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Board reference · WSM-315 TIG

WSM-315 TIG control board reference

Use this page when a WSM-315 DC pulse TIG welder has torch-trigger response problems, gas without HF, HF without welding current, post-flow problems, protection light, foot-pedal control faults or current-control abnormalities. The control board should be treated as a signal router between panel, gas, HF, feedback and inverter drive.

Main control-board role

This page is for the main WSM-315 control board

Use this page when the repair question involves the board that coordinates torch input, gas timing, HF command, current command, feedback and protection. It is not the same as the front control panel or the panel PCB.

Which WSM-315 panel/control page should you use?

These pages are intentionally split. The control-panel page explains front-panel behavior and settings; the panel-board page covers PCB/connectors; the control-board page covers the main signal router between torch, gas, HF, current command, feedback and protection.

Control panel behaviorUse for knobs, mode behavior, upslope/down-slope, crater/end current, timing settings and service-code interpretation. Panel board PCBUse for panel PCB, front-panel connector, potentiometer/switch signals, indicators and board-level evidence. Main control boardUse for torch input, gas timing, HF command, current command, feedback and protection routing. No HF / no arc routeUse when starting from a field symptom such as gas-only, no HF, no main current or pedal no response.

Control-board role map

Torch / pedal inputStarts TIG sequence and may select panel or remote command.
Gas timingPre-flow and post-flow logic controls solenoid output.
HF commandEnables arc-start board only during the start window.
Current commandPanel knobs, foot pedal and pulse logic generate welding-current demand.
Feedback / protectionThermal, current feedback and abnormal states may block drive.
Drive enableMain inverter output is allowed only after safety and sequence conditions pass.

Connector and signal checklist

Signal areaFunctionFault symptom
Torch switch / 2T-4TStarts and holds the TIG sequence according to mode.No response, wrong hold behavior, or output stops unexpectedly.
Gas valve outputControls solenoid opening and post-flow timing.No gas, gas always on, or post-flow too long/short.
HF start commandSends timed command to HF arc-start board.Gas works but no HF, or HF stays on after arc transfer.
Current commandPanel current, base current, peak current and remote pedal request.Current not adjustable, stuck low/high current, pedal has no effect.
Pulse controlPulse frequency/duty/peak-base logic for pulse TIG.Pulse missing, unstable pulse or current cycling wrong.
Feedback inputCurrent transformer/shunt feedback and output condition return.Weak output, false shutdown or poor current regulation.
Thermal/protection inputStops output during over-temperature or abnormal conditions.Protection lamp on, no output, intermittent shutdown.

Do not treat gas, HF and current as one fault

Gas action proves only part of the start sequence. HF action proves only the arc-start path. Main welding current still depends on current command, feedback, protection state and inverter drive enable.

Related WSM-315 routes

WSM-315 panel board reference WSM-315 HF arc-start board reference WSM-315 no HF / no arc routing WSM-315 gas, HF and current-feedback path

Related WSM-315 TIG control repair references

Use these links to move between symptom diagnosis, board-level evidence, circuit paths and component or chip checks for the same repair family.

Diagnostic routes

Boards and circuit paths

Components and chips

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