Lincoln Electric IM467 SQUARE WAVE TIG 355 - Manual (Page 41)

TROUBLESHOOTING E-2 E-2
SQUARE WAVE TIG 355
TROUBLESHOOTING GUIDE Observe Safety Guidelines
detailed throughout this manual.
STICK WELDING
SYMPTOM CAUSE AND REMEDY
Machine shuts off in Stick mode. 1. Welder has overheated and secondary thermostat has
opened. Allow welder to cool before attempting to turn
on. Be sure to provide adequate ventilation around
welder to prevent recurrence.
Stick electrode “blasts off” when touched 1. Weld current is set too high for electrode size. Reduce
weld
to workpiece. current.
2. Start Switch is “On”, and Start Current is set too high
for electrode size. Either turn Start Switch OFF, or
reduce Start Current.
3. Arc Force control is set too high. Turn to minimum.
Arc seems too hot, and reducing current 1. Arc Force control is set too high. Turn to minimum.
potentiometer does not help.
2. Start Switch is ON and Start Current is set too high.
Start time may be set too long. Reduce or turn Start
Switch OFF.
Machine welds at very low output, regard- 1. Current Control switch is in REMOTE. Switch to
LOCAL.
less of Current potentiometer setting.
2. Start Switch is ON, and Start Current is set too low for
the electrode size. Either turn Start Switch OFF, or set
Start Current to proper level for the electrode size.
3. Does machine have correct output in TIG mode? If not,
see “Machine welds at low output” in TIG troubleshoot-
ing section.
4. If TIG welding output is OK, Control PC board is defec-
tive. Replace.
Machine welds at very high output, regard- 1. Are the Start controls set correctly? See “Stick elec-
trode
less of Current potentiometer setting. blasts off” above.
2. Are the TIG welding outputs OK? If not, see TIG trou-
bleshooting section.
3. If TIG welding output is OK, Control PC board may be
defective. Replace.
Arc Force control has no effect. 1. The effect of the Arc Force Control will be less notice-
able at high welding currents. Weld at low current (less
than 150 amps) and check Arc Force effect.
2. If no effects are seen at low currents, the Arc Force
control potentiometer may be defective. Replace.
3. Control PC board may be defective. Replace.
Gas and water do not flow even though Gas Machine is operating properly; gas and water solenoids, as
well as
and Water LED is lit in Stick mode. the high frequency circuit, are disabled in the Stick mode.
This Troubleshooting Guide is designed to be used by the machine Owner/Operator. Unauthorized repairs performed on this equipment may result in danger to the
technician and machine operator and will invalidate your factory warranty. For your safety, please observe all safety notes and precautions detailed in the Safety
Section of this manual to avoid electrical shock or danger while troubleshooting this equipment.
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WARNING