Product Description:

The DMA 085B 5311-D is a three-phase servo drive module manufactured by Bosch Rexroth Indramat and assigned to the DMA Servo Drive Modules series. It converts the rectified supply into a controlled DC link for synchronous and asynchronous motors, providing velocity and position regulation in packaging lines, assembly cells, and material-handling equipment. The unit mounts on a backplane and communicates motion commands through a PROFIBUS-DP setpoint interface. This layout suits modular multi-axis racks where several drive axes operate from a common power structure.

The module uses a regulated DC link of 670 VDC, with an unregulated level of 715 VDC present before the internal chopper stabilizes it. When operated at a 4 kHz pulse pattern, the drive can deliver a peak phase current of 86 Arms and a continuous rating of 22 Arms. Switching at 8 kHz reduces switching losses, but it limits the peak current to 63 Arms and the continuous output to 12 Arms. Two axial fans draw air through the rear of the rack because the design relies on backplane air cooling to keep semiconductor temperatures within limits. Multi-turn encoder inputs are resolved to 32-bit accuracy over 4096 revolutions, while single-turn and resolver feedback channels are processed at 20-bit and 12-bit depth, allowing the module to work with several common motor feedback types.

The auxiliary 24 V control supply draws 1.35 A, powering logic circuits and fan startup when the main link is de-energized. This separate supply allows communication and internal supervision to remain active before the power stage is enabled. Under worst-case conditions, the power section dissipates 380 W, and this heat is removed by the two integrated fans. The housing is 100 mm wide so multiple axes can be fitted side by side on a common rail, and the mass of 11.5 kg allows manual installation without lifting equipment. Constant DC distribution through the backplane lets adjacent modules share energy during regenerative and motoring cycles.