KDA 3.1-050-3-LPD-U1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 3.1-050-3-LPD-U1 is a spindle drive in the KDA Spindle Drives series with a rated current of 50 Amps and a DC supply voltage of 300 VDC. It features forced cooling by a mounted heatsink blower with a 115V AC source, and supports position command input digitally. An additional encoder input is available for spindle or motor feedback, and it operates in ambient temperatures from 5 to 45 degrees Celsius up to 1000 meters elevation.
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Product Description:
The KDA 3.1-050-3-LPD-U1 spindle drive is produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. It functions as the active interface between the machine control and a synchronous or induction spindle motor, converting DC bus energy into three-phase output while monitoring speed feedback. Version 3 within the series incorporates integrated logic and communication paths so the cabinet can be laid out with reduced depth and shorter cable runs. In automated machining centers, the unit governs spindle acceleration, deceleration, and steady-state rotation to help maintain surface finish and tool life.
Electrical power is supplied to the control section by a bus link rated at 300 VDC; this voltage supplies the internal DC intermediate circuit from which the inverter stage produces variable-frequency output. The drive can deliver a continuous phase current of 50 A, giving it the capacity to run medium-frame spindles without derating during heavy cuts. A dedicated heat sink blower draws its energy from a single-phase 115 V/50-60 Hz source, ensuring that semiconductor junction temperatures remain within safe limits. Real-time velocity commands are entered over the SERCOS interface, allowing closed-loop coordination with multi-axis controllers. Reliable operation is specified for ambient temperatures from 5 to 45 °C, so no additional conditioning is needed inside a normal shop-floor cabinet.
For diagnostic and process-control tasks, the drive includes a digital position command value channel, eliminating offset errors associated with analog scaling. Thermal management relies on a mounted heat sink blower working in forced cooling mode so the power stack stays within its design temperature even during prolonged high-speed cuts. Installation is supported up to 1000 m above sea level, after which output current derating is recommended to accommodate thinner air. A second encoder terminal can be configured for spindle feedback or auxiliary motor feedback, which adds flexibility in closed-loop spindle applications.
Frequently Asked Questions about KDA 3.1-050-3-LPD-U1:
Q: How is the KDA 3.1-050-3-LPD-U1 spindle drive cooled?
A: The KDA 3.1-050-3-LPD-U1 spindle drive is cooled by a mounted heatsink blower with forced air cooling.
Q: What is the rated current for the KDA 3.1-050-3-LPD-U1 spindle drive?
A: This drive operates with a rated current of 50 A, supporting demanding spindle motor loads.
Q: What DC supply voltage is required for the KDA 3.1-050-3-LPD-U1?
A: The DC supply voltage for this model is 300 VDC, allowing compatibility with suitable industrial power supplies.
Q: What interface is used for speed command values on this spindle drive?
A: The speed command value on the KDA 3.1-050-3-LPD-U1 is provided using a SERCOS Interface.
Q: What is the highest installation elevation supported by the KDA 3.1-050-3-LPD-U1?
A: This drive supports a maximum installation elevation of 1000 meters above sea level.
