Lincoln Electric SVM118-A Manual Do Utilizador

Observe Safety Guidelines

detailed in the beginning of this manual.

If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con-
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed.  Call
216-383-2531 or 1-800-833-9353.

Open circuit voltage is present at
the output terminals even when
the Arc Start switch or Amptrol is
NOT actuated.

1.  The Arc Start switch or

Amptrol may be defective.
There should not be any conti-
nuity between pins “D” and “E”
on the Arc Start cable connec-
tor, unless the unit is actuated.

1.  Check the trigger circuit.

2.  The control board may be

faulty.  Replace.

3.  The power board may be

faulty.  Replace.

Arc rectification when AC TIG
welding.

1.  The tungsten electrode may be

too small for the process.

2.  The AC Wave Balance control

may be misadjusted.  Adjust
for more penetration.

3.  If helium shielding gas is being

used, reduce the percentage of
helium.

1.  Check components R6 and C6

in the high voltage transformer
primary circuit.  Replace if nec-
essary.

2.  Perform the SCR Rectifier

3.  The control board may be

faulty.  Replace.