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.

The machine output is intermit-
tently lost.  Gas flow and high fre-
quency are also interrupted.

1.  The problem may be caused

by high frequency inteference.
Make sure that the machine is
grounded properly according
to the installation instructions.
If there are other high frequen-
cy sources in the area, make
certain they are grounded
properly.

2.  Check the Arc Start switch or

Amptrol for proper operation
and loose connections.

1.  The machine internal ground

connections may be loose.
Check the mounting screws on
the protection board, the
bypass boards, and the feed-
thru board.

2.  The protection or bypass

boards may be faulty.  Check
or replace.

3.  Perform the Arc Start Trigger

The arc “flutters” when TIG weld-
ing.

1.  The tungsten electrode may be

too large in diameter.

2.  The tungsten electrode may

needed sharpening.

3.  If helium shielding gas is used,

reduce the percentaghe of heli-
um.

4.  Adjust the gas flow rate to the

proper level for the process
being used.

5.  Check gas hoses and connec-

tions for leaks.

1.  Check for loose shunt connec-

tions, leads #222 and #221.
See Wiring Diagram.

2.  Check polarity switch for loose

or faulty connections.

3.  Perform the SCR Rectifier

4.  Check components R6 and C6

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

5.  The control board may be

faulty.  Replace.

6.  The power board may be

faulty.  Replace.