Telwin HF Serie Manuel D'instructions Et D'entretien page 14

INCONVENIENCE
Arc can not be ignited
(TIG), there is HF
spark
HF striking arc can not
be stopped
No gas flow (TIG)
The alarm light on the
front panel is on
14
CAUSE
Welding cable is not properly con-
nected, is damaged or too long.
The distance between tungsten
electrode and workpiece is too
long.
There is oil or dust on the
workpiece.
Torch trigger is defective.
Control PCB is defective.
Gas cylinder is close or gas pres-
sure is low
Control PCB is defective.
Over heat protection - Two much
welding current
Over heat protection -
Working time too long
Over-voltage protection -
Power supply fluctuates
Low-voltage protection -
Power supply fluctuates
Over-current protection -
Unusual current in the main
circuit
REMEDY
Check for proper cable connection.
Ensure it is in good conditions and
its lenght is not too long.
Reduce the distance, about 3mm.
Clean the workpiece before
welding.
Check for proper TIG torch con-
nection to the unit / Contact after
sales service centre.
Contact after sales service centre.
Open gas cylinder valve or adjust
gas pressure.
Contact after sales service centre.
Reduce the welding current output
Reduce the duty cycle (work
intervally)
Using the stable power supply
Using the stable power supply
Contact after sales service centre.