Lincoln Electric SAE-400 SEVERE DUTY IM727, Руководство оператора

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E-2
TROUBLESHOOTING
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.
SAE-400®
CAUTION
PROBLEM POSSIBLE CAUSE RECOMMENDED COURSE OF ACTION
Machine fails to hold the
“heat” constantly. 1. Rough or dirty commutator.
1. True and clean commutator.justment have been
checked and the problem persists, Contact your local
Lincoln Authorized Field Service Facility.
2. Brushes may be worn down to limit of life. 2. Replace brushes.
3. Brush springs may be broken. 3. Replace brush springs.
4. Field circuit may have variable resistance
connections or intermittent open circuit, due
to loose connections or broken wire.
4. Check field current with ammeter to discover varying
current. This applies to both the main generator and
exciter.
5. Electrode or work lead connections may be
poor.
5. Tighten all connections.
6. Wrong grade of brushes may be installed on
generator.
6. Use only the recommended Lincoln brushes.
7. Field rheostat may be making poor contact
and overheating.
7. Inspect and clean rheostat.
8. “Current Control” may not be operating
properly.
8. Check for loose or missing set screw in control handles.
9. “Current Control” brush holder contact
springs may be worn out or missing. Contact
surface may be dirty, rough and pitted.
9. Inspect. Replace needed parts. Clean internal contact
surface of control device. Do not lubricate. Smooth
rough surfaces.
10. “Current Control” brush holder support stud
and mating contact surfaces may be dirty or
pitted and burned.
10. If brush holder internal contact surface is pitted and
burned, replace the brush holder and support stud. If
the contact surface is dirty, clean off the brush holder
stud and internal contact surface. Apply mixture of
three parts silicone grease and one part zinc powder
(by weight) to stud.
11. Engine running at varying speeds. 11. Set welder controls for maximum output and weld.
Then, while welding, check engine rpm. The engine
should be running at full speed. If indicator shows a
significant difference, consult your engine manual.