- 14 -
discharge "sa sa
sa" sound, no
welding output.
Abnormal
indicator light
does not light, no
high frequency
discharge "sa sa
sa" sound, "LIFT
TIG welding" can
start arc
1. The primary line of the arcing transformer has poor contact with the power board and
is retightened.
2. The discharge nozzle is oxidized or the distance is remote. The surface oxide film of
the discharge nozzle is treated or the distance of the discharge nozzle is adjusted to 1
mm.
3. The individual components of the high-frequency arc-ignition circuit are damaged,
and the replacement is found.
Abnormal
indicator light is
on, no output
1. It may be overcurrent protection. Please turn off the machine. When the abnormal
indicator light is off and then restarted, it can be restored.
2, may be overheat protection, do not need to shut down for 2-3 minutes, the machine
can naturally return to normal.
3. It may be that the inverter circuit is faulty. Please unplug the power supply plug of the
main transformer on the MOS board (near the fan VH-07 plug-in) and restart it:
(1) If the abnormality indicator is still on, turn off the power plug of the high-frequency
pilot arc power supply (near the fan VH-03 plug-in) and turn it back on:
a. If the abnormal indicator is still on, the individual FETs on the MOS board are
damaged.
b. If the abnormal indicator is not lit, the step-up transformer in the high-frequency
arc-rising circuit on the power supply board is broken and replaced.
(2) If the abnormal indicator does not light:
a. It may be damaged in the middle plate transformer. The primary inductance and Q
value of the main transformer can be measured by the bridge.
b. It may be that the transformer secondary rectifier is individually broken down, and
the same type of rectifier is found and replaced.
4. It may be that the feedback circuit is open.
Can not break the
oxide film when
welding aluminum
1. The welding gear selection is incorrect;
2. The duty cycle adjustment is too small;
3. The secondary inverter has field tube damage.
Tungsten needle
burnt seriously
The duty cycle is adjusted too much to reduce the duty cycle.
