KDA 3.3-150-3-L00-U1 Bosch Rexroth Indramat
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MPN: R911266809
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The Bosch Rexroth Indramat KDA 3.3-150-3-L00-U1 is a spindle drive from the KDA Spindle Drives series with a rated current of 150 Amps and a DC supply voltage of 300 Volts. This model uses forced cooling with a mounted heatsink blower powered by a 115V 50-60Hz AC source, and is suitable for ambient temperatures from 5 to 45 degrees Celsius.
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Product Description:
The KDA 3.3-150-3-L00-U1 spindle drive is produced by Bosch Rexroth Indramat as a member of the KDA Spindle Drives series. It is installed in machine-tool control cabinets where it converts shared DC-link energy into precisely regulated three-phase output for high-speed spindles. In these systems, the drive serves as the power stage between the cabinet DC link and the spindle motor while responding to motion commands from the machine control. By coordinating acceleration, braking, and holding functions, the drive supports automated milling, drilling, and grinding stations while allowing the numerical control to maintain consistent cutting speeds under changing load conditions.
Its DC bus connection is rated at 300 VDC, meaning the drive draws stabilized direct current from the cabinet supply rather than rectifying its own mains input. The current loop can deliver up to 150 A, supplying the surge capability required for rapid spindle ramp-up and heavy chip-removal cuts. Heat generated by the IGBT stack is removed by a mounted heat sink blower. This fan assembly is built onto the rear plate and forces air across the aluminum fins through forced cooling. The blower itself operates from an auxiliary supply of 115 V at 50/60 Hz, so the installation must provide a protected single-phase branch circuit. Because there is no second encoder input, feedback is limited to the primary motor encoder, and the enclosure does not include an additional interface option.
The command channel is handled through a SERCOS interface, which transmits digital speed setpoints directly from the CNC. This communication method supports the fast exchange of motion data needed for accurate spindle speed regulation in machine tools. Reliable operation is specified within an ambient range of 5 to 45 °C; outside this window, the drive may derate to protect semiconductor junctions. Installation altitude is permitted up to 1000 m above sea level before additional cooling or voltage correction is required. Classified as version 3, the unit does not include auxiliary protocol boards, which keeps the control path focused on the standard communication configuration.
Frequently Asked Questions about KDA 3.3-150-3-L00-U1:
Q: How is the KDA 3.3-150-3-L00-U1 spindle drive cooled?
A: The KDA 3.3-150-3-L00-U1 spindle drive supports forced cooling via a mounted heatsink blower.
Q: What is the rated current of the KDA 3.3-150-3-L00-U1 spindle drive?
A: This model operates with a rated current of 150 A, enabling it for high-power spindle applications.
Q: What is the required DC supply voltage for the KDA 3.3-150-3-L00-U1?
A: The drive requires a 300 VDC supply voltage for operation.
Q: What interface does the KDA 3.3-150-3-L00-U1 use for speed command values?
A: The KDA 3.3-150-3-L00-U1 accepts speed command values via the SERCOS interface.
Q: What is the maximum installation elevation for the KDA 3.3-150-3-L00-U1 spindle drive?
A: This unit is suitable for installation up to 1000 meters above sea level.
