Product Description:

The DM 8K 6311-D is a servo drive module produced by Bosch Rexroth Indramat within the DM Servo Drives series. It is intended to energize and control synchronous motors in multi-axis machinery, providing current-regulated power stages and closed-loop motion functions. By converting the shared DC bus voltage into phase-accurate output, the unit forms the intermediary between the plant PLC and the motor, enabling precise industrial positioning tasks.

Under the 24 V logic supply, the module draws a control current of 0.89 A, enough to power its microprocessor, gate drivers, and relay circuitry. Power devices are clocked at a factory-set switching frequency of 8 kHz, a value that determines both acoustic behavior and heat generation. With the current controller referenced to 4 kHz, continuous phase current is rated at 5.7 Arms. Operating the same control at 8 kHz reduces this rating to 3.6 Arms because of increased switching losses. For short acceleration bursts, the unit can deliver up to 9.6 Arms at 4 kHz before electronic limits intervene. Internal copper and semiconductor losses create a worst-case thermal dissipation of 96.5 W, and that figure rises linearly with temperature by 0.1 A per kelvin, so cabinet airflow must be sized accordingly. The drive itself weighs 6.0 kg, allowing vertical rail mounting without additional support brackets.

In a multi-axis rack, the drive ties into a non-regulated DC bus that can reach 715 VDC, and its internal regulator keeps the active link for control electronics at 670 VDC. The compact power stage occupies only 50 mm of panel width, permitting dense stacking of adjacent modules. A resolver interface with 12-bit angular resolution feeds actual position back to the axis controller, and integrated positioning control executes profile moves directly. Motion commands arrive through the PROFIBUS-DP setpoint interface, while thermal derating curves ensure current limits are respected without repeated parameter tuning.