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| TROUBLESHOOTING & REPAIR |
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| Observe Safety Guidelines |
| TROUBLESHOOTING GUIDE | ||||||
| detailed in the beginning of this manual. |
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| PROBLEMS | POSSIBLE AREAS OF | RECOMMENDED |
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| (SYMPTOMS) | MISADJUSTMENT(S) | COURSE OF ACTION |
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| OUTPUT PROBLEMS |
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| The welding output varies abnor- | 1. Check for loose or faulty weld- | 1. Check the fine current control | ||||||
| mally. The auxiliary output remains | ing cables. |
| field rheostat for resistance and | |||||
| constant. The engine is operating | 2. This may be a normal condition. |
| proper operation. Normal resis- | |||||
| correctly. |
| tance is 64 ohms. Check asso- | ||||||
| The machine will normally lose |
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| ciated wires for loose or faulty | ||||||
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| some output as the components |
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| connections. | See | the | Wiring | |||
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| are heated. |
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| Diagram. |
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| 3. Check for loose, worn, dirty or | 2. | Perform | the | Main | Generator | ||
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| poorly seated main DC genera- | |||||||
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| Shunt Field Winding Test. | ||||||
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| tor brushes. |
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| 4. The main armature commutator | 3. | Check | the | current | range | ||
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| selector switch and contacts for | ||||||
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| may need cleaning. |
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| proper operation. |
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| 4. While the machine is loaded, | ||||||
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| check the interpole and series | |||||
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| coils for signs of “arcing.” This | |||||
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| condition would indicate short- | |||||
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| ed turns in the “arcing” coil. | |||||
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| 5. The main armature may be | ||||||
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| faulty. Check for grounds. | |||||
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CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
