DMA 85B 7301-D

The Bosch Rexroth Indramat DMA 85B 7301-D drive module is a compact member of the DMA Servo Drive Modules series, designed as a high-performance three-phase inverter module. As part of the Servodyn-D system family, it supports both synchronous and asynchronous motors equipped with absolute length measuring systems or gear encoders. Key specifications include an Input Voltage of 670V, an Output Voltage of 400V, and a 24 VDC current input rating of 1.35 A. Its primary function is to deliver regulated power to Servodyn-D systems, enabling precise speed and torque control in industrial automation.

In its technical configuration, the DMA 85B 7301-D operates on a DC link voltage of 670 Volts DC for regulated operation and up to 715 Volts DC unregulated, ensuring flexibility in power handling. The module delivers a maximum continuous current of 85 A at a switching frequency of 4 kHz, with an overload rating of 86 A and a rated current of 22 A for transient conditions. It features air cooling, a maximum power loss of 380 W, and derating of 1.25 A per °C between 45 °C and 55 °C. Weighing 11.5 kg and measuring 100 mm in width by 521 mm in height, the module plugs directly into the Servodyn-D backplane for streamlined installation.

The DMA 85B 7301-D offers robust connectivity via a CANrho interface and a resolver encoder interface, supporting seamless integration with SF, SR, DU and other motor types. Rated to IP20, its housing protects internal electronics while enabling air-cooled operation in ambient temperatures from 41 °F to 113 °F (operating) and -13 °F to 158 °F (storage). The module’s integrated DC link connection and standardized form factor ensure compatibility with modular inverter architectures. Backed by a one-year warranty, it delivers reliable durability and efficient performance for demanding industrial applications, reducing maintenance intervals and enhancing system uptime.