Fault Finding; Welding Problems - NewArc Viper 2000 Operational Manual

4. Fault finding

Machine operation
Most problems with the operation of the Viper 2000 can be overcome by following the procedures
below.
Unit appears to be dead
Ensure that both power source and Viper 2000 are switched on. If the power indictor is not lit then check
for breaks in the power cables. If the power indicator is red then the power cables need to be reversed. If
the power indicator is green then the power cables are correctly polarized.
Porosity (holes) in weld
Generally caused by lack of shielding gas, but could also result from contamination (oil, grease, paint or
rust). Check for too low or too high a flow rate. H.F. but arc will not strike – ensure that the work earth
lead is connected to the positive output connector on the rear of the machine. Check that the correct
shielding gas is being used. Check for too low or too high a gas flow rate.
Unit is sluggish in operation
If the operation of the unit seems sluggish then this may be due to a low supply voltage. Check that
the supply voltage to the unit is in the range of 40 to 100 volts. Voltages outside this range may result in
erratic operation or cause damage to the unit.

4.1 Welding problems

MMA Welding Problems
Most problems with MMA welding are the result of not setting the correct welding parameters for the
welding rod being used. All welding rod packets have information on them in symbolic format , giving
suitable current range, polarity and type of weld (normally called 'position').
If you are in doubt about what these symbols mean, ask your welding rod supplier to explain them.
Choose an initial current setting towards the middle of the quoted range and if necessary practice on a
piece of scrap the same thickness as the job to be welded.
TIG Welding problems
If problems with the Vipers operation while TIG welding are experienced first refer to the information in
the installation section and the operating section.
If the problem still persists have the Viper 2000 checked by a trained Newarc service engineer.
14 VIPER 2000