Lincoln Electric POWER WAVE IM986 Operator's Manual page 45

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PROBLEMS
(SYMPTOMS)
Wire burns back to tip at the end of
the weld.
Machine output shuts down during
a weld.
Machine wonʼt produce full output.
Excessively long and erratic arc.
Arc loss fault on robot.
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
1. Burnback Time.
1.Inverter or System Fault
1. Input voltage may be too low,
limiting output capability of the
power source.
2. Machine calibration.
1. Wire feed problem.
2. Voltage sensing problem.
3. Loss of, or improper Shielding
Gas.
4. Machine calibration.
1. Possibly caused by wire feeding
problem.
POWER WAVE® i400
CAUSE
CAUTION
RECOMMENDED
COURSE OF ACTION
1. Reduce burnback time and/or
workpoint.
1. A non-recoverable inverter fault
will interrupt welding, and open
the main contactor. This condi-
tion will also result in an alternat-
ing red and green status light on
the control panel. See the Status
Light section for more informa-
tion.
1. Make certain that the input volt-
age is proper, according to the
Rating Plate located on the rear
of the machine.
2. Calibrate secondary current and
voltage.
1. Check for feeding problems.
Verify proper wire drive and gear
ratio has been selected.
2. Check sense lead connections.
Check the sense lead configura-
tion and arc polarity. Make sure
Electrode and Work connections
are not reversed.
3. Verify gas flow and type are cor-
rect.
4. Calibrate secondary current and
voltage.
1. Check for feeding problems.
Verify proper wire drive and gear
ratio has been selected. For
larger diameter wire, consider
the highest torque / lowest range
gear ratio available to suit the
application.
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