KDA 3.3-050-3-DPD-U1 Bosch Rexroth Indramat
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MPN: R911283745
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The Bosch Rexroth Indramat KDA 3.3-050-3-DPD-U1 is a spindle drive from the KDA Spindle Drives series, designed with a rated current of 50 Amps and a DC supply voltage of 300 Volts. It uses forced cooling with a mounted heatsink blower powered by a 115V AC source, and operates within an ambient temperature range of 5 to 45 degrees Celsius. The drive features digital speed and position command value interfaces, along with a second encoder input for spindle or motor feedback.
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Product Description:
The KDA 3.3-050-3-DPD-U1 is a spindle drive manufactured by Bosch Rexroth Indramat within the KDA Spindle Drives series. It functions as the power stage between a CNC controller and a high-speed spindle motor, transforming DC-bus energy into three-phase output under digital commands so machining centers and similar automation equipment can regulate rotational speed with closed-loop precision. This arrangement allows accurate speed control during drilling, milling, and other spindle-driven processes. Because the inverter stage is dedicated to spindle service, it supports the rapid acceleration and deceleration behavior often required in metalworking equipment.
The drive connects to a DC bus at 300 VDC and supplies up to 50 A of continuous output current to the spindle windings. Its heatsink blower is powered from an auxiliary line rated at 115 V/50-60 Hz. The cooling assembly uses a mounted heatsink blower and operates with forced cooling to keep semiconductor temperatures within limits. Continuous duty is permitted at ambient temperatures from 5 to 45 °C, while higher temperatures require derating or external conditioning. Installation is permitted up to 1000 m above sea level without performance loss, and the chassis uses an aluminum heatsink, temperature sensors, and airflow monitoring to support stable thermal operation. This cooling method reduces the risk of thermal limiting during extended spindle operation at sustained load.
For axis coordination, the unit accepts a digital position command value channel and a separate 16-bit digital parallel signal for the speed reference, allowing the controller to issue incremental or absolute targets with low latency. A second encoder input enables simultaneous processing of spindle feedback and an additional motor or resolver. This supports applications that need synchronized feedback paths for spindle control and related machine functions. Separate command and feedback paths also help the controller coordinate spindle behavior with the motion of feed axes. The control interfaces help the drive maintain coordinated motion when the machine shifts between speed changes, orientation moves, or position-dependent spindle tasks.
Frequently Asked Questions about KDA 3.3-050-3-DPD-U1:
Q: What type of cooling system is used in the KDA 3.3-050-3-DPD-U1 spindle drive?
A: The KDA 3.3-050-3-DPD-U1 uses a forced cooling system with a mounted heatsink blower to manage heat.
Q: What is the rated current of the KDA 3.3-050-3-DPD-U1 spindle drive?
A: This spindle drive operates with a rated current of 50 A, enabling high-performance spindle applications.
Q: What AC power source is necessary for the heatsink blower on the KDA 3.3-050-3-DPD-U1?
A: The KDA 3.3-050-3-DPD-U1 requires a 115V, 50-60Hz AC power source for the heatsink blower.
Q: What speed command input does the KDA 3.3-050-3-DPD-U1 support?
A: This spindle drive supports a digital speed command value input with 16-bit parallel transmission.
Q: What is the permissible ambient temperature range for operating the KDA 3.3-050-3-DPD-U1?
A: It is suitable for operation within an ambient temperature range of 5 to 45 degrees Celsius.
