Product Description:

The DMA 045A 7301-D servo drive module is produced by Bosch Rexroth Indramat and belongs to the DMA Servo Drive Modules series. As a three-phase power stage for synchronous and asynchronous motors, it converts the common DC link voltage in a multi-axis cabinet into controlled stator currents, letting the higher-level controller regulate speed and torque in automated machinery. Installed on the RMA/DM 45 backplane, it uses guided air cooling through the chassis, making it suitable for tightly packed production lines.

The housing occupies a width of 100 mm, so several modules fit standard rack spacing, and the overall mass of 11.5 kg keeps cabinet load moderate. Internally, the DC link is maintained at 670 VDC when a regulated supply is present and can rise to 715 VDC when the source is not regulated. This voltage feeds the IGBT bridge, which delivers a rated phase current of 15 A rms at a closed-loop switching frequency of 8 kHz. For short open-loop bursts, the current can climb to 51 A rms, providing headroom for acceleration peaks. Two axial fans draw air across the heat sink, and the cooling path is guided by the backplane channels. Drive feedback comes from a resolver interface, while the logic bus uses the CANrho protocol routed through the same carrier board.

Control wiring requires a 24 V logic feed of 1.32 A, and communications can be clocked up to 1000 kBaud on the CAN segment so the module can share status with neighboring axes. Four opto-isolated digital inputs, identified here as 4, allow the machine controller to pass enable or inhibit commands without a separate I/O block. Continuous conduction produces about 220 W of power loss that must be removed by cabinet airflow. The unit relies on the host drive for axis control rather than an internal positioning function, and resolver feedback is sampled at 12-bit resolution to support velocity and torque loops executed in the central motion controller.