Primary inverter/output path is working.
Fault route
WSE AC Output Missing but DC Output Normal Diagnostic
A secondary-stage diagnostic route for WSE AC/DC TIG machines.
Quick Answer
If WSE DC output is normal but AC output is missing, the primary inverter is probably not the first suspect. Check AC/DC panel command, secondary driver supply and secondary inverter switching.
- DC output normal proves the primary welding-output path is at least partially working.
- AC output missing points toward AC/DC mode command or secondary inverter/driver stage.
- Do not replace primary IGBT devices before proving secondary-stage evidence.
WSE AC output missing route
Primary output first, then secondary command and switching.
Panel/control board should request AC mode.
Driver supply/drive must reach secondary inverter.
Polarity switching stage creates AC output.
Check AC balance and output behavior.
AC-missing evidence table
| Evidence | Meaning | Direction |
|---|---|---|
| DC output normal | Primary stage not first suspect. | Move to secondary stage. |
| AC mode command absent | Panel/control-board command issue. | Check WSE panel and command path. |
| Secondary driver absent | Secondary driver/supply issue. | Repair driver before inverter devices. |
| Secondary inverter not switching | Secondary power-stage issue. | Check secondary switching devices and gate drive. |
| Balance abnormal | Command or switching mismatch. | Check panel balance and secondary response. |
Related records
Use these to continue.