Product Description:

The DMA 140D 3301-D is a drive module built by Bosch Rexroth Indramat within the DMA Servo Drive Modules series. It is a three-phase module intended for synchronous and asynchronous motors, providing regulated DC link power and current shaping for motion axes in automated machinery. By converting a shared DC bus into controlled phase currents, the unit forms the core of high-performance position and speed loops in industrial automation cells. The shared bus arrangement also supports coordinated motor control across compact multi-axis systems.

The drive’s logic circuitry is energized from a 24 V control supply with a current draw of 1.58 A, isolating the control electronics from the power stage during mains outages. The switching devices operate at a frequency of 8 kHz, so thermal and acoustic performance are balanced. When the carrier is kept at this rate, the module can deliver 84 Arms continuously, and short bursts can reach 117 Arms. A DC link of 670 V in regulated operation or 715 V in non-regulated operation feeds the inverter bridge, influencing motor back-EMF and regeneration limits. Overall heat dissipation is capped at 700 W, a value that guides cabinet ventilation sizing.

At the lower 4 kHz carrier rate, the continuous current rating climbs to 106 Arms, while overload peaks of 141 Arms are available for brief periods. Above 45 °C, the output is reduced by 1.75 A per kelvin to protect the semiconductors, and this linear derating continues to the 55 °C limit. Internal losses are removed by backplane air cooling, so the rear heat sink connects to cabinet airflow and no front-mounted fans are required. The module stands 521 mm high, 200 mm wide, and weighs 19.3 kg, which supports dense installations. Motion feedback is accepted through a resolver interface, and command values arrive on an analog setpoint channel. The final interpolated position has a resolution of 12 bits, which is suitable for coarse positioning stages.