155
English
Note:
The following operations require operators to master sufficient professional electrical knowledge and all-
round safety common sense and to possess valid qualification certificates in accordance with their capability and
knowledge. Before making repairs, we suggest that you first contact a local dealer to obtain approval.
Fault symptom
Remedy
Machine is switched on:
•
power indicator is not lit;
•
fan does not work;
•
no welding output�
1� Make sure that on / off switch is in "on" position, and it is not
damaged�
2� There is no input power supply�
3� Two cement resistor 7W47R, or the 24 V 30 A relay is damaged�
4� Auxiliary power modules, diodes BYV26E, K3878 (K2225) is
damaged�
5�
Filter capacitor and silicon rectifier bridge damaged.
Machine is switched on:
•
power indicator is lit;
•
normal welding output;
but
:
•
fan does not work�
1� Check if the fan is damaged�
2� Check whether the fan power supply socket is voltage output�
Machine is switched on:
•
power indicator is lit;
•
fan is working;
but:
•
output current is unstable and cannot
be controlled by the potentiometer when
welding�
1� Check if the potentiometer (1K) is damaged, or there is a loose
connection wire�
2� Potentiometer connection poorly contacts, especially the
connector assembly, check it �
3� Feedback circuit malfunction� Please contact the distributor or
the company�
Machine is switched on:
•
power indicator is lit;
•
fan is working;
•
O�C� indicator is not lit;
but:
•
no welding output�
1� Output connection circuit disconnection or poor contact�
2�
Test whether the drain voltage of the four drive field tube is
about 14 V�
3� Control circuit problem, please contact the distributor or the
company�
Machine is switched on:
•
power indicator is lit;
•
fan is working;
but:
•
O�C� indicator is lit;
•
no welding output�
1� Overcurrent protection: switch off the machine until the O�C�
indicator is off, then restart�
2� Overheating protection: wait for 5-10 minutes without switching
off the machine, and it will recover automatically�
3� Inverter circuit malfunction� Check if the IGBT module and
single tube have been damaged�
4�
Secondary fast recovery rectifier individual breakdown, find
and replace the same type of rectifier.
5� Feedback circuit or control board malfunction, please contact
the distributor or the company�
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