Lincoln Electric AUTODRIVE 4R90 - Manual (Page 25)

E-3 TROUBLESHOOTING E-3
AutoDrive 4R90
Observe all Safety Guidelines detailed throughout this manual
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.
CAUTION
PROBLEMS
(SYMPTOMS)
POSSIBLE
CAUSE
RECOMMENDED
COURSE OF ACTION
Variable or "hunting" arc.
The motor overload errors occur.
1. Check for proper size contact.
Make sure the contact tip is not
worn, free of spatter and not melt-
ed.
2. Clean and tighten all electrode
and work connections.
3. Verify the proper polarity is being
used for the weld procedure.
4. Make sure the proper electrode
stick-out is being maintained.
5. Check the gas flow rate and mix-
ture.
6. Verify the gun bushing is tightly
mounted to the wire drive.
7. Verify the gun is tightly mounted
to the gun bushing.
8. Verify the electrode lead is con-
nected to the proper connection
block on the feed head.
9. Inspect the motor for worn brush-
es.
1. Check for sharp bends in the gun
liner and conduit.
2. Examine the contact tip for wear
and proper size. Replace as nec-
essary.
3. Check the gun liner and conduit.
The welding electrode should
slide easily through both.
4. V e ri f y t he pro p e r g u n l in e r is
installed.
5. Reduce the pressure arm setting.
Output Problems