WeldKing COOLARC 200, Owner'S Manual

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Manual no. WM070401 Page 21
CoolArc200
Low line mains power voltage Use input voltage
according to
specification
Rectifier short circuit Check and replace
Main transformer short circuit Check and replace
Control transformer short circuit Check and replace
Cooling fan short circuit Check and replace
5 The digital meter do not
display properly
The LED is broken Change the LED
6 The preset current range does
not meet the machine
specification
Initial setting at PCB is not
accurate
Adjust potentiometer
Imin on the control
PCB for min current
and Imax for max
current
7 No OCV Problem main circuit Check control PCB,
Power PCB and
IGBT module
No arc Welding cable and earth cable is
loose or broken
Check and repair
Difficult to strike the arc or
electrode stick to the
workpiece
Loose connection Check connection
and repair
Surface of the workpiece is
contaminated by oil or rust
Clean the workpiece
surface.
Selected wrong welding process. Use the correct
process at panel
Welding current cannot be
adjusted
Welding current adjustment
potentiometer is loose or damage
Check and repair