ABB 3HAC031851-001 is the DSQC 633A serial measurement board unit used in ABB robot SMB configurations. It supports the manipulator measurement path that retains and transfers axis-position reference data.
ABB 3HAC031851-001 is identified in ABB spare-part data as an SMB unit for M2004 robot configurations. ABB documents replacement by SMB sets 3HAC046686-001, 3HAC046686-002, 3HAC046686-003 or 3HAC046686-004; paint systems use the specified 3HNA006142-001 part.
ABB 3HAC031851-001 must be matched to the installed robot, battery-contact variant, SMB enclosure and cable set. The appropriate replacement-set suffix must be selected from the robot documentation, and revolution counters must be verified after service.