KDA 3.3-150-3-D0D-W1 Bosch Rexroth Indramat
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MPN: R911291573
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The Bosch Rexroth Indramat KDA 3.3-150-3-D0D-W1 is part of the KDA Spindle Drives series and is rated for a current of 150 Amps with a DC supply voltage of 300 VDC. This spindle drive uses a mounted heatsink blower with forced cooling and is designed to operate in ambient temperatures from 5 to 45 degrees Celsius. It supports digital position and speed command values and functions at elevations up to 1000 meters above sea level.
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Product Description:
The KDA 3.3-150-3-D0D-W1 is a spindle drive produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. Acting as a regulated power stage, it governs torque and rotational speed for motorized spindles in CNC machining centers and other automated cutting equipment. By transforming a shared DC bus into a controlled three-phase output, the drive connects numerical controllers to the electromechanical spindle so programmed feed rates and surface finishes can be achieved consistently. This arrangement supports stable spindle response during speed changes, tapping cycles, and contouring operations where the motor must follow changing load conditions without losing control accuracy.
Internally, the power section operates from a DC link of 300 VDC, so upstream supply modules must sustain that level for stable modulation. During continuous duty, the unit can deliver a phase current of 150 A, giving sufficient headroom for rapid acceleration of large spindle rotor assemblies. Thermal energy from the IGBT stack is expelled by a mounted heat sink blower, and the airflow method is forced cooling, which helps maintain semiconductor temperature during extended cutting cycles. Velocity references arrive as a 16-bit parallel digital command, enabling the controller to issue finely resolved speed commands with deterministic timing. This control format is suited to machine platforms that require direct, fast communication between the CNC and the spindle power stage.
Environmental limits include an operating range of 5 to 45 °C, which protects electronic components from condensation and overheating. Installation altitude is restricted to 1000 m above sea level, because reduced air density at higher elevations can lower cooling effectiveness. The heat sink blower itself draws power from a dedicated 220 V, 50/60 Hz source, allowing the main DC bus to remain reserved for drive electronics. For applications that need synchronized motion, the architecture offers an additional channel with a digital position command value, so the numerical controller can transmit position-related spindle commands during coordinated machining. This is useful in processes where spindle behavior must stay aligned with axis movement instead of running only at a fixed commanded speed.
