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Problem
Solutions
Indicator of power
switch is not lit,
A. Make sure power switches close.
fan is not working
B. Make sure electrify wire net (which is connected to input cable) is in
and there is not
work.
welding output.
A. Maybe be connected wrong to 380v power cause machine is in
protection circuit, connect to 220v power and operate machine again.
Power indicator
B. 220v power is not stabilizing (input cable is too slender) or input cable is
is lit, fan does
connected to electrify wire net cause machine is in protection circuit.
not work and
Increase the section of input cable and tighten input connector firmly. Close
machine 5-10 minutes then open it again.
there is no welding
output.
C. Open and close power switch in short time cause protection circuit is
working. Close machine and open it again afterS-10 minutes.
D. Cables are relaxed between power switch and power source board,
tighten them again.
Fan is working,
welding current
is not stabilixing
or out of potential
A. Quality of 1K potential is bad, replace it.
control, current is
sometimes low
B. Terminal of output is broken circuit or poor connect.
and sometimes
high.
A. Check if components are poor connects.
Fan is working,
B. Check if connector of output terminal is break circuit and poor connect.
and abnormal
C. Check voltage between power source board and MOS board (VH-07) is
indicator is not
lit, there is no
D. If green indicator is not lit in assistant power of MOS board, please
welding output.
E. If there is some question in control circuit, please connect with seller or
A. Maybe over-current protection is working, please close machine and
B. Maybe overheated protection is working, wait for 2-3 minutes.
C. Maybe inverter circuit is in fault; please pull up the power plug of main
Fan is working,
and abnormal
indicator is lit,
but there is no
welding output.
D. Maybe feedback circuit is in fault.
about DC 380v.
connect with seller or out company and replace it.
our company and replace it.
waiting. After abnormal indicator is not on, open machine.
transformer(near VH-07 fan), which is on MOS board, then open the
machine again.
(1) If abnormal indicator is still lit, some of MOS board is damaged,
check and replace it.
(2) If abnormal indicator is not lit:
i. Maybe transformer of middle board is damaged, measure
primary inductance volume and Q volume of main
transformer by inductance bridge.
ii. Primary volume is parallel circuit, L=l.2-2.0Mh, Q~ 40
If inductance volume and Q volume is low, replace it.
iii. Maybe some of secondary rectifier tube of transformer is
broken, check and replace rectifier tube.
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