WELDER TROUBLESHOOTING | ||
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| Observe all Safety Guidelines detailed throughout this manual |
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PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF MISADJUSTMENTS(S)
RECOMMENDED
COURSE OF ACTION
Machine fails to hold the heat | 1. Rough or dirty commutator. |
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consistently. |
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| 2. | Brushes may be worn down |
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| to limit. |
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| 3. | Field circuit may have variable |
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| resistance connection or intermit- |
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| tent open circuit due to loose |
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| connection or broken wire. |
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| 4. | Electrode lead or work lead con- |
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| nection may be poor. | If all recommended possible areas |
| 5. | Wrong grade of brushes may | of misadjustment have been |
| checked and the problem persists, | ||
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| have been installed on generator. | Contact your local Lincoln |
| 6. | Field rheostat may be making | Authorized Field Service Facility. |
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| poor contact and overheating. |
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Welder starts but fails to generate | 1. Generator or exciter brushes |
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current. |
| may be loose or missing. |
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| 2. | Exciter may not be operating. |
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| 3. | Field circuit of generator or |
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| exciter may be open. |
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| 4. | Exciter may have lost excitation. |
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| 5. | Series field and armature circuit |
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| may be |
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Welding arc is loud and spatters | 1. Current setting may be to high. |
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excessively. |
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| 2. | Polarity may be wrong. |
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Welding current too great or too | 1. Exciter output low causing low |
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small compared to indication on |
| output compared to dial indication. |
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the dial. |
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| 2. | Operating speed too low or to |
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| high. |
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Arc continuously pops out. | 1. “Current Range Selector” switch |
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| may be set at an intermediate |
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| position. |
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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.
SA 250
