KDA 3.3-150-3-A0I-U1 Bosch Rexroth Indramat
Wake Industrial LLC is not an authorized distributor of this product.
Wake Industrial LLC is not an authorized distributor of this product.
MPN: R911266354
Ask for AvailabilityThe Bosch Rexroth Indramat KDA 3.3-150-3-A0I-U1 is a spindle drive from the KDA Spindle Drives series and features a rated current of 150 Amps. It operates on a 300 VDC supply voltage and uses forced cooling with a mounted heatsink blower. The drive supports an incremental encoder output and accepts speed command values in analogue form.
Internal Product Review
The KDA 3.3-150-3-A0I-U1 spindle drive from Bosch Rexroth Indramat features a rated current of 150 A and operates on a 300 VDC supply voltage, making it suitable for high-power spindle applications. Forced cooling via a mounted heatsink blower ensures reliable thermal management, even in demanding environments. This model stands out for its incremental encoder output and dependable performance in a wide ambient temperature range.
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Product Description:
The KDA 3.3-150-3-A0I-U1 belongs to the KDA Spindle Drives series produced by Bosch Rexroth Indramat. As a spindle drive, it converts DC bus power from a multi-axis system into controllable three-phase output for high-speed machining spindles, while an internal control section processes an analog velocity reference from the CNC. Its integrated heat sink blower and dedicated power terminals allow the unit to be mounted directly inside a cabinet without additional cooling ducts, which simplifies installation on automated milling or drilling centers.
The drive supplies a continuous output of 150 A, allowing large-frame spindle motors to reach rated torque during aggressive cutting cycles. This current is drawn from a shared DC link maintained at 300 VDC, so the unit must be paired with an Indramat power supply sized for that bus level. The heat sink fan uses an auxiliary supply of 115 V at 50/60 Hz, which keeps the cooling system active even when the drive section is disabled. Thermal energy from the IGBT modules is removed by a mounted heat sink blower, and the rear panel is formed to direct the forced-air path. Spindle speed is commanded through an analog reference channel, allowing the CNC to generate a precise ±10 V signal that maps linearly to spindle speed.
The module is rated for operation within specific environmental limits. An ambient range of 5 to 45 °C keeps semiconductor temperatures within the intended operating range, and reliable service is specified up to 1000 m above sea level before derating is required. Feedback routing is supported by an incremental encoder output that delivers differential square-wave signals to the control, while the lack of a second encoder input keeps wiring simpler for single-feedback spindles. The cooling method is forced cooling, so cabinet airflow must remain unobstructed for the blower to maintain the required heat transfer rate.
