Lincoln Electric PRECISION TIG 225 Operator's Manual page 31

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PROBLEMS
(SYMPTOMS)
Machine output is intermittently lost.
Gas flow and high frequency are
also interrupted.
Arc "Flutters" when TIG welding.
Arc "Pulsates" when AC TIG weld-
ing.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
TROUBLESHOOTING
Observe all Safety Guidelines detailed throughout this manual
POSSIBLE
TIG MODE PROBLEMS
1. Problem may be caused by high
frequency interference. Make sure
that the machine is grounded
properly according to the installa-
tion instructions. If there are other
high frequency sources in the
area, make certain that they are
grounded properly.
2. Check Amptrol for proper opera-
tion and loose connections.
3. Check to make sure that the input
voltage is correct for the machine
reconnect configuration. Refer to
Reconnect Procedure in the
Installation section of this report.
1. Tungsten electrode may be too
large in diameter for the current
setting.
2. Tungsten not "sharp" when weld-
ing in DC - mode.
3. Gas shielding may be insufficient.
Increase gas flow; reduce tung-
sten stickout beyond gas cup.
4. Check for contaminated gas or
leaks in the gas line, torch, or con-
nections.
5. If a helium blend is used as a
shielding gas, then reduce the
percentage of helium.
1. Make sure the gas and procedure
are correct for the process being
used.
2. Micro Switch mounted on Polarity
Switch is not opening in "AC"
mode.
PRECISION TIG 225
CAUSE
If all recommended possible areas of
misadjustment have been checked
and the problem persists, Contact
your local Lincoln Authorized
Field Service Facility.
CAUTION
RECOMMENDED
COURSE OF ACTION
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