Product Description:

The DMA 085B 9301-D servo drive module is produced by Bosch Rexroth Indramat within the DMA Servo Drive Modules series. This three-phase unit regulates current for synchronous and asynchronous motors and forms the power interface between the mains supply and motion axes in production equipment. Through its CANopen and CANrho channels it receives setpoints from a higher-level controller, conditions the DC link, and delivers phase-aligned output that matches load demand. Integrated resolver feedback lets it close torque loops for positioning, conveyor, and packaging stations.

Beneath the power terminals, the module maintains a nonregulated DC link of 715 VDC. An internal regulator trims this value to 670 VDC to supply the IGBT bridge. When the current loop is sampled at 4 kHz, the drive can deliver a maximum closed-loop output of 64 Arms and an open-loop ceiling of 86 Arms, while rated continuous values are 47 Arms and 22 Arms respectively. At the higher 8 kHz switching frequency, the peak closed-loop capability falls to 44 Arms, with continuous service at 31 Arms and 12 Arms for closed-loop and open-loop control modes. These current limits show how much acceleration and braking torque the drive can produce without thermal overload and help match the module to motor impedance and application duty cycle.

Thermal management is handled by backplane air cooling, so cabinet airflow must remove the losses associated with a peak open-loop current of 63 Arms at 8 kHz. The housing spans only 100 mm in width, allowing high-density mounting alongside other Indramat modules on a shared DC bus. Reliable operation is specified for ambient temperatures from 0 to +45 °C, making additional derating unnecessary inside typical factory environments. Motor position data enters through a resolver interface with a resolution of 12 bits, providing the feedback accuracy required for commutation and velocity loops.