KDA 3.1-050-3-AP0-U1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 3.1-050-3-AP0-U1 is part of the KDA Spindle Drives series and is designed as a spindle drive with a rated current of 50 Amps and a DC supply voltage of 300 VDC. It features forced cooling using a mounted heatsink blower powered by a 115V AC source, and supports operation in ambient temperatures from 5 to 45 degrees Celsius up to 1000 meters above sea level.
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Product Description:
The KDA 3.1-050-3-AP0-U1 is a spindle drive manufactured by Bosch Rexroth Indramat within the KDA Spindle Drives series. It forms the power stage between the common bus supply and the three-phase windings of a machine-tool spindle motor, modulating current in real time so cutting speed follows the command profile from the CNC. Its embedded diagnostic logic and dedicated feedback connector help the controller maintain tight velocity and position loops during turning, milling, or grinding cycles where stable spindle speed affects surface finish and process consistency. This operating role makes the unit suitable for spindle applications that must react quickly to load changes during metal-cutting processes.
The power section operates from a DC link rated at 300 VDC and can deliver a continuous line current of 50 A to the motor windings. Thermal energy is removed by a heat sink-mounted blower, and the fan is supplied from an external 115 V/50-60 Hz single-phase source rather than depending only on cabinet airflow. Safe operation is specified for an ambient range of 5 to 45 °C, allowing installation in temperature-controlled shop floors without additional conditioning equipment. By removing heat directly at the sink, the blower helps the power section maintain stable performance during sustained spindle operation.
Mechanical installation is permitted up to 1000 m above sea level; above that elevation, output must be derated to account for lower air density. The unit uses forced cooling, so airflow through the fins must be maintained whenever the power stage is energized. Commanded velocity arrives as an analog value, and a second encoder socket supports additional spindle or motor feedback for synchronized tapping or dual-loop control. The drive is Series 3, and the housing does not accept extra interface boards.
Frequently Asked Questions about KDA 3.1-050-3-AP0-U1:
Q: What is the rated current for the KDA 3.1-050-3-AP0-U1 spindle drive?
A: The KDA 3.1-050-3-AP0-U1 spindle drive operates with a rated current of 50 A.
Q: What type of cooling system is used on the KDA 3.1-050-3-AP0-U1?
A: This model uses a mounted heatsink blower and forced cooling for thermal management.
Q: Which AC voltage and frequency does the heatsink blower on this spindle drive need?
A: The AC source required for the heatsink blower is 115V at 50-60Hz.
Q: What is the highest elevation at which the KDA 3.1-050-3-AP0-U1 can be installed?
A: The maximum installation elevation for this unit is 1000 meters above sea level.
Q: What is the permissible ambient temperature range for operating the KDA 3.1-050-3-AP0-U1?
A: The ambient operating temperature range for this model is 5 to 45 degrees Celsius.
