Potentiometer/encoder/switch command should change predictably.
Fault route
WSM/WSE TIG Current Control Panel Faults
A current-command diagnostic route for WSM and WSE TIG welders.
Quick Answer
WSM/WSE current-control faults should be split between panel potentiometers/settings, control-board processing, current feedback and power-stage response.
- If panel settings change but output does not, check whether the control board sees the command.
- If command is valid but current is wrong, inspect current feedback before replacing the panel.
- For WSE AC mode, separate primary current control from secondary inverter AC/DC switching.
Current-control split
Panel command is only one part of current regulation.
Control board must process command into output permission/current command.
Hall/shunt/feedback path can override or distort command.
Driver/inverter stage must respond to the command.
WSE AC/DC machines add a secondary switching layer.
Panel-current fault table
| Observed behavior | Likely layer | Next check |
|---|---|---|
| Panel current knob has no effect | Potentiometer/wiring/control-board input. | Check panel-to-control signal. |
| Display changes but real current does not | Feedback or power-stage response. | Check feedback and driver stage. |
| Pulse setting ignored | Panel command or control-board processing. | Check pulse command path. |
| AC balance abnormal | WSE panel or secondary inverter/driver path. | Open WSE panel and secondary driver references. |
| Current too high/low after start | Feedback path or calibration/command mismatch. | Check feedback evidence before panel replacement. |
Related records
Use these based on the layer.