| TROUBLESHOOTING | |||||
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| Observe all Safety Guidelines detailed througout this manual | |||
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| PROBLEMS | POSSIBLE | RECOMMENDED | |
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| (SYMPTOMS) | CAUSES | COURSE OF ACTION | |
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| PROBLEMS |
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1. | Machine fails to hold the heat | a. Rough or dirty commutator. | a. Commutator should be turned or | |||
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| constantly. |
| cleaned. | ||
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| b. Brushes may be worn down to | b. Replace brushes. | |
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| limit. |
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| c. Field circuit may have variable | c. Check field current with ammeter | |
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| resistance connection or intermit- | to discover varying current. This | |
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| tent open circuit due to loose, or | applies to both the main genera- | |
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| broken wire. | tor and exciter. | |
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| d. Electrode lead or work lead con- | d. Tighten all connections. | |
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| nection may be poor. |
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| e. Wrong grade of brushes may | e. Use Lincoln brushes. | |
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| have been installed on generator. |
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| f. Field rheostat may be making | f. Inspect and clean the rheostat. | |
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| poor contact and overheating. |
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2. | Welder starts but fails to generate | a. Generator or exciter brushes may | a. Be sure that all brushes bear on | |||
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| current. | be loose or missing. | the commutator and have proper | ||
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| spring tension. | |
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| b. Exciter may not be operating. | b. Check exciter output voltage with | |
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| voltmeter or lamp. | |
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| c. Field circuit of generator or | c. Check for open circuits in rheo- | |
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| exciter may be open. | stat, field leads, and field coils. | |
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| Check rectifier bridge. | |
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| d. Exciter may have lost excitation. | d. Flash fields. ** | |
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| e. Series field and armature circuit | e. Check circuit with ringer or volt- | |
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| may be | meter. | |
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3. | Welding arc is loud and spatters | a. Current setting may be too high. | a. Check setting and current output | |||
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| excessively. |
| with ammeter. | ||
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| b. Polarity may be wrong. | b. Check polarity. Try reversing | |
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| polarity or try an electrode of the | |
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| opposite polarity. | |
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CAUTION
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.
CLASSIC I
LINCOLN ®
ELECTRIC
