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5. Indicator lamp for fault is off
and with rustle caused by
high frequency discharging.
Arcing when struck.
6. Indicator lamp for fault is on
but without output.
7. Output current is unstable or
not
controlled
potentiometer
welding.
8. Alkaline
welding
difficult to operate due to
serious splashing for manual
welding.
VII. Troubleshooting
1. Poor contact between primary wire of arcing transformer and power plate.
Refix it.
2. Discharge nozzle is oxidized or too long. Remove the surface oxidation film
of discharge nozzle or adjust the distance of discharge nozzle to 1 mm.
3. Changeover switch of manual and argon arc welding is damaged. It is need to
be replaced.
4. Some elements of high frequency arcing circuit are damaged. Check and
replace.
1. Over current protection. Shut down and restart after indicator lamp for fault is
off.
2. Overheating protection. Do not shut down and wait for 2 to 3 minutes.
3. Inverter circuit is fault. Remove power plug for main transformer on MOS
plate (close to fan VH-07 inserter) and restart.
(1) Indicator lamp for fault is still on. Shut down and remove high frequency
arcing power plug (close to fan VH-03 inserter) and restart.
a. Indicator lamp for fault is on due to some field effect transistors on MOS plate
are damaged. Check and replace the same type field effect transistor.
b. Indicator lamp for fault is off due to step up transformer of high frequency
arcing circuit is damaged and need to be replaced.
(2)
Indicator lamp for fault is off.
a. Medium transformer is damaged. Measure the primary inductance and Q
value of transformer by electric bridge. If L=0.9-1.6mH, Q>35 as well as
inductance and Q value is very small, replace it.
b. Some transformer secondary rectifying tubes are penetrated. Check and
replace by same type.
4. Feedback circuit is opened.
1. IK potentiometer is damaged and need to be replaced.
by
2. Check poor contact for each connection especially for connector etc.
during
rod
is
1. Polarity connection is wrong and it is need to change the polarity of grounding
cable and welding torch cable.
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