Product Description:

The DMA 045A 1301-D is a servo drive module produced by Bosch Rexroth Indramat within the DMA Servo Drive Modules series. As a 3-phase module for synchronous and asynchronous motors, it conditions AC mains power and delivers regulated current to machine actuators. The unit serves as a central power stage in multi-axis automation, linking the plant's DC bus to motor windings while sending feedback data to higher-level motion controllers. Designed for cabinet mounting, the module integrates with SERCOS motion networks and supports resolver feedback, enabling deterministic positioning tasks on packaging lines, material handling cells, and presses.

During operation, the control electronics draw 24 VDC at 1.32 A, which sets the required auxiliary power supply size. Heat is removed by backplane air cooling, so airflow behind the mounting rail must be maintained to keep internal components within limits. At a 4 kHz PWM carrier, the output stage derates by 0.65 A/K, meaning each 1 °C rise above nominal ambient reduces continuous current by that value, while the open-loop peak remains 51 Arms for brief torque bursts. Internal switching and bus capacitors dissipate up to 220 W under maximum load, a figure used for enclosure ventilation calculations. No additional functional options are installed.

The module is only 50 mm wide, permitting dense lineups of power sections on the same backplane. When connected to the shared supply, its unregulated DC link can reach 715 VDC, and an internal chopper limits the regulated bus to 670 VDC for stable energy distribution. In closed-loop mode at 4 kHz, it sustains 23 Arms, dropping to 15 Arms at 8 kHz where the slope of 0.45 A/K applies, while open-loop peaks at that higher frequency are capped at 44 Arms. Position data arrives through a 12-bit resolver and a standard encoder interface, while velocity and torque commands are exchanged over the SERCOS setpoint channel.