Product Description:

The DMA 045A 3301-D is a three-phase servo drive module produced by Bosch Rexroth Indramat within the DMA Servo Drive Modules series. Designed for backplane installation, the unit supplies controlled power to synchronous and asynchronous motors used in positioning axes, conveyors, and machining centers. Integrated analog setpoint handling and resolver feedback support closed-loop torque and speed regulation, making the module a central element in multi-axis automation racks.

The control electronics draw 1.32 A from the mandatory 24 V auxiliary bus, which affects cabinet power-supply sizing. When the switching frequency is limited to 2 kHz, the power stage can deliver up to 45 A of motor current, enabling acceleration of medium-inertia loads. At the higher 4 kHz carrier, the continuous line current is rated at 23 Arms, while operation at 8 kHz lowers the rating to 15 Arms; these values reflect the thermal limits imposed by faster switching. Additional temperature-based derating applies at elevated ambient conditions, decreasing output by 0.65 A/K above the reference point for 4 kHz operation. The module dissipates a maximum of 220 W as heat, so ventilation and heat-sink capacity must match this loss to avoid thermal shutdown.

Ambient load reduction is more pronounced at 8 kHz, where the current falls by 0.45 A/K. The drive is cooled by air drawn across a backplane heat exchanger, and two fans mounted in the rack maintain the required flow. With a mass of 7.3 kg and a compact width of 50 mm, the unit occupies one slot beside the RMA/DM 45 backplane module that supplies DC link and logic interconnects. Resolver feedback is accepted through a dedicated interface with 12-bit angular resolution, and motion commands enter through a 12-bit analog setpoint channel, allowing precise reference scaling without external converters. The mechanical design follows standardized backplane mechanics and fits the associated rack layout.