Circuit path · WSM-315 sequence
WSM-315 gas, HF and current-feedback path
This path reference explains how a WSM-315 TIG welder coordinates torch input, gas solenoid, HF start, current command, inverter output, current feedback and HF cutoff. It helps diagnose cases where one part of the sequence works but the next does not.
Combined sequence path
Sequence failure interpretation
| Works | Does not work | Likely boundary |
|---|---|---|
| Torch input | Gas valve | Gas timing output, solenoid relay, solenoid coil or wiring. |
| Gas valve | HF start | HF enable command, HF relay, HF board supply or HV path. |
| HF start | Main current | Drive enable, output stage, current command, work clamp or torch output path. |
| Main current | Current control | Panel pot, foot pedal command, feedback and control-loop path. |
| Main arc | HF cutoff | Arc-detect / current-feedback / HF relay release path. |
| Gas output | Post-flow timing | Panel timing command, timing circuit or gas relay release. |
Useful cross-checks
Local vs remote
If panel current works but pedal does not, the fault is likely remote connector, pedal pot or remote selection path.
Gas vs HF
Gas action confirms trigger logic but not HF board health or main-output enable.
HF vs current
HF spark confirms ignition path but not inverter drive or output rectifier health.
Signal-path principle
In WSM-315 diagnosis, the most important question is not “which board is bad?” It is “which step of the sequence stopped?” That answer decides whether to inspect panel, control board, gas/HF board, feedback or power output.