Product Description:

The DMA 085B 6111-D is a three-phase servo drive module built by Bosch Rexroth Indramat for the DMA Servo Drive Modules series. It controls synchronous or asynchronous motors in positioning and speed control applications while supplying power, feedback processing, and axis management inside an automation cabinet. Its design supports one-axis positioning, so a single module can handle an individual machine axis without external motion cards, which helps simplify cabinet layouts in packaging, printing, or material-handling lines.

The drive’s DC bus is maintained at 670 VDC in regulated mode, while incoming energy can climb to 715 VDC when the internal chopper is inactive. This range reflects allowable DC-bus variation during braking events. At a 4 kHz PWM carrier, the inverter delivers a rated output of 22 Arms and can rise to a maximum of 86 Arms for short overloads. When the switching frequency is increased to 8 kHz to reduce motor noise, thermal limits reduce continuous current to 12 Arms and the peak envelope to 63 Arms. A 24 V control supply draws 1.35 A to keep the logic, encoder evaluation, and brake release circuits active during mains removal. Internally, the module uses a 32-bit measuring system and tracks up to 4096 revolutions, so multi-turn feedback retains position across power cycles.

The unit communicates with higher-level PLCs over the PROFIBUS-DP fieldbus, which follows the IEC 1158-2 signaling standard and supports rapid parameter exchange and diagnostics. Cooling air is pulled across the heat sink from the cabinet backplane, and the electronics are protected to IP20, allowing mounting in clean electrical enclosures. Mechanical durability includes a shock rating of 15 g, which helps protect the control board during transport or plant-floor vibration. Thirty-two traversing blocks and dedicated resolver inputs support the motion functions needed for precise indexing duties.