Product Description:

Bosch Rexroth Indramat manufactures the DMA 085B 3301-D drive module for the DMA Servo Drive Modules series. As a three-phase unit intended for both synchronous and asynchronous motors, it forms the power stage between the supply section and the motor windings in automation axes. The module slides onto an RMB/DM backplane inside a multi-axis cabinet, where it interfaces with the common DC bus to share energy among adjacent axes while keeping the footprint compact.

The control electronics demand an auxiliary supply of 1.35 A at 24 VDC, which powers gate drivers, sensors, and logic without burdening the main DC link. That link is maintained at 670 VDC regulated / 715 VDC non-regulated, giving the internal IGBT bridge sufficient headroom for field-oriented control at high speed. When acceleration peaks occur, phase conductors can carry up to 86 Arms at a 4 kHz carrier frequency or 63 Arms at 8 kHz before the overload timer intervenes. Continuous switching and control electronics dissipate up to 380 W, so the rear-mounted air-cooling channel moves heated air away from the backplane. Analog 12-bit setpoint lines accept velocity or torque commands and pass them directly to the internal current regulators.

Under closed-loop operation, the module sustains 47 Arms at 4 kHz or 31 Arms at 8 kHz without derating, matching common motor impedance values while lowering audible switching noise at the higher carrier. The integrated resolver interface samples shaft position in 12 bits, providing 4096 discrete electrical angles per revolution for precise phase alignment. The housing is 100 mm wide, 504 mm high, and 288 mm deep, and the overall mass is 11.5 kg, which supports secure installation on the cabinet rail. These dimensions leave adequate clearance for airflow while maintaining cabinet density in multi-axis machining or material-handling systems.