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ZX7-III Stick/TIG Inverter Welder Repair Reference

A redrawn, English-only reference for ZX7-III power conversion, output behavior and practical diagnostic checkpoints.

What this model page is for

ZX7-III stick/TIG inverters are useful because they connect a common symptom set — no output, breaker trip, no OCV, TIG no start, remote not working and protection light — to one clean power-path model.

Redrawn ZX7-III power path: three-phase input, DC bus, IGBT inverter, high-frequency transformer and output rectifier.
Redrawn ZX7-III power path: three-phase input, DC bus, IGBT inverter, high-frequency transformer and output rectifier.
Redrawn ZX7-III output characteristic: separate panel setpoint from loaded current evidence.
Redrawn ZX7-III output characteristic: separate panel setpoint from loaded current evidence.

Field checkpoints

AreaNormal evidenceFault clue
Input / rectifierThree-phase input is present and rectified into a DC bus.Phase loss, input protection or bridge failure can stop startup or trip the breaker.
IGBT inverterGate drive is permitted and the inverter switches.Shorted IGBT, lost soft-switching condition, bad snubber or driver damage can cause trip/no output.
Output rectifierOCV and loaded current appear at the welding output.20040/output diode failure can produce no OCV, weak output or unstable current.
Control / feedbackCurrent setpoint, current feedback and PI loop agree.Current cannot adjust, random display values or feedback offset indicate control-loop evidence is needed.

Related repair paths