DMA 085B 7301-D Bosch Rexroth Indramat
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MPN: 1070079652
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The Bosch Rexroth Indramat DMA 085B 7301-D is a 3-phase module for synchronous and asynchronous motors and is part of the DMA Servo Drive Modules series. This backplane module has a rated current of 47 Arms at 4 kHz and 31 Arms at 8 kHz, with a maximum power loss of 380 W. It features an air cooling method, a resolver encoder interface with 12-bit resolution, and weighs 11.5 kilograms.
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Product Description:
The DMA 085B 7301-D is a servo drive module built by Bosch Rexroth Indramat for the DMA Servo Drive Modules series. The unit is a three-phase power stage that supports synchronous and asynchronous motors and is inserted into an RMB/DM backplane, which supplies the common DC link and cooling airflow. Within tightly packed multi-axis machine tools and material-handling stations, the module converts DC bus energy into phase-aligned motor currents so the controller can execute precise velocity and torque commands.
The shared bus can operate with an unregulated link voltage of 715 VDC and a regulated value of 670 VDC, giving upstream supplies flexibility while keeping the internal power section within semiconductor limits. During short acceleration events, the drive can deliver up to 86 Arms at a 4 kHz pulse frequency or 63 Arms at 8 kHz; these overload figures set the ceiling for torque boosts. Continuous operation is limited to 47 Arms at 4 kHz and 31 Arms at 8 kHz, so thermal rise stays compatible with the air-cooled backplane arrangement. A resolver interface provides sine-cosine feedback, and the CANrho setpoint channel lets the supervisory controller stream current or velocity references directly. With 100 mm of front-panel width, the module fits alongside other DMA units without exceeding standard cabinet pitches.
The control electronics draw 1.35 A from the 24 V service rail, and total dissipation is limited to 380 W; this heat is extracted by the forced airflow that passes through the rear heat sink. A mass of 11.5 kg keeps vibration response low when the module is latched into the backplane mechanics. Resolver feedback is digitized at 12 bits, allowing the upstream motion controller to close position loops externally because the module itself has no internal positioning control. By centralizing regulation and sharing the bus, the DMA rack simplifies wiring while maintaining consistent current margins across multiple axes.
Frequently Asked Questions about DMA 085B 7301-D:
Q: What is the 24 V power demand for the DMA 085B 7301-D servo drive module?
A: This module requires 1.35 A at 24 V for auxiliary operation.
Q: Which setpoint interface is provided on the DMA 085B 7301-D?
A: The DMA 085B 7301-D utilizes a CANrho setpoint interface for control input.
Q: What type and resolution of encoder interface does the DMA 085B 7301-D support?
A: This drive uses a resolver encoder interface with a 12-bit resolution.
Q: What are the rated current values of DMA 085B 7301-D at different switching frequencies?
A: It offers a rated current of 47 Arms at 4 kHz and 31 Arms at 8 kHz.
Q: How is the DMA 085B 7301-D servo drive module cooled?
A: The cooling method is air cooling through the backplane, ensuring efficient heat dissipation.
