Product Description:

Bosch Rexroth Indramat builds the DMA 045A 6311-D as part of its DMA Servo Drive Modules series. The unit is a three-phase drive module for synchronous and asynchronous motors, intended to provide closed-loop speed and torque control for a single mechanical axis in automated machinery. By combining power conversion with integrated motion functions, the module serves as the axis amplifier inside multi-drive backplanes used in packaging, material handling, and general motion systems. It is intended for single-axis operation, where the drive must manage torque production, speed regulation, and response to changing machine loads.

The power stage operates from a DC link of 670 VDC regulated / 715 VDC unregulated, supplying peak currents up to 51 Arms at a 4 kHz switching frequency and 44 Arms at 8 kHz when short-term overload is needed. Continuous operation is supported at 23 Arms at 4 kHz or 15 Arms at 8 kHz, and the output must be reduced above these levels according to derating slopes of 0.65 A/K and 0.45 A/K. The module uses backplane air cooling to remove heat and keep semiconductor temperatures within limits, and its 7.3 kg mass adds thermal inertia during load changes. Cabinet dissipation does not exceed 220 W under rated load, and the 50 mm width allows dense stacking in typical enclosures.

The control section draws 1.32 A from the 24 V auxiliary supply and includes one-axis positioning as an embedded motion function, which removes the need for an external single-axis PLC card. Command values arrive through a PROFIBUS-DP setpoint interface, while a resolver channel with 12-bit resolution returns rotor position to the current controllers. Resolver feedback also provides absolute angle and speed information to support current control during changing loads, and electrical integration is simplified because the standard variant requires no option cards beyond the built-in resolver interface.