section can deliver a continuous drive current of 50 A to the motor. Internal thermal management relies on a mounted heat sink blower that is supplied by an auxiliary line of 115 V/50-60 Hz; this fan forces ambient air through the aluminum fins to remove semiconductor heat. Parameter data and diagnostics are exchanged through the integrated serial interface (RS-232C). This connection supports local setup, status checks, and direct communication with external serial devices when basic point-to-point access is preferred. The drive maintains full performance when the surrounding air stays within 5 to 45 °C, and installation heights up to 1000 m above sea level do not require derating.
Speed reference signals reach the control board as an analog voltage, which supports retrofits where digital fieldbuses are not present. That is useful in older machine platforms where the control system already provides a conventional voltage command instead of a networked setpoint. The drive is released as series 2 hardware, placing it in the second product generation of this model line. It has no provision for a second encoder input, so spindle position feedback is taken solely from the primary tachometer channel. This arrangement keeps the feedback path limited to the standard source already connected to the spindle motor.
Frequently Asked Questions about KDA 2.1-050-3-A0S-U1:
Q: What is the rated current for the KDA 2.1-050-3-A0S-U1 spindle drive?
A: The KDA 2.1-050-3-A0S-U1 spindle drive operates with a rated current of 50 A.
Q: How is the KDA 2.1-050-3-A0S-U1 spindle drive cooled?
A: This drive uses a mounted heatsink blower for forced cooling.
Q: What is the permissible operating temperature range for the KDA 2.1-050-3-A0S-U1?
A: The ambient temperature range for operation is 5 to 45 degrees Celsius.
Q: What type of additional interface is available on the KDA 2.1-050-3-A0S-U1 spindle drive?
A: It comes with a serial interface (RS 232 C) as an additional connectivity option.
Q: What form of speed command input does the KDA 2.1-050-3-A0S-U1 support?
A: This spindle drive accepts an analogue speed command value.
