KDA 3.3-150-3-A0D-U1 Bosch Rexroth Indramat
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MPN: R911269442
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The Bosch Rexroth Indramat KDA 3.3-150-3-A0D-U1 is a spindle drive from the KDA Spindle Drives series and supports a rated current of 150 Amps with a DC supply voltage of 300 Volts. It uses a forced cooling system through a mounted heatsink blower that operates on a 115V AC source at 50-60Hz. The spindle drive is designed for use in ambient temperatures from 5 to 45 degrees Celsius and at elevations up to 1000 meters above sea level.
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Product Description:
The KDA 3.3-150-3-A0D-U1 is a transistorized spindle drive produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. Within a multi-axis automation cabinet, this unit links the shared DC bus of an Indramat supply module to a high-speed spindle motor, controlling acceleration, constant-speed cutting, and rapid deceleration cycles. Its control loop closes through the drive encoder channel of the associated motor, allowing precise surface finishes and stable speed regulation during milling, drilling, and grinding operations. This operating role makes it suitable for machine tools that require repeatable spindle response during changing load conditions.
Internally, the drive is energized from a 300 VDC link, and it can deliver a continuous armature current of 150 A to match medium-frame asynchronous spindle motors. Thermal energy generated by the power electronics is removed through a mounted heat sink blower, and the airflow is powered by the drive’s 115 V/50–60 Hz auxiliary supply. This arrangement uses forced cooling to maintain semiconductor junction temperatures during long rough-cut passes. Motion commands arrive as an analog speed command value, so the numerical controller modulates spindle speed with a ±10 V reference while the drive filters this input and produces proportional three-phase output frequency and voltage.
The permissible operating climate ranges from 5 to 45 °C, allowing installation next to other power converters without additional conditioning. Installation height is limited to 1000 m above sea level because reduced air density lowers cooling effectiveness. For position-synchronized tapping or thread cutting, the drive accepts a digital position command value over its control interface, yet it has no second encoder input, so spindle orientation feedback uses the primary channel. The unit is part of Series 3.
Frequently Asked Questions about KDA 3.3-150-3-A0D-U1:
Q: What is the permitted operating temperature range for the KDA 3.3-150-3-A0D-U1 spindle drive?
A: The KDA 3.3-150-3-A0D-U1 spindle drive can operate in ambient temperatures ranging from 5 to 45 degrees Celsius.
Q: What is the rated current of the KDA 3.3-150-3-A0D-U1 spindle drive?
A: This spindle drive supports a rated current of 150 A for its operations.
Q: How does the KDA 3.3-150-3-A0D-U1 spindle drive achieve cooling?
A: The KDA 3.3-150-3-A0D-U1 features a forced cooling method using a mounted heatsink blower.
Q: What AC source is required for the heatsink blower in the KDA 3.3-150-3-A0D-U1?
A: It accepts an AC source of 115V at 50-60Hz specifically for powering the heatsink blower.
Q: What is the maximum installation elevation for the KDA 3.3-150-3-A0D-U1 spindle drive?
A: The drive allows for installation at elevations up to 1000 meters above sea level.
