Siemens 6RA8081-6DS22-0AA0 SINAMICS DCM D485/400 400V 3AC 332A to 485V DC 400A 2Q DC Converter

The Siemens 6RA8081-6DS22-0AA0 is a SINAMICS DCM 2-quadrant DC converter with a B6C connection, rated for 400 V 3AC 332 A input and delivering 485 V DC at 400 A to the armature, with a D485/400 field rectifier (MRE-GEEF6S22) for the motor field winding. It weighs 28.0 kg and is manufactured in China.

Selection Notes

The B6C single-bridge connection makes this a 2-quadrant converter: it controls armature current and speed in one direction of torque but has no regenerative braking path back to the AC line, unlike the (B6)A(B6)C 4-quadrant units in the same DCM range. That makes it the lower-cost, simpler choice for loads that run in one torque direction without needing electrical braking, such as pumps, fans, or extruders, where a 4-quadrant unit would be unnecessary. At 400 A and 485 V DC output it also sits at the high-current end of the DCM lineup, sized for larger separately excited DC motors than the 90 A and 210 A variants in the family. The D485/400 field rectifier supplies the motor's separate field winding without an external field supply.

Applications

Armature and field control for separately excited DC motors in pumps, fans, extruders, and other large single-direction industrial drives running from a 400 V 3AC supply where regenerative braking is not required.