Product Description:

The DMA 045A 7101-D is a three-phase power module produced by Bosch Rexroth Indramat in the DMA Servo Drive Modules series. Intended for synchronous and asynchronous motor operation, the unit installs on a common RMA/DM 45 backplane and exchanges motion commands through the CANrho interface. Within an automation cell, it supplies controlled DC-link energy and phase current to one axis, letting system designers build compact multi-drive stacks for material handling, packaging, or assembly lines.

At a 4 kHz switching frequency, the module delivers a continuous closed-loop output of 23 Arms. When higher torque is needed, the closed-loop peak rises to 39 Arms, and the open-loop surge reaches 51 Arms. Users selecting an 8 kHz carrier can draw an open-loop maximum of 44 Arms while maintaining a continuous supply of 15 Arms. These current limits set conductor sizing, thermal management, and protective hardware so that both the converter and the driven motor stay within safe temperature margins during acceleration, braking, or process transients.

The control section requires 1.32 A from the 24 V auxiliary bus, and internal switching elements dissipate up to 220 W; two fans mounted behind the backplane handle this heat through directed airflow. Incoming rectifiers charge a non-regulated DC link to 715 VDC, while downstream circuitry stabilizes a regulated link near 670 VDC for consistent motor voltage. Current capability decreases by 0.65 A per kelvin between 45 °C and 55 °C at 4 kHz, so cabinet cooling must be verified in warm environments. The 50 mm module width promotes dense stack layouts, and the 7.3 kg mass eases handling during maintenance. Although an additional function for one-axis positioning is available, embedded positioning control is not included, so higher-level controllers must generate motion profiles.