DMA 85B 3301-D Bosch Rexroth Indramat
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The Bosch Rexroth Indramat DMA 85B 3301-D is a 3-phase module for synchronous and asynchronous motors and is part of the DMA Servo Drive Modules series. This standard variant features air cooling via the backplane, a resolver encoder interface, and analog interface options with 12-bit resolution. The module has a width of 100 mm.
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Product Description:
The Bosch Rexroth Indramat DMA 85B 3301-D belongs to the DMA Servo Drive Modules series and functions as a rack-mounted power inverter for synchronizing motor currents with command signals in industrial automation. It forms part of multi-axis Servodyn racks where individual axes share a common DC bus, allowing compact cabinet layouts for packaging, printing, or material-handling equipment. This arrangement supports centralized power distribution while keeping several axis modules within a single rack. By converting three-phase mains into a regulated output, the module closes the current loop around synchronous and asynchronous motors and forwards position data to the master controller for coordinated motion.
The thermal design relies on backplane air cooling, so airflow moves across the rear heat sinks and adjacent modules can be mounted closely. Feedback terminals accept a resolver, giving rotor position and speed information that supports homing-free startup after a power cycle. Command voltages arrive through an analog input with 12-bit resolution, providing 4096 discrete levels that the internal DSP converts into pulse-width-modulated phase currents. The digital control section interprets these levels quickly, which helps maintain smooth torque response during speed changes and synchronized moves. Cabinet space is conserved because the front panel width is only 100 mm. The device is assigned to the Servodyn-D series, so it uses the parameter structure shared by compatible drives in the same platform.
The hardware platform is classified as a three-phase module for synchronous and asynchronous motors, making it suitable for both spindle duties and permanent-magnet axes powered from the same DC link. The build level is the standard variant, which indicates the standard current ratings and protective circuitry used for this module type. Because the module can work with more than one motor type, it fits mixed-motion systems that combine process axes and spindle-style loads in the same enclosure. Its rack-mounted format also leaves room for neighboring power components such as braking units or filters while supporting coordinated operation across several axes.
