Product Description:

The DMA 008A 4101-D is a servo drive module built by Bosch Rexroth Indramat within the DMA Servo Drive Modules series. Designed as a three-phase unit for synchronous and asynchronous motors, it converts the DC-link energy of a shared supply into controlled phase currents that run a single machine axis. The module pairs with an RMA/DM 8 backplane inside multi-axis racks and relies on air cooling through the cabinet backplane, so no dedicated fan is required. In automated lines, it provides current-mode control and position loops for packaging, handling, and other motion tasks.

Its power stage operates from an unregulated DC link of 715 VDC, while an internal chopper maintains a regulated level of 670 VDC for the output transistors. With a 4 kHz switching frequency, the continuous phase current reaches 5.7 Arms; at 8 kHz, the rating falls to 3.3 Arms because of higher switching losses. The output current is reduced by 0.15 A per kelvin when ambient temperature rises from 45 °C to 55 °C. Cooling air drawn across the backplane removes heat, and the maximum power loss is 97.7 W. The aluminum housing is 50 mm wide and weighs 7.3 kg, allowing dense side-by-side mounting in standard control cabinets.

The control section runs on a 24 VDC service supply that draws 1.14 A for logic and relay circuits. Command values enter through an analog interface with 16-bit resolution, and the standard encoder port accepts incremental or absolute feedback. Position data are handled with single-turn accuracy of 20 bits and multi-turn depth of 32 bits, enabling precise one-axis positioning without external counters. The module includes the Additional Functions package for one-axis positioning, letting it close loops internally. All control signals share a ground referenced to the backplane to minimize wiring.