Product Description:

The DMA 140D 7301-D drive module is produced by Bosch Rexroth Indramat within the DMA Servo Drive Modules series. As a three-phase unit for synchronous and asynchronous motors, it converts DC-link energy into controlled motor currents for positioning, velocity, and torque regulation in automated machinery. Motion commands arrive through the CANrho setpoint interface, allowing coordinated control with other Indramat modules. This format suits compact multi-axis racks where several motor functions share a common DC link.

This module draws 1.58 A from the 24 V control supply to power its logic, cooling fans, and safety circuits. It plugs into an RMD/DM backplane, and the air-cooling path draws heat through that backplane with help from two integrated fans. Under a 4 kHz switching frequency, the current limit reaches 141 Arms on the first channel and 106 Arms on the second, while the rated continuous values are 42 Arms and 87 Arms; at 8 kHz, the maxima change to 117 Arms and 84 Arms with continuous ratings of 25 Arms and 60 Arms. The shared DC link operates at 670 VDC when regulated and can rise to 715 VDC in unregulated operation, resulting in a worst-case power dissipation of 700 W that the cooling system must remove.

For continuous service, the thermal derating coefficients are 2.25 A/K at 4 kHz and 1.75 A/K at 8 kHz, so adequate airflow is required when ambient temperatures exceed 45 °C. Motor feedback is accepted through a resolver interface that offers 12 bits of angular resolution, giving the drive sufficient accuracy for medium-precision axes. The module has a width of 200 mm and a mass of 19.3 kg, which influence rack spacing and handling during installation. This resolver-based feedback method suits applications that need stable closed-loop speed and position control without relying on a higher-resolution encoder.