KDA 3.1-150-3-LQI-U1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 3.1-150-3-LQI-U1 is a spindle drive from the KDA Spindle Drives series with a rated current of 150 Amps and a 300 VDC supply voltage. It uses forced cooling via a mounted heatsink blower powered by a 115V AC source and features an incremental encoder output with a SERCOS speed command interface. This drive operates within an ambient temperature range of 5 to 45 degrees Celsius and supports installation up to 1000 meters above sea level.
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Product Description:
The KDA 3.1-150-3-LQI-U1 spindle drive is manufactured by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. Within an automation cell, it functions as the regulated power stage that links the machine controller to a high-speed spindle motor, shaping the torque and speed profile required for milling, drilling, or grinding operations. By drawing energy from a common DC bus and modulating three-phase output, the unit lets CNC systems execute rapid tool changes and maintain dimensional accuracy during continuous production. This arrangement supports stable spindle control during speed changes and helps the machine respond quickly to varying cutting loads during machining.
This drive is powered from a DC link of 300 VDC, and its inverter section is rated for a continuous output of 150 A, allowing it to handle high peak currents seen during aggressive acceleration or deceleration of large tool holders. Setpoint data enter the controller over the deterministic SERCOS interface, so spindle speed commands are synchronized with axis movements and feed overrides. Thermal management is handled by a heat sink fan supplied with 115 V at 50–60 Hz; the airflow path uses forced cooling to keep semiconductor junction temperatures within limits even at full current. This cooling method supports continuous operation in cabinets where spindle demand changes rapidly during machining cycles.
Installation constraints include an ambient operating range of 5 to 45 °C and a maximum mounting height of 1000 m above sea level, helping the drive maintain normal cooling performance and insulation reliability. These limits are intended for typical industrial locations where air density and cabinet temperature affect spindle-drive operation. Feedback provisioning is simplified by the built-in incremental encoder output, which can forward spindle position signals directly to supervisory controls. The cooling assembly uses a mounted heat sink blower, so no external ducting is required and nearby cabinet components can be arranged with standard service clearances.
Frequently Asked Questions about KDA 3.1-150-3-LQI-U1:
Q: What cooling system is used in the KDA 3.1-150-3-LQI-U1 spindle drive?
A: The KDA 3.1-150-3-LQI-U1 spindle drive uses a mounted heatsink blower for cooling.
Q: What is the rated current of the KDA 3.1-150-3-LQI-U1 spindle drive?
A: Its rated current is 150 A, supporting high-current spindle applications.
Q: What DC supply voltage does the KDA 3.1-150-3-LQI-U1 require?
A: This model requires a 300 VDC supply for operation.
Q: Which interface is used for speed command input on the KDA 3.1-150-3-LQI-U1?
A: The speed command input for the KDA 3.1-150-3-LQI-U1 is via the SERCOS interface.
Q: What is the permissible ambient temperature range for the KDA 3.1-150-3-LQI-U1 spindle drive?
A: The spindle drive can operate in ambient temperatures from 5 to 45 degrees Celsius.
