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66
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12. MAINTENANCE AND TROUBLESHOOTING
(Continued)
12.1 Carrying out Maintenance on the Welding Power Source
Periodically check the welding power source to ensure the safety of the equipment and the
efficiency of work.
●
Check the following daily:
–
No strange vibration, buzzing noise, and burning smell are generated from the welding power
source.
–
No excessive heat is generated from the cable connections.
–
The cooling fan is running normally after turning on the power switch.
–
The switches properly function.
–
Connections and insulation of cables are surely made.
–
There is no break in cables.
–
Fluctuation of the power source voltage is not large.
–
The grounding cable is surely connected. (Disconnection of the grounding cable may result in
failure or malfunction of the equipment.)
●
Check the following each three to six months:
–
There is no damage inside the torch.
Verify there are no aging or damaged parts inside the welding torch.
–
There are no loose connections or no poor contacts caused from rust, on input side of the
welding power source and output side of the cables.
–
There is no trouble with insulation.
–
The welding power source is properly grounded.
–
Built-up dust on the transistor or the cold plate on the rectifier may affect the equipments. Take
off the cover of the welding power source once a half year, then remove dust by blowing
moisture-free compressed air on each part.
–
The dust protective filter located on the inlet of the fan does not clog, which may result in
damage to the welding power source. Be sure to inspect it periodically.
12.2 Precautions for Replacement of the Printed Circuit Board
1) To ensure safety, must shut off the power of the distribution box and wait for 3 minutes before
any maintenance and overhaul inside the welding power source (the time for the capacity
inside the power supply to discharge is about 3 minutes). In addition, this welding power
source adopts a high-frequency inverter method and many parts are connected to the input
side, so do not turn on the switch at the input side accidentally when performing overhaul.
2) Verify that the plug-in numbers printed on the circuit boards are in accordance with those on
the bunched wires, and then plug them in place firmly after confirmation. Wrong insertion or
connection may damage the circuit boards and even the entire machine.
3) Do not turn on the power switch when connector assemblies of circuit
boards are pulled out.
Please perform connection
according to plug-in number.
Wminfo
