Knob/potentiometer or digital setting changes the command.
Fault route
WSM-315 Current Cannot Adjust Diagnostic
A WSM-315 TIG current-command route for current adjustment faults.
Quick Answer
When WSM-315 current cannot adjust, split the fault between panel setting, control-board command processing, feedback path and power-stage response.
- If the panel knob or setting is not read correctly, the control board may never receive the right command.
- If command is valid but real current is wrong, feedback or output-stage response may be the problem.
- Do not replace the panel until feedback evidence is separated from command evidence.
WSM-315 current-adjust route
Command, feedback and output response are separate layers.
Control board must receive the command.
Current feedback can override or distort command response.
Driver/inverter stage must respond to command.
Current-control evidence table
| Observed behavior | Likely layer | Next check |
|---|---|---|
| Knob changes nothing on panel/display | Panel/potentiometer issue. | Check panel command path. |
| Panel changes but current does not | Control board, feedback or power stage. | Check command output and feedback. |
| Current jumps or is unstable | Feedback or poor connection. | Check feedback path and output wiring. |
| Current limited low | Feedback/current command mismatch. | Check shunt/Hall/current feedback if present. |
Related records
Use these depending on the layer.