DMA 085B 1101-D Bosch Rexroth Indramat
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MPN: 1070085645
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The Bosch Rexroth Indramat DMA 085B 1101-D is a 3-phase module from the DMA Servo Drive Modules series designed for both synchronous and asynchronous motors. It features a regulated DC link voltage of 670 VDC, air cooling via backplane, and a 24 V supply current of 1.35 A. The module supports SERCOS setpoint interface and offers an IP20 degree of protection with a maximum current output of 63 Arms at 8 kHz.
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Product Description:
The DMA 085B 1101-D is a servo drive module manufactured by Bosch Rexroth Indramat within the DMA Servo Drive Modules series. Built as a 3-phase power stage for synchronous and asynchronous motors, it converts the shared DC bus into phase-accurate stator currents. The unit mounts inside a control cabinet, uses backplane airflow, and communicates through a SERCOS command channel to execute one-axis positioning tasks in automated production lines. This arrangement keeps power conversion and motion control closely integrated inside a compact cabinet module.
At system start, the control electronics draw 1.35 A from the 24 V auxiliary supply, while the main power section operates on a regulated bus of 670 VDC. During open-loop operation at the 8 kHz switching frequency, the module can deliver up to 63 Arms, and in closed-loop mode it sustains 31 Arms continuously. A derating factor of 0.95 A per kelvin is applied from 45 °C up to 55 °C to protect the output stage. Two integrated fans support the backplane air-cooling concept so cabinet air is exchanged without external ducting. Feedback processing is flexible: the standard interface accepts resolver signals at 12-bit resolution, while motion target generation is held at 32-bit depth and stage regulation uses 20-bit arithmetic.
Cabinet integration is simplified by the IP20 enclosure rating and a module width of 100 mm. With both fans operating, the drive adds 380 W of thermal load to the enclosure, so ventilation planning must account for this fixed loss. High-speed incremental feedback is accepted up to 1 MHz, and sine-cosine encoders are limited to 800 kHz, allowing accurate control of fast rotary or linear axes. Its slim housing suits row-based cabinet layouts where several axis modules are installed side by side. The module maintains one-axis positioning logic internally, aided by resolver and encoder data.
Frequently Asked Questions about DMA 085B 1101-D:
Q: What cooling method does the DMA 085B 1101-D servo drive use?
A: The DMA 085B 1101-D features an air cooling method via the backplane for temperature management.
Q: What is the rated current capacity of the DMA 085B 1101-D module?
A: This module has a rated current of 31 Arms when running closed loop at 8 kHz switching frequency.
Q: What type of setpoint interface is available on the DMA 085B 1101-D?
A: The DMA 085B 1101-D supports a SERCOS setpoint interface for communication.
Q: What is the incremental encoder frequency limit for the DMA 085B 1101-D?
A: It offers an incremental encoder limit of up to 1 MHz for high-resolution feedback applications.
Q: What is the degree of protection of the DMA 085B 1101-D drive?
A: The degree of protection for this model is rated at IP20.
