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TROUBLESHOOTING AND FAULT FINDING
Notes: The following operations must be performed by qualified electricians with valid certifications.
Before maintenance, please contact with us for professional suggestion.
Fault symptom
Power indicator is not lit, fan
does not work and no
welding output
Power indicator is lit, fan
works, no welding output
Power indicator is lit, fan
works, abnormal indicator is
lit.
If the machine fails to work normally after maintenance and check, please contact the local dealer or after-sale
service centre.
1. Make sure air switch is closed.
2. Check if electric wire net is in work.
3. Some of heat-variable resistors(four) of power panel is damaged, when it
happens, general DC24V relay is open or connectors are poor contact.
4. Power panel (bottom board) is damaged, DC 537V voltage cannot be output.
1) Silicon bridge is broken or connector of silicon bridge poor contact.
2) Power panel has been burned up.
3) Check contact and insert cable from air switch to power panel are poor
contact, check contact and insert cable from power panel to MOS board
are connected reliably.
5. Auxiliary power of control panel is in fault.
Check if all kinds of cables of inter-machine are poor contact.
1.
2.
Output connector is cut off
Output connector is cut off or poor contacted.
3.
Control circuit is broken.
4.
Maybe it is overheated protection, please turn off machine first, then
1.
turn on the machine again after abnormal indicator is off.
2.
Maybe it is overheated protection, wait for 2-3 minutes.
Maybe inverter circuit is in fault, please pull up the supply power plug of
3.
main transformer which is on MOS board (VH-07 insert which is near the
fan) then open the machine again:
1) If abnormal indicator is still lit, some of fieldistor of MOS board are
damaged, find out and replace them with same model.
2) If abnormal indicator is not lit:
a. Maybe transformer of middle board is damaged, measure
inductance volume and Q volume of main transformer by
inductance bridge. If volume is too low, please replace it.
b. Maybe secondary rectifier tube of transformer is damaged, find out
faults and replace rectifier tube with it.
Remedy
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